HIGH POWER BEAM DUMP AND TARGET / ACCELERATOR INTERFACE PROCEDURES *
|
|
- Chastity Allison
- 6 years ago
- Views:
Transcription
1 HIGH POWER BEAM DUMP AND TARGET / ACCELERATOR INTERFACE PROCEDURES * J. Galambos, W. Blokland, D. Brown, C. Peters, M. Plum, Spallation Neutron Source, ORNL, Oak Ridge, TN 37831, U.S.A. Abstract Satisfying operational procedures and limits for the beam target interface is a critical concern for high power operation at spallation neutron sources. At the Oak Ridge Spallation Neutron Source (SNS) a number of protective measures are instituted to ensure that the beam position, beam size and peak intensity are within acceptable limits at the target and high power Ring Injection Dump (RID). The high power beam dump typically handles up to kw of beam power and its setup is complicated by the fact that there are two separate beam components simultaneously directed to the dump. The beam on target is typically in the kw average power level, delivered in sub- s 60 Hz pulses. Setup techniques using beam measurements to quantify the beam parameters at the target and dump will be described. However, not all the instrumentation used for the setup and initial qualification is available during high power operation. Additional techniques are used to monitor the beam during high power operation to ensure the setup conditions are maintained, and these are also described. INTRODUCTION Design, operation and maintenance of high power hadron beam targets and dumps present significant challenges [1]. As the beam power approaches the mega- Watt range, the target issues become especially severe. Typically, a high intensity secondary beam is desired favoring a small primary beam footprint, but heat removal constraints limit the minimum size of the beam. Accelerator designers prefer a peaked beam profile on target to minimize the amount of beam near the beam pipe, whereas target designers prefer as uniform a power distribution on target as possible. Pulsed beams introduce transient effects such as fatigue and cavitation, further complicating target survivability. Ultimately compromises in these various considerations are made in the design solution based on assumptions on the beam properties impingent on the target. Ensuring that the beam characteristics are within design limits is critical to ensure target integrity, and this task itself represents challenges. It is especially difficult given the harsh environment associated with high power targets and dumps. In this paper we describe the beam property requirements at the high power target and beam dump, the beam setup techniques used to qualify high power operation, and the live monitoring systems used to ensure that the beam setup is maintained during high power operations at the SNS [2,3]. We will also review the beam interface experience for the SNS Ring Injection Dump (RID), which receives up to 100 kw during operation, and with the SNS primary target. RING INJECTION DUMP Between 5-10% of the accelerated H - beam is not fully stripped in the Ring charge exchange injection process, and this waste beam is transported to the Ring Injection Dump (RID). For a 1 MW power delivered to the target, this represents up to ~100 kw delivered to this beam dump, which represents a significant challenge. Further complicating this system is the fact that there are two species of waste beam delivered to the RID: 1) beam that misses the charge exchange stripper foil (H - ) and 2) beam that hits the foil, but is only partially stripped (H 0 ). This injection process is described in Ref. [4]. The final approach to the RID is shown schematically in Fig.1, and includes 1) a region of ~9 m including beam instrumentation that is inside the tunnel (accessible), and 2) a long drift (~10.5 m) in a buried beam pipe, and 3) a vacuum window and target assembly that are accessible from above in a dedicated service building. Beam Instrumentation The beam instrumentation in the RID beam-line used for target interface related measurements includes: three Beam Position Monitors (BPMs), a wire scanner profile measurement, and two current measurement devices. The only beam instrumentation at the window/target area is a set of indirect halo temperature thermocouples mounted around the outer perimeter of the vacuum window assembly. There are no direct beam measurements at the window or dump assembly. Beam Constraints and Production Setup Primary concerns in the beam setup are preventing over-focusing of the waste beams on the vacuum window and dump, and ensuring that the waste beams are properly centered at the window and target. There is a long drift (~20 m) from the last focusing quadrupole to the beam dump, which provides a natural expansion of the waste beam sizes at the dump, which are estimated to be ~ 35 mm RMS. The final focusing quadrupole strength in this beam-line is limited, to prevent over-focusing of the beam sizes at the dump window. The waste beam sizes at the dump are not measured. * ORNL is managed by UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. Dept. of Energy.
2 The primary effort during the production beam qualification is ensuring that both waste beams intersect the target and vacuum window near the center. This beam centering is done by extrapolating the beam position measured at the three BPMs in the dump line (see Fig. 1) to the window using a simple linear transport model. The extrapolation is straightforward for the H - waste beam, since the centering is performed with the primary stripper foil extracted, guaranteeing a 100% H - beam. For the H 0 waste beam, we simulate the H 0 trajectory by appropriate adjustment of the intervening dipole magnet fields, before it is completely stripped by a large/thick secondary foil. There is some uncertainty associated with this part of the setup, estimated to translate to a few mm in the beam position at the window. If the measured beam positions at the window are > 30 mm from the center, adjustments are made with steering elements, until this criterion is satisfied. Tunnel end ~ 10 m dri Dump Quad BPMs, Wire scanner, Current monitor Figure 1: Schematic layout of the Ring Injection Dump beam-line geometry. Several modifications to the injection dump have improved this setup process. A horizontal bending C- magnet that primarily affects the H - waste beam (the magnet is located at a point of maximal waste beam separation) was added, to provide an independent horizontal steering control. Initially, the beam position measurements in the dump line involved use of a wire scanner profile measurement. This was quite slow, and resulted in the waste beam setup being quite tedious. Two BPMs were added to bring the total to three in the drift region, and now the wire scanner is no longer used for beam centering. A real time phosphor screen imaging system for the dump vacuum window providing direct position and size measurement is under consideration, but this effort has not started. Post Power Ramp-up The above described setup process is typically done with a low intensity (few s) 1 Hz tuning beam. Not until the beam power is increased, do the dump window thermocouples begin to show a response to any impingent beam. The restrictions imposed on the beam centering described above do not necessarily result in a low beam loss tune in the dump line, but do ensure the waste beams start near the window center. The initial (immediately after production setup) waste beam coordinates are shown in Figure 2a, for several setup configurations in the period. After the full beam power is reached, it is normal to perform tune up adjustments for reasons including beam loss reduction, or reducing foil flutter. This tuning involves steering that affects the waste beam trajectories. During tuning, the thermocouple levels at the injection dump window are restricted as indicated in Table 1. This process ensures that the waste beams start nearly centered, and any post ramp-up steering that results in the waste beams approaching the edge of the window will be limited from too close an approach by the near complete coverage of thermocouples. If either waste beam does approach the window edge, the halo thermocouple temperature response quickly rises, and appropriate limits are placed on these temperatures. Figure 2b shows the waste beam center measured positions after the end of the same production runs shown in Figure 2a. There is considerable deviation in the post production waste beam horizontal positions relative to the initial setup. This deviation is a result of the above mentioned tuning that occurs during production. Controls There are multiple layers of controls in place during operations to ensure that the design parameters of the beam dump are not violated, as summarized in Table 1. There are three levels of enforcement, should a monitored quantity exceed a limit: 1) alarm, 2) software trip, and 3) hardware trip. Alarm limits cause an audible alarm, but do not stop beam. These are useful for advance notice of a slow drift (seconds to minutes) towards an unsafe condition, allowing for operator correction. Alarm limits are typically implemented with a larger margin than any trip limit. Software trips inhibit the beam by stopping the beam permit in the timing system, but typically do not turn off equipment to ensure that the beam is off. These trip limits have an intermediate margin from the operational limit, and are usually programmed to run on a control system input-output computer (IOC), with
3 reaction times of ms. Finally the most severe and most reliable protective measure implements a hardware trip, which is typically enforced by a PLC circuit, sometimes accompanied by forced shutdown of equipment required to accelerate beam. a) b) Ini al Setup 80 H 60 H X (mm) Y (mm) Post Produc on 80 H 60 H X (mm) Figure 2: RID Waste beam centroids, a) before production start, and b) and after the end of a 1 month production run. Y (mm) Table 1: Summary of Injection Dump run time protective measures Limit Type Halo thermocouples < 55 C Software Halo thermocouples < 65 C Quadrupole / Dipoles < 10% from nominal Power < input limit Software + Beam current < 100 ma (instantaneous) Beam current < 15 ma (over 100 s) Beam current < 3 ma (over 1 ms) Beam current < 0.1 ma (over 1 s) Loss monitors + calculated using current monitor input BEAM ON TARGET and software Controlling the beam on target is also a critical concern [2,3]. Primary control requirements are shown in Table 2, which ensure limiting the peak intensity on the target to < 1.72x10 16 protons/m 2, limiting the peak time averaged current density (over 10 sec) < 0.17A/m 2, 90% of the power within the nominal spot size of 200 mm horizontal and 70 mm vertical, and keeping the beam centered on the target center. Beam Instrumentation Beam instrumentation in the beam-line approaching the target is discussed in [Plum 2005]. Instrumentation directly involved in the beam production setup and production monitoring includes 11 BPMs, 4 wire scanner beam profile measurement devices, one beam current monitor, 1 Harp profile monitor (9.52 m from the target), halo thermocouple instrumentation on at the beam window 2.14 m upstream from the target and a Target Imaging System (TIS) that utilizes a phosphor coating directly on the target [5,6]. Also, there are 33 BLMs in the transport line to the Target, as indicated in Figure 3. Beam Constraints and Production Setup The primary exercise in setting up the production beam on target is ensuring that the peak beam intensity, the beam size and the beam center on the target are acceptable. First, the beam size and profile on the target are determined indirectly. RMS beam sizes are measured at the 5 profile measurement locations directly ( m) upstream of the target. An envelope beam model is used to match the measured beam sizes and extrapolate the beam size to the target. The beam profiles at the Harp are assumed to be the same on the target, with only the RMS sizes changed as per model extrapolation. This information, along with the measured beam current, provides the peak beam density, and beam sizes on the target. The beam center at the target is provided by extrapolation (using the same envelop model) of the measured positions at the BPMs through the lattice to the target, and is also available directly through the TIS. We used the BPM method for initial beam setup until early 2011, after which the TIS beam center measurement was adopted. The BPM extrapolation method differs from the TIS beam center measurement by about -8 mm horizontal and -2 mm vertical.
4 Figure 3: Layout of the beam-line approach to the Target. Table 2: Summary of Target run time protective measures. Limit Type Harp beam size within 10% of setup Alarm Harp peak intensity < 110% of setup Alarm TIS within 6 (4) mm center horizontal Alarm (vertical) Halo thermocouples < o C Alarm ++ Halo thermocouples < 450 o C Quadrupoles within 3.5% nominal Dipoles within 0.5 A setup Last 4 dipole correctors within 0.5 A setup Power < prescribed limit depending on Software run conditions Vertical position offset < 4mm Software + Horizontal position offset < 6 mm Horizontal (vertical) beam size < 49 (17) Software cm Ring injection and extraction kicker Software * waveform monitors Loss monitors and software + This is also indirectly enforced with the waveform monitors ++ limit varies by thermocouple based on experience * Being converted to hardware The TIS also provides direct profile information, but profile interpretation is complicated by non-uniform degradation of phosphor emission with time, possible phosphor light induced from the intense radiation produced in the target and the complicated optical system used to gather the image. Because of these concerns the TIS is not presently used to control the beam size and intensity. We have compared the beam sizes on target from the extrapolation and TIS methods, and we typically see differences up to ~40%. But these differences are not always the same between setups, and they are not well understood. Controls methods employed during production operation to protect the target, and ensure the limits discussed above are respected, are summarized in Table 2. Production Stability of Beam Parameters After the initial beam characterization on target, the power is ramped up. To ensure that the beam position stays centered, we also monitor the Ring injection and extraction pulsed kicker magnet current waveforms to ensure they are within prescribed tolerances of the nominal levels. This is critical because it is possible for just one of the 13 extraction kickers to vary in amplitude or time, and cause the beam position to deviate beyond allowable limits, without causing the beam loss to increase above the trip limits. This situation was determined empirically. Until February 2011 beam centering on the target, after power ramp-up, was ensured by maintaining balanced halo thermocouple temperature measurements at the beam window just upstream of the target. Once the beam power reached a few hundred kw, operators would steer the beam to ensure left-right and up-down balanced halo monitor temperature readings. This process assumed symmetric halo profiles and that the center of the thermocouple array is the same as the center of the target. After Feb. 2011, the TIS became the primary diagnostic for beam centering, and asymmetric halo temperatures were accepted, but the thermocouple temperatures are limited to a value based on calculations for a safe amount
5 of beam impingent at the outer radius of the window. Figure 3a shows the history of the difference in the target window halo thermocouple differences (left-right and updown). After February 2011, there is an increase in the vertical asymmetry. Fig. 3b shows the beam center reported by the TIS, with a corresponding reduction in the beam position after February We note that the typical fluctuation of the beam position on the target over month long production runs is typically < 1-2 mm. a) b) Figure 2: a) Temperature asymmetry at the target beam window, and b) beam center measured by the TIS Figure 3: Long term beam size measurement at the Harp upstream of the target. Another quantity of interest is the beam size on target. As mentioned above, the nominal method for this determination is by propagating measured beam sizes downstream to the target. The only active upstream beam profile measurement during operations is the Harp 9.5 m from the target. Figure 3 shows long-term stability of the beam size measured at the Harp. The discontinuity at the end of 2010 is due to the adoption of new beam-line lattice optics between the Harp and the target (beam size on the target did not change). The beam size stability is typically < 1-2 mm over the course of a one-month production run. Also we monitor the integrated beam flux on the vacuum windows in the RID and target beam lines and for the targets, to compute radiation damage effects (e.g. DPA). This information is used for lifetime / replacement schedule purposes. SUMMARY Ensuring proper control of the beam parameters on high intensity beam dumps and targets is a critical concern. The methods employed at the SNS to ensure beam on target control and the typical beam on target stability are summarized. Some issues have arisen that were not anticipated during design. These include implications of operator tuning to optimize the operational setup after the production has been initially qualified. Also, multiple instrumentation methods can give differing indications of the beam parameters on target. REFERENCES [1] P. Hurh, et al., Targetry Challenges at Megawatt Proton Accelerator Facilities, THPFI083, Proceedings of the 4 th International Particle Accelerator Conference p (2013); apers/thpfi082.pdf. [2] M. Plum, M. Holding, T. McManamy, Beam Parameter Measurement and Control at the SNS Target, Proceedings of 2005 Particle Accelerator Conference, Knoxville, Tennessee, p (2005); pae074.pdf [3] S. Henderson et al., Exploration of Beam Fault Scenarios for the SNS, Proceedings of the 2003 Particle Accelerator Conference, p (2003); /TPPE012.PDF [4] M. Plum, SNS Injection and Extraction Systems Issues and Solutions, Proceedings of Hadron Beam 2008, Nashville, Tennessee, USA, p , ers/wgc04.pdf. [5] T. Shea et al., Status of Beam Imaging Developments for the SNS Target, Proceedings of DIPAC09, Basel, Switzerland, p , (2009), ooc04.pdf [6] W. Blokland et al., SNS Target Imaging System Software and Analysis, Proceedings of BIW10, Santa Fe, NM, US, p , pers/tupsm003.pdf
OPERATIONAL EXPERIENCE AT J-PARC
OPERATIONAL EXPERIENCE AT J-PARC Hideaki Hotchi, ) for J-PARC commissioning team ), 2), ) Japan Atomic Energy Agency (JAEA), Tokai, Naka, Ibaraki, 39-95 Japan, 2) High Energy Accelerator Research Organization
More informationHall-B Beamline Commissioning Plan for CLAS12
Hall-B Beamline Commissioning Plan for CLAS12 Version 1.5 S. Stepanyan December 19, 2017 1 Introduction The beamline for CLAS12 utilizes the existing Hall-B beamline setup with a few modifications and
More informationFINAL DESIGN OF ILC RTML EXTRACTION LINE FOR SINGLE STAGE BUNCH COMPRESSOR
BNL-94942-2011-CP FINAL DESIGN OF ILC RTML EXTRACTION LINE FOR SINGLE STAGE BUNCH COMPRESSOR S. Sletskiy and N. Solyak Presented at the 2011 Particle Accelerator Conference (PAC 11) New York, NY March
More informationCOMMISSIONING SCENARIOS FOR THE J-PARC ACCELERATOR COMPLEX
COMMISSIONING SCENARIOS FOR THE J-PARC ACCELERATOR COMPLEX T. Koseki, M. Ikegami, M. Tomizawa, Accelerator Laboratory, KEK, Tsukuba, Japan F. Noda, JAEA, Tokai, Japan Abstract The J-PARC (Japan Proton
More informationRequirements for the Beam Abort Magnet and Dump
Requirements for the Beam Abort Magnet and Dump A beam abort kicker (pulsed dipole magnet) and dump are required upbeam of the LCLS undulator in order to protect the undulator from mis-steered and poor
More informationThe PEFP 20-MeV Proton Linear Accelerator
Journal of the Korean Physical Society, Vol. 52, No. 3, March 2008, pp. 721726 Review Articles The PEFP 20-MeV Proton Linear Accelerator Y. S. Cho, H. J. Kwon, J. H. Jang, H. S. Kim, K. T. Seol, D. I.
More informationOak Ridge Spallation Neutron Source Proton Power Upgrade Project and Second Target Station Project
Oak Ridge Spallation Neutron Source Proton Power Upgrade Project and Second Target Station Project Workshop on the future and next generation capabilities of accelerator driven neutron and muon sources
More informationA HIGH POWER LONG PULSE HIGH EFFICIENCY MULTI BEAM KLYSTRON
A HIGH POWER LONG PULSE HIGH EFFICIENCY MULTI BEAM KLYSTRON A.Beunas and G. Faillon Thales Electron Devices, Vélizy, France S. Choroba DESY, Hamburg, Germany Abstract THALES ELECTRON DEVICES has developed
More informationLinac 4 Instrumentation K.Hanke CERN
Linac 4 Instrumentation K.Hanke CERN CERN Linac 4 PS2 (2016?) SPL (2015?) Linac4 (2012) Linac4 will first inject into the PSB and then can be the first element of a new LHC injector chain. It will increase
More informationNew Filling Pattern for SLS-FEMTO
SLS-TME-TA-2009-0317 July 14, 2009 New Filling Pattern for SLS-FEMTO Natalia Prado de Abreu, Paul Beaud, Gerhard Ingold and Andreas Streun Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland A new
More informationBeam Loss Detection for MPS at FRIB
Beam Loss Detection for MPS at FRIB Zhengzheng Liu Beam Diagnostics Physicist This material is based upon work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661.
More informationPRESENT STATUS OF J-PARC
PRESENT STATUS OF J-PARC # F. Naito, KEK, Tsukuba, Japan Abstract Japan Proton Accelerator Research Complex (J-PARC) is the scientific facility with the high-intensity proton accelerator aiming to realize
More informationA Fifteen Year Perspective on the Design and Performance of the SNS Accelerator
A Fifteen Year Perspective on the Design and Performance of the SNS Accelerator S. Cousineau (On behalf of the SNS project) HB2016, Sweden July 04, 2016 ORNL is managed by UT-Battelle for the US Department
More information1. General principles for injection of beam into the LHC
LHC Project Note 287 2002-03-01 Jorg.Wenninger@cern.ch LHC Injection Scenarios Author(s) / Div-Group: R. Schmidt / AC, J. Wenninger / SL-OP Keywords: injection, interlocks, operation, protection Summary
More informationCOMMISSIONING AND FIRST RESULTS OF THE ELECTRON BEAM PROFILER IN THE MAIN INJECTOR AT FERMILAB*
FERMILAB-CONF-17-68-AD COMMISSIONING AND FIRST RESULTS OF THE ELECTRON BEAM PROFILER IN THE MAIN INJECTOR AT FERMILAB* R. Thurman-Keup, M. Alvarez, J. Fitzgerald, C. Lundberg, P. Prieto, J. Zagel, FNAL,
More informationINSTALLATION STATUS OF THE ELECTRON BEAM PROFILER FOR THE FERMILAB MAIN INJECTOR*
TUPB77 INSTALLATION STATUS OF THE ELECTRON BEAM PROFILER FOR THE FERMILAB MAIN INJECTOR* R. Thurman-Keup #, M. Alvarez, J. Fitzgerald, C. Lundberg, P. Prieto, M. Roberts, J. Zagel, FNAL, Batavia, IL 651,
More informationEPJ Web of Conferences 95,
EPJ Web of Conferences 95, 04012 (2015) DOI: 10.1051/ epjconf/ 20159504012 C Owned by the authors, published by EDP Sciences, 2015 The ELENA (Extra Low Energy Antiproton) project is a small size (30.4
More informationMechanical aspects, FEA validation and geometry optimization
RF Fingers for the new ESRF-EBS EBS storage ring The ESRF-EBS storage ring features new vacuum chamber profiles with reduced aperture. RF fingers are a key component to ensure good vacuum conditions and
More informationSTATUS OF THE SWISSFEL C-BAND LINEAR ACCELERATOR
Proceedings of FEL213, New York, NY, USA STATUS OF THE SWISSFEL C-BAND LINEAR ACCELERATOR F. Loehl, J. Alex, H. Blumer, M. Bopp, H. Braun, A. Citterio, U. Ellenberger, H. Fitze, H. Joehri, T. Kleeb, L.
More informationOPERATIONAL EXPERIENCE WITH CIRCULATING BEAM
OPERATIONAL EXPERIENCE WITH CIRCULATING BEAM S. Redaelli on behalf of the LHC beam commissioning team CERN, Geneva, Switzerland Abstract Following various injection tests, the full LHC beam commissioning
More informationCommissioning of Accelerators. Dr. Marc Munoz (with the help of R. Miyamoto, C. Plostinar and M. Eshraqi)
Commissioning of Accelerators Dr. Marc Munoz (with the help of R. Miyamoto, C. Plostinar and M. Eshraqi) www.europeanspallationsource.se 6 July, 2017 Contents General points Definition of Commissioning
More informationTutorial: Trak design of an electron injector for a coupled-cavity linear accelerator
Tutorial: Trak design of an electron injector for a coupled-cavity linear accelerator Stanley Humphries, Copyright 2012 Field Precision PO Box 13595, Albuquerque, NM 87192 U.S.A. Telephone: +1-505-220-3975
More informationTHE NEW LASER FAMILY FOR FINE WELDING FROM FIBER LASERS TO PULSED YAG LASERS
FOCUS ON FINE SOLUTIONS THE NEW LASER FAMILY FOR FINE WELDING FROM FIBER LASERS TO PULSED YAG LASERS Welding lasers from ROFIN ROFIN s laser sources for welding satisfy all criteria for the optimized laser
More informationDevelopment of Multiple Beam Guns for High Power RF Sources for Accelerators and Colliders
SLAC-PUB-10704 Development of Multiple Beam Guns for High Power RF Sources for Accelerators and Colliders R. Lawrence Ives*, George Miram*, Anatoly Krasnykh @, Valentin Ivanov @, David Marsden*, Max Mizuhara*,
More informationWorkshop on Accelerator Operations August 6-10, 2012 Glen D. Johns Accelerator Operations Manager
HWDB: Operations at the Spallation Neutron Source Workshop on Accelerator Operations August 6-10, 2012 Glen D. Johns Accelerator Operations Manager Outline Facility overview Organization Shift schedule
More informationThe ESS Accelerator. For Norwegian Industry and Research. Oslo, 24 Sept Håkan Danared Deputy Head Accelerator Division Group Leader Beam Physics
The ESS Accelerator For Norwegian Industry and Research Oslo, 24 Sept 2013 Håkan Danared Deputy Head Accelerator Division Group Leader Beam Physics The Hadron Intensity Frontier Courtesy of M. Seidel (PSI)
More informationAdvanced Photon Source - Upgrades and Improvements
Advanced Photon Source - Upgrades and Improvements Horst W. Friedsam, Jaromir M. Penicka Argonne National Laboratory, Argonne, Illinois, USA 1. INTRODUCTION The APS has been operational since 1995. Recently
More informationDevelopment of beam-collision feedback systems for future lepton colliders. John Adams Institute for Accelerator Science, Oxford University
Development of beam-collision feedback systems for future lepton colliders P.N. Burrows 1 John Adams Institute for Accelerator Science, Oxford University Denys Wilkinson Building, Keble Rd, Oxford, OX1
More informationDesign Studies For The LCLS 120 Hz RF Gun Injector
BNL-67922 Informal Report LCLS-TN-01-3 Design Studies For The LCLS 120 Hz RF Gun Injector X.J. Wang, M. Babzien, I. Ben-Zvi, X.Y. Chang, S. Pjerov, and M. Woodle National Synchrotron Light Source Brookhaven
More informationDESIGN AND PERFORMANCE OF L-BAND AND S-BAND MULTI BEAM KLYSTRONS
DESIGN AND PERFORMANCE OF L-BAND AND S-BAND MULTI BEAM KLYSTRONS Y. H. Chin, KEK, Tsukuba, Japan. Abstract Recently, there has been a rising international interest in multi-beam klystrons (MBK) in the
More informationDevelopment of an Abort Gap Monitor for High-Energy Proton Rings *
Development of an Abort Gap Monitor for High-Energy Proton Rings * J.-F. Beche, J. Byrd, S. De Santis, P. Denes, M. Placidi, W. Turner, M. Zolotorev Lawrence Berkeley National Laboratory, Berkeley, USA
More informationFIRST SIMULTANEOUS TOP-UP OPERATION OF THREE DIFFERENT RINGS IN KEK INJECTOR LINAC
FIRST SIMULTANEOUS TOP-UP OPERATION OF THREE DIFFERENT RINGS IN KEK INJECTOR LINAC M. Satoh #, for the IUC * Accelerator Laboratory, High Energy Accelerator Research Organization (KEK) 1-1 Oho, Tsukuba,
More information2008 JINST 3 S LHC Machine THE CERN LARGE HADRON COLLIDER: ACCELERATOR AND EXPERIMENTS. Lyndon Evans 1 and Philip Bryant (editors) 2
PUBLISHED BY INSTITUTE OF PHYSICS PUBLISHING AND SISSA RECEIVED: January 14, 2007 REVISED: June 3, 2008 ACCEPTED: June 23, 2008 PUBLISHED: August 14, 2008 THE CERN LARGE HADRON COLLIDER: ACCELERATOR AND
More informationA Facility for Accelerator Physics and Test Beam Experiments
A Facility for Accelerator Physics and Test Beam Experiments U.S. Department of Energy Review Roger Erickson for the FACET Design Team February 20, 2008 SLAC Overview with FACET FACET consists of four
More informationANKA RF System - Upgrade Strategies
ANKA RF System - Upgrade Strategies Vitali Judin ANKA Synchrotron Radiation Facility 2014-09 - 17 KIT University of the State Baden-Wuerttemberg and National Laboratory of the Helmholtz Association www.kit.edu
More informationNew Results on the Electron Cloud at the Los Alamos PSR
New Results on the Electron Cloud at the Los Alamos PSR Robert Macek, LANL, 4/15/02 Co-authors: A. Browman, D. Fitzgerald, R. McCrady, T. Spickermann, & T. S. Wang - LANL For more information see the website
More informationSPEAR 3: Operations Update and Impact of Top-Off Injection
SPEAR 3: Operations Update and Impact of Top-Off Injection R. Hettel for the SSRL ASD 2005 SSRL Users Meeting October 18, 2005 SPEAR 3 Operations Update and Development Plans Highlights of 2005 SPEAR 3
More informationDetailed Design Report
Detailed Design Report Chapter 4 MAX IV Injector 4.6. Acceleration MAX IV Facility CHAPTER 4.6. ACCELERATION 1(10) 4.6. Acceleration 4.6. Acceleration...2 4.6.1. RF Units... 2 4.6.2. Accelerator Units...
More informationCharacterizing Transverse Beam Dynamics at the APS Storage Ring Using a Dual-Sweep Streak Camera
Characterizing Transverse Beam Dynamics at the APS Storage Ring Using a Dual-Sweep Streak Camera Bingxin Yang, Alex H. Lumpkin, Katherine Harkay, Louis Emery, Michael Borland, and Frank Lenkszus Advanced
More informationTolerances on Magnetic Misalignments in SESAME Storage Ring
Tolerances on Magnetic Misalignments in SESAME Storage Ring SES-TE-AP-TN-0003 April 20, 2014 Authored by: Reviewed by: Approved by: Access List : Maher Attal Erhard Huttle Erhard Huttle ---Internal ---------
More informationExperimental Results of the Active Deflection of a Beam from a Kicker System
UCRL-JC-130430 Preprint Experimental Results of the Active Deflection of a Beam from a Kicker System Y. J. Chen G. Caporaso J. Weir This paper was prepared for submittal to 19th International Linear Accelerator
More informationPEP-I1 RF Feedback System Simulation
SLAC-PUB-10378 PEP-I1 RF Feedback System Simulation Richard Tighe SLAC A model containing the fundamental impedance of the PEP- = I1 cavity along with the longitudinal beam dynamics and feedback system
More informationA Cathode Development Cornell Cultera This scope includes all labor and purchases required produce photocathodes required by CBETA.
A1.01 PROJECT MANAGEMENT BNL/Cornell Michnoff A1.01.01 Milestones BNL/Cornell Michnoff This scope is a placeholder for all project high level milestones for NYSERDA. There is no cost or labor related to
More informationDigital BPMs and Orbit Feedback Systems
Digital BPMs and Orbit Feedback Systems, M. Böge, M. Dehler, B. Keil, P. Pollet, V. Schlott Outline stability requirements at SLS storage ring digital beam position monitors (DBPM) SLS global fast orbit
More informationThe Elettra Storage Ring and Top-Up Operation
The Elettra Storage Ring and Top-Up Operation Emanuel Karantzoulis Past and Present Configurations 1994-2007 From 2008 5000 hours /year to the users 2010: Operations transition year Decay mode, 2 GeV (340mA)
More informationCOMMISSIONING OF THE ALBA FAST ORBIT FEEDBACK SYSTEM
COMMISSIONING OF THE ALBA FAST ORBIT FEEDBACK SYSTEM A. Olmos, J. Moldes, R. Petrocelli, Z. Martí, D. Yepez, S. Blanch, X. Serra, G. Cuni, S. Rubio, ALBA-CELLS, Barcelona, Spain Abstract The ALBA Fast
More informationBeam instrumentation at the 1-MW proton J-PARC RCS
Beam instrumentation at the 1-MW proton J-PARC RCS HB2014 54th ICFA Advanced Beam Dynamics Workshop on High-Intensity, High-Brightness and High Power Hadron Beams East Lansing, MI Nov.12, 2014 Kazami Yamamoto
More informationEquipment Installation, Planning, Layout, organisation and updates
Equipment Installation, Planning, Layout, organisation and updates Simon Mataguez, Julie Coupard with contributions of the LIU-PLI team Table of contents: LIU installation activities Organisation of the
More informationPulsed Klystrons for Next Generation Neutron Sources Edward L. Eisen - CPI, Inc. Palo Alto, CA, USA
Pulsed Klystrons for Next Generation Neutron Sources Edward L. Eisen - CPI, Inc. Palo Alto, CA, USA Abstract The U.S. Department of Energy (DOE) Office of Science has funded the construction of a new accelerator-based
More informationLEP OPERATION AND PERFORMANCE WITH ELECTRON-POSITRON COLLISIONS AT 209 GEV
LEP OPERATION AND PERFORMANCE WITH ELECTRON-POSITRON COLLISIONS AT 29 GEV R. W. Aßmann, CERN, Geneva, Switzerland Abstract The Large Electron-Positron Collider (LEP) at CERN completed its operation in
More informationPEP II Design Outline
PEP II Design Outline Balša Terzić Jefferson Lab Collider Review Retreat, February 24, 2010 Outline General Information Parameter list (and evolution), initial design, upgrades Collider Ring Layout, insertions,
More informationElectron Bypass Line (EBL) Design Electrons to A-line bypassing LCLS T. Fieguth, R. Arnold
September 2007 SLAC-TN-08-001 Electron Bypass Line (EBL) Design Electrons to A-line bypassing LCLS T. Fieguth, R. Arnold Introduction Forty one years ago, September 20, 1966, the first beam entered End
More informationAn Operational Diagnostic Complement for Positrons at CEBAF/JLab
An Operational Diagnostic Complement for Positrons at CEBAF/JLab Michael Tiefenback JLab, CASA International Workshop on Physics with Positrons at Jefferson Lab 12-15 September 2017 Operating CEBAF with
More informationSTATUS OF THE SwissFEL C-BAND LINAC
STATUS OF THE SwissFEL C-BAND LINAC F. Loehl, J. Alex, H. Blumer, M. Bopp, H. Braun, A. Citterio, U. Ellenberger, H. Fitze, H. Joehri, T. Kleeb, L. Paly, J.-Y. Raguin, L. Schulz, R. Zennaro, C. Zumbach,
More informationFailure Modes, Effects and Diagnostic Analysis
Failure Modes, Effects and Diagnostic Analysis Project: United Electric One Series Electronic Switch Customer: United Electric Watertown, MA USA Contract No.: UE 05/10-35 Report No.: UE 05/10-35 R001 Version
More informationTITLE PAGE. Title of paper: PUSH-PULL FEL, A NEW ERL CONCEPT Author: Andrew Hutton. Author Affiliation: Jefferson Lab. Requested Proceedings:
TITLE PAGE Title of paper: PUSH-PULL FEL, A NEW ERL CONCEPT Author: Andrew Hutton Author Affiliation: Jefferson Lab Requested Proceedings: Unique Session ID: Classification Codes: Keywords: Energy Recovery,
More informationBEAM DIAGNOSTICS IN THE CNAO INJECTION LINES COMMISSIONING
BEAM DIAGNOSTICS IN THE CNAO INJECTION LINES COMMISSIONING A. Parravicini, G. Balbinot, J. Bosser, E. Bressi, M. Caldara, L. Lanzavecchia, M. Pullia, M. Spairani, CNAO Foundation, Pavia, Italy C. Biscari,
More informationSNS Target Imaging and Related Developments
SNS Target Imaging and Related Developments Tom Shea (ORNL) ESS Seminar Lund, Sweden January 28, 2011 T. J. Shea, T. McManamy, G. Bancke, W. Blokland, A. Brunson, M. Dayton, R. Fiorito, K. C. Goetz, J.
More informationDevelopment of BPM Electronics at the JLAB FEL
Development of BPM Electronics at the JLAB FEL D. Sexton, P. Evtushenko, K. Jordan, J. Yan, S. Dutton, W. Moore, R. Evans, J. Coleman Thomas Jefferson National Accelerator Facility, Free Electron Laser
More informationThe Syscal family of resistivity meters. Designed for the surveys you do.
The Syscal family of resistivity meters. Designed for the surveys you do. Resistivity meters may conveniently be broken down into several categories according to their capabilities and applications. The
More informationProton Engineering Frontier Project
Proton Engineering Frontier Project OECD Nuclear Energy Agency Fifth International Workshop on the Utilisation and Reliability of High Power Proton Accelerators (HPPA5) (6-9 May 2007, Mol, Belgium) Yong-Sub
More informationAn Overview of Beam Diagnostic and Control Systems for AREAL Linac
An Overview of Beam Diagnostic and Control Systems for AREAL Linac Presenter G. Amatuni Ultrafast Beams and Applications 04-07 July 2017, CANDLE, Armenia Contents: 1. Current status of existing diagnostic
More informationCOMMISSIONING RESULTS OF BEAM DIAGNOSTICS FOR THE PETRA III LIGHT SOURCE
Proceedings of DIPAC9, Basel, Switzerland MOOB2 COMMISSIONING RESULTS OF BEAM DIAGNOSTICS FOR THE PETRA III LIGHT SOURCE K. Balewski #, G. Kube, K. Wittenburg, A. Brenger, H.-T. Duhme, V. Gharibyan, J.
More information30 GHz Power Production / Beam Line
30 GHz Power Production / Beam Line Motivation & Requirements Layout Power mode operation vs. nominal parameters Beam optics Achieved performance Problems Beam phase switch for 30 GHz pulse compression
More informationWHAT WE WILL DO FOR BEAM PREPARATION IN 2009 : BEAM INTERLOCKS
WHAT WE WILL DO FOR BEAM PREPARATION IN 2009 : BEAM INTERLOCKS J. Wenninger, CERN, Geneva Abstract A large fraction of the LHC Machine Protection System was commissioned in 2008 in view of the first LHC
More informationThe Construction Status of CSNS Linac
The Construction Status of CSNS Linac Sheng Wang Dongguan branch, Institute of High Energy Physics, CAS Sep.2, 2014, Geneva Outline The introduction to CSNS accelerators The commissoning of ion source
More informationBEAM DYNAMICS AND EXPERIMENT OF CPHS LINAC *
BEAM DYNAMICS AND EXPERIMENT OF CPHS LINAC * L. Du #, C.T. Du, X.L. Guan, C.X. Tang, R. Tang, X.W. Wang, Q.Z. Xing, S.X. Zheng, Key Laboratory of Particle & Radiation Imaging (Tsinghua University), Ministry
More informationPRACTICAL APPLICATION OF THE PHASED-ARRAY TECHNOLOGY WITH PAINT-BRUSH EVALUATION FOR SEAMLESS-TUBE TESTING
PRACTICAL APPLICATION OF THE PHASED-ARRAY TECHNOLOGY WITH PAINT-BRUSH EVALUATION FOR SEAMLESS-TUBE TESTING R.H. Pawelletz, E. Eufrasio, Vallourec & Mannesmann do Brazil, Belo Horizonte, Brazil; B. M. Bisiaux,
More informationP. Emma, et al. LCLS Operations Lectures
P. Emma, et al. LCLS Operations Lectures LCLS 1 LCLS Accelerator Schematic 6 MeV 135 MeV 250 MeV σ z 0.83 mm σ z 0.83 mm σ z 0.19 mm σ δ 0.05 % σ δ 0.10 % σ δ 1.6 % Linac-0 L =6 m rf gun L0-a,b Linac-1
More informationLHC Beam Instrumentation Further Discussion
LHC Beam Instrumentation Further Discussion LHC Machine Advisory Committee 9 th December 2005 Rhodri Jones (CERN AB/BDI) Possible Discussion Topics Open Questions Tune measurement base band tune & 50Hz
More informationTop-Up Experience at SPEAR3
Top-Up Experience at SPEAR3 Contents SPEAR 3 and the injector Top-up requirements Hardware systems and modifications Safety systems & injected beam tracking Interlocks & Diagnostics SPEAR3 Accelerator
More informationPOLARIZED LIGHT SOURCES FOR PHOTOCATHODE ELECTRON GUNS AT SLAC?
SLAC-PUB-5965 December 1992 (4 POLARIZED LIGHT SOURCES FOR PHOTOCATHODE ELECTRON GUNS AT SLAC? M. Woods,O J. Frisch, K. Witte, M. Zolotorev Stanford Linear Accelerator Center Stanford University, Stanford,
More informationTWO BUNCHES WITH NS-SEPARATION WITH LCLS*
TWO BUNCHES WITH NS-SEPARATION WITH LCLS* F.-J. Decker, S. Gilevich, Z. Huang, H. Loos, A. Marinelli, C.A. Stan, J.L. Turner, Z. van Hoover, S. Vetter, SLAC, Menlo Park, CA 94025, USA Abstract The Linac
More informationLHC_MD292: TCDQ-TCT retraction and losses during asynchronous beam dump
2016-01-07 Chiara.Bracco@cern.ch LHC_MD292: TCDQ-TCT retraction and losses during asynchronous beam dump C. Bracco,R. Bruce and E. Quaranta CERN, Geneva, Switzerland Keywords: asynchronous dump, abort
More informationINSTRUMENT CATHODE-RAY TUBE
Instrument cathode-ray tube D14-363GY/123 INSTRUMENT CATHODE-RAY TUBE mono accelerator 14 cm diagonal rectangular flat face internal graticule low power quick heating cathode high brightness, long-life
More information4.4 Injector Linear Accelerator
4.4 Injector Linear Accelerator 100 MeV S-band linear accelerator based on the components already built for the S-Band Linear Collider Test Facility at DESY [1, 2] will be used as an injector for the CANDLE
More informationScreen investigations for low energetic electron beams at PITZ
1 Screen investigations for low energetic electron beams at PITZ S. Rimjaem, J. Bähr, H.J. Grabosch, M. Groß Contents Review of PITZ setup Screens and beam profile monitors at PITZ Test results Summary
More informationThe basic parameters of the pre-injector are listed in the Table below. 100 MeV
3.3 The Pre-injector The high design brightness of the SLS requires very high phase space density of the stored electrons, leading to a comparatively short lifetime of the beam in the storage ring. This,
More informationFull Disclosure Monitoring
Full Disclosure Monitoring Power Quality Application Note Full Disclosure monitoring is the ability to measure all aspects of power quality, on every voltage cycle, and record them in appropriate detail
More information2 Work Package and Work Unit descriptions. 2.8 WP8: RF Systems (R. Ruber, Uppsala)
2 Work Package and Work Unit descriptions 2.8 WP8: RF Systems (R. Ruber, Uppsala) The RF systems work package (WP) addresses the design and development of the RF power generation, control and distribution
More informationAREAL- Phase 1. B. Grigoryan on behalf of AREAL team
AREAL- Phase 1 Progress & Status B. Grigoryan on behalf of AREAL team Contents Machine Layout Building & Infrastructure Laser System RF System Vacuum System Cooling System Control System Beam Diagnostics
More informationFocus of efforts. ILC 2010, Mar/27/10 A. Seryi, BDS: 2
Beam Delivery System Updates Andrei Seryi for BDS design and ATF2 commissioning teams LCWS 2010 / ILC 2010 March 28, 2010 Plan of the program at ILC2010 Focus of efforts Work on parameter set for a possible
More informationLCLS RF Reference and Control R. Akre Last Update Sector 0 RF and Timing Systems
LCLS RF Reference and Control R. Akre Last Update 5-19-04 Sector 0 RF and Timing Systems The reference system for the RF and timing starts at the 476MHz Master Oscillator, figure 1. Figure 1. Front end
More informationElectrical and Electronic Laboratory Faculty of Engineering Chulalongkorn University. Cathode-Ray Oscilloscope (CRO)
2141274 Electrical and Electronic Laboratory Faculty of Engineering Chulalongkorn University Cathode-Ray Oscilloscope (CRO) Objectives You will be able to use an oscilloscope to measure voltage, frequency
More informationA Fast Magnet Current Change Monitor for Machine Protection in HERA and the LHC
10th ICALEPCS Int. Conf. on Accelerator & Large Expt. Physics Control Systems. Geneva, 10-14 Oct 2005, PO2.042-4 (2005) A Fast Magnet Current Change Monitor for Machine Protection in HERA and the LHC M.Werner
More informationSummary of the 1 st Beam Line Review Meeting Injector ( )
Summary of the 1 st Beam Line Review Meeting Injector (23.10.2006) 15.11.2006 Review the status of: beam dynamics understanding and simulations completeness of beam line description conceptual design of
More informationCEBAF Accelerator Update. Michael Tiefenback CASA Accelerator Physics Experimental Liaison June 14, 2017
CEBAF Accelerator Update Michael Tiefenback CASA Accelerator Physics Experimental Liaison June 14, 2017 CLAS12 Collaboration Meeting, June 13-16, 2017 1 Accelerator Division Leadership On April 30 Andrew
More informationPresent Status and Future Upgrade of KEKB Injector Linac
Present Status and Future Upgrade of KEKB Injector Linac Kazuro Furukawa, for e /e + Linac Group Present Status Upgrade in the Near Future R&D towards SuperKEKB 1 Machine Features Present Status and Future
More informationESS: The Machine. Bucharest, 24 April Håkan Danared Deputy Head Accelerator Division. H. Danared Industry & Partner Days Bucharest Page 1
ESS: The Machine Bucharest, 24 April 2014 Håkan Danared Deputy Head Accelerator Division H. Danared Industry & Partner Days Bucharest Page 1 2025 ESS construction complete 2009 Decision: ESS will be built
More informationRecent APS Storage Ring Instrumentation Developments. Glenn Decker Advanced Photon Source Beam Diagnostics March 1, 2010
Recent APS Storage Ring Instrumentation Developments Glenn Decker Advanced Photon Source Beam Diagnostics March 1, 2010 Ring Diagnostics Overview RF beam position monitor technology Photon beam position
More information5 Project Costs and Schedule
93 5 Project Costs and Schedule 5.1 Overview The cost evaluation for the integrated version of the XFEL with 30 experiments and 35 GeV beam energy as described in the TDR-2001 yielded 673 million EUR for
More informationLHC Nominal injection sequence
LHC Nominal injection sequence Mike Lamont Acknowledgements: Reyes Alemany Fernandez, Brennan Goddard Nominal injection Overall injection scheme Pilot R1, Pilot R2, Intermediate R1 Optimise Intermediate
More informationX-ray BPM-Based Feedback System at the APS Storage Ring. O. Singh, L. Erwin, G. Decker, R. Laird and F. Lenkszus
X-ray BPM-Based Feedback System at the APS Storage Ring O Singh, L Erwin, G Decker, R Laird and F Lenkszus 9 6$ so f!j~@6j Advanced Photon Source, Argonne National Luboratoq, 9700 South Cass Avenue, Argonne,
More information45 MW, 22.8 GHz Second-Harmonic Multiplier for High-Gradient Tests*
US High Gradient Research Collaboration Workshop. SLAC, May 23-25, 2007 45 MW, 22.8 GHz Second-Harmonic Multiplier for High-Gradient Tests* V.P. Yakovlev 1, S.Yu. Kazakov 1,2, and J.L. Hirshfield 1,3 1
More informationWelcome and FRIB Project Status. FRIB Highlights and Plan Ahead
Welcome and FRIB Project Status Thomas Glasmacher Project Manager This material is based upon work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661.
More informationTHE DESIGN OF A LEAD-BISMUTH TARGET SYSTEM WITH A DUAL INJECTION TUBE
THE DESIGN OF A LEAD-BISMUTH TARGET SYSTEM WITH A DUAL INJECTION TUBE Chungho Cho, Yonghee Kim, Tae Yung Song, Won Seok Park Korea Atomic Energy Research Institute, Korea Abstract A spallation target system
More informationPerformance of a DC GaAs photocathode gun for the Jefferson lab FEL
Nuclear Instruments and Methods in Physics Research A 475 (2001) 549 553 Performance of a DC GaAs photocathode gun for the Jefferson lab FEL T. Siggins a, *, C. Sinclair a, C. Bohn b, D. Bullard a, D.
More informationILC Damping Ring Lattice Status Report. Louis Emery and Aimin Xiao Argonne National Laboratory Presented at KEK workshop Dec 18th, 2007
Status Report Louis Emery and Aimin Xiao Argonne National Laboratory Presented at KEK workshop Dec 18th, 2007 Outline New 8-fold symmetric lattice on ILC Cornell wiki pages, as of 12/18/2007 Separated
More informationAvoiding False Pass or False Fail
Avoiding False Pass or False Fail By Michael Smith, Teradyne, October 2012 There is an expectation from consumers that today s electronic products will just work and that electronic manufacturers have
More informationPEP-II IR-2 Alignment
SLAC-PUB-10328 January 2004 PEP-II IR-2 Alignment A. Seryi, S. Ecklund, C. Le Cocq, R. Pushor, R. Ruland, Z. Wolf SLAC, Stanford, CA 94025, USA This paper describes the first results and preliminary analysis
More information