Cooperation Activities for Linear Colliders

Transcription

1 Cooperation Activities for Linear Colliders focusing on the CERN-KEK cooperation Shinichiro Michizono with additional slides from Akira Yamamoto, Walter Wuensch, Steinar Stapnes (presenter) CERN-KEK Committee, CERN, Dec

2 CERN-KEK Cooperation for LCs Data management and safety system, visiting engineer from CERN Nano-beam technology Nano-beam size and the stability as a common subject for ILC and CLIC, using ATF-2 SCRF technology Input-power couplers with new ceramic windows (low secondary electron emission) Cryogenic engineering, specially on He inventory management Normal conducting acc. structure Accelerating Structures: testing, manufacturing, cooperation for industrialization study RF technology: Superconducting solenoid, for high-efficiency klystrons Civil engineering IR region CE design, referring to the CMS site (vertical access) experience, CE layout Optimization, using a Tunnel Optimization Tool (TOT) developed at CERN. Beam Dump design study 18 MW beam dump design engineering study as a common subject for CLIC and ILC. ILC Safety, power failure, environmental assessment based on LHC E-JADE Marie Curie EC Project for staff exchange with Japan (for CERN this means primarily with KEK)

3 Data management and safety system Visiting engineer from CERN by E-JADE He introduced the EDMS usage and experiences at CERN in the regular KEK-LC meeting. -> for the ILC data management Dr. Pedro Martel at CERN office in the KEK2-gokan building He also visited J-PARC to survey the access control system. -> for LC and LHC

4 Numbers of ATF beam weeks JFY Original operational plan, 21 weeks 22 weeks Number of ATF operation weeks reduced from 2014 due to the rise of an electricity price. CERN supports the additional ATF beam weeks. (by the Collaborative Research Contract between CERN and KEK) Special thanks for CERN s kindest cooperation and contribution!

5 CERN s Activity for CLIC/ILC at ATF2 Nanometer Beam Development Final Focus System studies for LCs Wakefield free steering method lead by CERN. Ground Motion Feed-forward for CLIC 14 Geophones has been installed in ATF2 by CERN and LAPP Ultra Low-beta optics for CLIC Two Octupoles by CERN has been installed. Beam Monitor Developments High resolution OTR-ODR, ChDR monitor Collaborative Research Contract between CERN and KEK supports the ATF beam operation.

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7 Progress in FF Beam Size and Stability at ATF2 Goal 1: Establish the ILC final focus method with same optics and comparable beamline tolerances ATF2 Goal : 37 nm ILC 6 nm Achieved 41 nm (2016) Goal 2: Develop a few nm position stabilization for the ILC collision FB latency 133 nsec achieved (target: < 300 nsec) positon jitter at IP: nm (2018) (limited by the BPM resolution) We continue efforts to achieve goal 1 and goal 2. History of ATF2 small beam Nano-meter stabilization at IP (2018) FB off FB on

8 Demonstration of the Intra-train position Feedback (FONT) at ATF2 fbrun3, 07-Nov-18 interleaved feedback Upstream feedback: P2 Position jitter of bunch μm (feedback off) 0.17 μm (feedback on) Reduction factor = 10.5 Bunch-bunch correlation (feedback off) (feedback on) D.Bett, 22 nd ATF2 Project Meeting, Nov

9 Wakefield studies using small beam at ATF2 The wakefield is generated by the beam orbit jitter of the beam. The effect is superposed, because polarities of (y, y ) are changed for IP angle jitter, simultaneously. Bunch tail is kicked by the wakefield, generated by the beam. The kicked amplitude is proportional to the beam angular jitter amplitude. 20 Dynamic wakefield effect The wakefield is generated by the misalignment and/or the beam orbit offset of vacuum component. Bunch tail is kicked by the wakefield, generated by the beam. The kicked amplitude is proportional to the beam position offset w.r.t. the chamber center. The minimum intensity dependence was reduced 8.5 nm/1e9 => 5.0 nm/1e9. Static wakefield effect By using a little bit large betay* optics (10 x 5 optics ), the dynamic effect was kept to be enough small. The 41nm beam size was realized under low intensity and FONT feedback. Studies have been conducted to understand the wakefield effect decrease static effect by introducing the cancellation wake source Small beam trial will be performed in Spring 2019 with a higher intensity. ( dynamic intensity dependence ) = 0.1 nm/1e9/urad = 2 nm/1e9 Intensity dependence measurement after the orbit and wakefield source optimization Intensity dependence measurement Updated 31 T.Okugi, 22 nd ATF2 Project Meeting, Nov

10 X-band at KEK CLIC prototype structures, tested at Nextef/Shield-A T18 àquad à TD18àT24àTD24àTD24R05àTD24R05 àt24thuàtd24r05 àdeflector àtd24r05 àtd26cc T18_Disk_#2 Deflector (SINAP) TD24R05_K T24THU_# TD18_Disk_# TD24R05_K TD26CC_K TD24R05_#4 T24_Disk_#3 TD24_Disk_#4 TD24R05_#2

11 Development of a Superconducting Solenoid for X-band Klystron beam-focusing Objective SC-mag technology to be demonstrated for high-efficiency X-band klystron for future linear accelerator applications Prototype SC Magnet Design: Superconductor: MgB 2 B c = > 0.7 T (at a warm bore aperture of ~ 0.3 m) Operation temperature: 20 K AC-plug power to be reduced: < 3 kw < 1.5 KW / Klystron, by pairing < 1/10 AC-power w/ Cu-Coil Progress and Further Plan: MgB 2 conductor performance confirmed, Magnet fabrication nearly completed, Magnet test plan: Jan. Feb Performance to be evaluated, using klystron, at CERN in A. Yamamoto MgB 2 SC Coil Cu Coil 11

12 Cooperation of the beam dump design for future LC s Optimization of the beam window thickness for ILC 17MW beam dump He gas 5m/s 50 max 1000 KEK members visited the LHC beam dump in March Alternative design study (graphite dump + He gas-flow)

13 Emergency response at ILC Power failure Fire He leakage Earthquake Spring water Tunnel access License/ Equipment ILC 1) <30 sec.:battery(control, monitor) 2) >30sec.:Emergency generator(light, drainage, He storage ) (Note:He system should be kept <+1atm. Quick storage will be necessary.) 3) <3 days:power recovery (Generator fuel stockpile) 1) Kamaboko-tunnel, Retreat to non-fire side/tunnel -> evacuation 2) The air conditioning circulation speed is controlled below the moving speed of a person. Evacuation faster than smoke (distance: <2.5 km + access tunnel) Note: Fire-resistive cable 1) Carry an oxygen tank, retreat along the tunnel bottom (He diffuses and stays at the top of the tunnel) (No liquid nitrogen underground) 2) Other than He leakage point (Cryo-unit), normal He recovery 1) Stand by next to stable large equipment. 2) Evacuate after the decay of the shake. Note: Earthquake vibration is relaxed to ~ 1/5 level at depth of 100 m Detection at advanced pit, drainage enhancement Evacuate to the beam tunnel side (no drain pump) evacuate. In case of overflowing spring water, via service tunnel, detector hall radiation monitor natural drainage. 1) Issue license after lecture and examination 2) Equipment at entry: - ILC-ID (Licensed) - Radiation worker batch (with monitor) - Helmet (LED search light attached - Portable oxygen tank (<30 minutes), - Oxygen concentration meter (with alarm) Bicycle, electric working vehicle (option) LEP/ LHC 1) <30 sec.:battery(control, monitor) 2) >30sec.:Emergency generator(light, drainage) (Note:He system can be ~20atm.) 3) <1 days:power recovery (Generator fuel stockpile) 1) Retreat to non-fire side -> evacuation 2) The air conditioning circulation speed is controlled below the moving speed of a person. Evacuation faster than smoke (distance: <3.4 km + elevator) Note: Fire-resistive cable 1) Carry an oxygen tank, retreat along the tunnel bottom (He diffuses and stays at the top of the tunnel) (No liquid nitrogen underground) 2) Other than He leakage point (Cryo-unit), normal He recovery 1) No large earthquake experience in this area. 2) No special guidelines. Prevention of spring water by the freezing method of the surrounding soil (during CMS shaft construction) There is no large spring water in tunnel after completion of construction. Trace amount of spring water is pumped up, radiation monitor and drainage. 1) Issue license after lecture and examination 2) Equipment at entry: - CERN-ID (Licensed) - Radiation worker batch (with monitor) - Helmet (LED search light attached - Portable oxygen tank (<30 minutes), - Oxygen concentration meter (with alarm) Bicycle, electric working vehicle (option)

14 Countermeasure against the Power failure ILC < 30 sec. Battery (Control, monitor) > 30sec. Emergency generator (light, drainage, He storage ) (Note:He system should be kept <+1atm. Quick storage will be necessary.) LEP/ LHC Battery (Control, monitor) Emergency generator (light, drainage) (Note:He system can be ~20atm.) More < 3 days: power recovery (Generator fuel stockpile) < 1 days: power recovery (Generator fuel stockpile)

15 ILC ground facility (reference: LEP/LHC/P4) Access tunnel LEP/LHC/P4: Cut high slope to the left Establish a campus design to preserve the landscape. (After dialogue with residents of the village on the mountain side) ILC Ground facility outline. The left side is the entrance of the access tunnel ( Tohoku plan) Ground building overview

16 E-JADE Europe-Japan Accelerator Development Exchange Programme Supports secondments : Three main technical WPs (accelerator project mostly) 2017: Adapted to include detector and physics studies for ILC (with new partners) Technical WPs: LHC and injectors - with upgrades/ffc/ SuperKEKb, ATF2, ILC/CLIC (several of the activities you have seen above are supported by E-JADE) Partners: CERN (coord), DESY, CEA, CNRS, CSIC, RHUL, OXF with Uni. Tokyo and KEK New partners: VINCA, AGH-Cracow, Tel Aviv University, Liverpool University, Université de Strasbourg, Université Paris-Sud, Tohoku University and Kyushu University. Not linked to E-JADE but related to KEK/Japan European LCC common fund and LCC hosting covered by CERN 16

17 KEK-ILC Action Plan, the European ILC preparation plan KEK-DG Yamauchi set up a WG to develop a KEK-ILC action plan in May, The KEK-ILC Action Plan was released in January It contains technical preparation tasks and a human resource development plan for the pre-preparation phase (current efforts) and the main-preparation phase (after green sign from MEXT). It focuses mainly on a development plan for KEK. After having established a discussion group with DOE, become the next important topic for MEXT. Letter to CERN in 2016 concerning European planning. discussions with Europe are likely to On the European side it was suggested to use the EJADE H2020 MC project to prepare the answer the effort was started October 2016 The European ILC preparation plan was produced in 2018: For EJADE institutes: CERN: S.Stapnes, CEA: O.Napoli, DESY: N.Walker/H.Weise/B.List, CNRS: P.Bambade/A.Jeremi, UK: P.Burrows, CSIC: A.Faus-Golfe EJADE WP3 and centrally: T.Schoerner-Sadenius, M. Stanitzki TDR: B.Foster 17

18 (A very short) Summary: 2018 was a very active year for CERN-KEK collaborative LC activities