LCLS Linac Technical Design Review Diagnostics and Controls

Transcription

1 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Linac Technical Design Review Diagnostics and Controls December 12, 12, 2003 Requirements for for beamline instrumentation Upgrades for for conventional diagnostics BPMs, BPMs, PROFs, PROFs,, Wire Wire scanners, scanners, Toroids, Toroids,, Collimators, Collimators, Stoppers Stoppers Prototyping developments for for bunch length and and timing devices Definition of of control system requirements Patrick Krejcik,

2 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Beamline instrumentation Conventional diagnostics and their upgrades BPMs, Toroids,, Wire Wire scanners, Prof Prof Monitors, Synchrotron Radiation, Beam Phase, Collimation, Loss monitors Bunch length and timing diagnostics Fast, single-bunch relative length measurement for for tuning Linac Linac energy energy wakeloss wakelossscan scan THz THz spectral spectral power power OTR OTR CSR CSR Absolute bunch length determination Average Average bunch bunch length length from from CTR CTR autocorrelation autocorrelation 3-bunch 3-bunch measurement measurement with with transverse transverse RF RF deflecting deflecting cavity cavity Single Single shot shot electro electro optic optic pump pump probe probe measurement measurement Patrick Krejcik,

3 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Controls Modes of of beam operation Control system architecture requirements Single pulse reading and and id id in in a shared SLC/Epics system Timing requirements Low level RF control Feedback requirements. Pulse-to-pulse control of of MPS Orbit position & angle, energy, beam phase, bunch length Stoppers and and beam dumpers PPS Control room Patrick Krejcik,

4 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Conventional diagnostics and their upgrades BPMS Linac BPM modules to to be be upgraded Resolution requirements 5 um um for for nc nc New New modules may may be be either camac or or VME packaging Long Long lead lead item, item, no no resources resources as as yet. yet. New New stripline BPMs to to be be fabricated for for chicanes um um res. res. for for nc ncin in a 3 cm cm x x cm cm chamber chamber New New stripline BPMs to to be be fabricated for for the the LTU LTU in in addition to to existing FFTB BPM Last Last 8 LTU LTU BPMs redundant with with undulator-style cavity BPMs 1 um um resolution resolution at at nc nc Patrick Krejcik,

5 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Conventional diagnostics and their upgrades Wire Wire scanners average, projected emittance Lattice Lattice locations optimized for for phase phase advance Small Small wire wire diameters for for low low emittance beams beams Compromise between high high Z for for signal signal and and low low Z carbon carbon wires wires in in the t the LTU LTU to to minimize beam beam loss loss in in the the undulator Prof Prof Monitors single shot shot beam size, size, energy spread High High resolution measurement of of small small spots spots to to be be achieved with with OTR OOTR screens ( (disruptive) But But requires requires careful, careful, remote remote optics optics engineering engineering layout layout and and digital digital video video acquisition acquisition OTR OTR screens screens require require optical optical alignment alignment gaining gaining experience experience at at SPPS SPPS Can Can distinguish distinguish OTR OTR from from sync sync rad. rad.. in in chicane chicane bends bends with with polarizers polarizers SPPS SPPS BC BC chicane chicane measured measured energy energy spread spread SR background Patrick Krejcik,

6 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Synchrotron Radiation: single shot projected energy spread Generated from from vertical chicane wiggler in in a horizontal dispersion region Lattice optimized for for high high E E resolution: low low β x, x, high high η x x Optical resolution set set by by divergence of of x-rays, x filter filter out out low low energy x-rays x with with foil foil and and use use thin thin fluorescent crystal Patrick Krejcik,

7 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Synchrotron Radiation: single shot projected energy spread Single Single shot shot measurement measurement of of x-ray x-ray stripe stripe Compared Compared to to energy energy spread spread at at dump dump spectrometer spectrometer E Single pulse x-ray Dumpline spectrometer Patrick Krejcik,

8 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Conventional diagnostics and their upgrades Beam Phase Monitors Use Use linac linac style style S-band S monitor monitor cavities cavities Measure pulse-to-pulse phase phase jitter jitter Subject Subject to to thermal thermal drift drift so so can t can t use use for for feedback control control of of phase phase Thermal Thermal stabilization stabilization technology technology (as (as required required for for the the undulator) undulator) may may make make this this possible possible in in the the future. future. Beam Beam phase phase can can be be measured w.r.t. w.r.t. RF RF distribution distribution Laser Laser from from injector injector or or at at experiment experiment Patrick Krejcik,

9 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Conventional diagnostics and their upgrades Collimation Movable energy collimator in in each chicane Diagnostic, Diagnostic, and and later later for for foil foil slits slits Pair Pair of of adjustable energy collimators in in the the dog-leg bend of of the the LTU LTU Three x & y adjustable collimators in in the the matching section of of the the e LTU LTU Two Two betatron betatron phases phases and and one one clean-up clean-up in in each each plane plane Beam Loss Monitors PLIC cables along the the length of of the the machine Protection Ion Ion Chambers at at Injection, Injection, BC1 BC1 & BC2, BC2, dog-leg dog-leg bend, bend, collimation collimation section section Toroid average current comparators around BC1 BC1 & BC2 BC2 Experience Experience with with SPPS SPPS Patrick Krejcik,

10 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Bunch length and timing diagnostics Fast, single-bunch relative length measurement Linac energy wakeloss scan Shorter Shorter bunches lose lose more more energy energy from from longitudinal wakes wakes in in the the linac linac Use Use energy energy feedback in in LTU LTU dog-leg bend bend Plus Plus energy energy feedback in in BC2 BC2 to to maintain fixed fixed energy energy while while scanning L2 L2 phase phase Demonstrated at at SPPS SPPS as as tuning tuning tool tool Confirmation of of model model for for longitudinal wakes wakes in in S-band S linac linac for for short short bunches Patrick Krejcik,

11 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Relative bunch length measurement at at SPPS based on on wakefield energy loss loss scan scan Energy change measured at the end of the linac as a function of the linac phase (chirp) upstream of the compressor chicane Predicted shape due to wakeloss plus RF curvature Shortest bunch has greatest energy loss Predicted wakeloss (EMMA) For bunch length s z Patrick Krejcik,

12 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Bunch length and timing diagnostics Fast, single-bunch relative length measurement THz THz spectral power Coherent Coherent radiation radiation from from the the bunch bunch increases increases in in power power at at shorter shorter wavelengths wavelengths as as bunch bunch length length is is reduced reduced Coherent Coherent radiation radiation detected detected as as either either OTR OTR from from a a thin thin foil foil demonstrated demonstrated at at SLAC/SPPS SLAC/SPPS CSR CSR from from a a bend bend field field demonstrated demonstrated at at TJNAF TJNAF Difficult Difficult to to calibrate calibrate as as an an absolute absolute bunch bunch length length measurement measurement But But relative relative changes changes in in signal signal clearly clearly show show minimum minimum bunch bunch length length in in tuning tuning scans scans Simple Simple spectral spectral analysis analysis showing showing power power at at different different wavelengths wavelengths can can be be used used to to tune tune to to arbitrary arbitrary wavelengths wavelengths under under test test DESY/SPPS DESY/SPPS Patrick Krejcik,

13 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Bunch length and timing diagnostics THz spectral power OTR issues studied at at SPPS Intercepting Intercepting thin thin foil foil (OTR) (OTR) versus versus foil foil with with hole hole (ODR) (ODR) Wavelength Wavelength response response of of vacuum vacuum window window Fused Fused silica silica Mylar Mylar foil foil vacuum vacuum window window Window Window diameter diameter Wavelength Wavelength response response of of water water vapor vapor Dry Dry nitrogen nitrogen blanket blanket Hole experiment! Patrick Krejcik,

14 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Far-Infrared Detection of of Wakefields from Ultra-Short Bunches Comparison of bunch length minimized according to wakefield loss and THz power 500 Linac Wake Loss foil energy loss [MeV] Wake energy loss LINAC Wakefield diffraction radiation wavelength comparable to bunch length Pyroelectric detector Pyrometer signal [arb. units] FFTB Pyrometer Signal Linac phase THz power FFTB linac phase offset from crest [deg. S-Band] GADC Patrick Krejcik,

15 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Absolute bunch length determination Average bunch bunch length length from from CTR CTR autocorrelation Radiation Radiation from from the the OTR OTR screen screen is is focused focused into into an an interferometer interferometer One One arm arm of of interferometer interferometer is is movable, movable, so so two two profiles profiles are are swept swept through through each each other other Measured Measured bunch bunch length length is is calibrated calibrated in in microns microns of of arm arm motion motion Averaged Averaged over over many many pulses, pulses, so so integrates integrates any any bunch bunch length length jitter jitter OAP Mylar window S1 D1 D2/D1 M. Hogan, P. Mugli SPPS 48 fs rms D2 S2 M2 M1 M2 posn. Patrick Krejcik,

16 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Bunch length and timing diagnostics Microbunching diagnostics At At exit exit of of BC1 BC1 & BC2 BC2 Coherent Coherent transition transition radiation radiation Spectral Spectral power power measurements measurements measurements measurements can can resolve resolve micron- micronsized sized substructure substructure in in the the bunch, bunch, demonstrated demonstrated at at LEUTL LEUTL at at um um scale scale (Lumpkin) (Lumpkin) Coherent Coherent synchrotron synchrotron monitor monitor from from final final BC BC bend bend Spectral Spectral power power measurements measurements Analyze Analyze as as radiation radiation from from an an edge edge Z. Z. Huang: Huang: expect expect to to observe observe microstructure microstructure at at l l 0 /comp.fact 0 /comp.fact Patrick Krejcik,

17 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Bunch length and timing diagnostics Absolute bunch length determination 3-bunch measurement with with transverse RF RF deflecting cavity Tested Tested at at SPPS SPPS Initial Initial transverse transverse tilt tilt to to the the bunch bunch from from transverse transverse wakes wakes requires requires res measuring measuring at at both both zero zero phase phase crossings crossings Absolute Absolute calibration calibration of of bunch bunch length length in in units units of of screen screen dimensions dimensions versus versus deg. deg. S-bandS S-band Resolution Resolution determined determined by by ratio ratio of of RF RF vertical vertical kick kick to to vertical vertical beam bbeam size size Achieved Achieved um um resolution resolution in in SPPS SPPS at at GeV GeV with with 5 5 um um emittance emittance 1 Hz Hz pulse stealing mode of of operation (new) (new) pulsed pulsed magnet magnet deflects deflects beam beam onto onto off-axis off-axis screen screen Future option is is an an x-band x Tcav.. in in the the LTU LTU Patrick Krejcik,

18 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Bunch Length Measurements with with the the RF RFTransverse Deflecting Cavity 2.4 m 30 MW σ y Bunch length reconstruction Measure streak at 3 different phases (Streak size) 2 X A = E-02 STD DEV = E-03 B = STD DEV = C = STD DEV = RMS FIT ERROR = * * Cavity on Cavity off * E σ z = 90 µm SBST LI29 1 PDES (S-29-1) Cavity on * * E * Asymmetric parabola indicates incoming tilt to beam Patrick Krejcik, 1-APR-03 20:21:16

19 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Calibration scan for RF transverse deflecting cavity Beam centroid [pixels] Bunch lenght calibrated in units of the wavelength of the S-band RF Further requirements for : High resolution OTR screen Wide angle, linear view optics Cavity phase [deg. S-Band] Patrick Krejcik,

20 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Slice parameters from transverse RF deflecting cavity OTR screen down stream of of the Tcav.. can be be used in in conjunction with a quadrupole scan to to measure horizontal slice emittance σ x (β) Distance along the bunch OTR screen down stream of of the Tcav.. At At a horizontal dispersion location, large η x, x, small β x, x, can measure slice energy spread Ε Distance along the bunch Patrick Krejcik,

21 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Bunch length and timing diagnostics Absolute bunch length determination Single shot shot electro optic pump probe measurement Transforms Transforms the the problem problem of of measuring measuring short short electron electron bunch bunch length length to to measuring measuring a short short pulse pulse of of laser laser light. light. Electro-optic Electro-optic optic process process is is inherently inherently fast, fast, < 2 fs fs Time Time resolution resolution is is dependant dependant on on crystal crystal geometry geometry and and laser laser BW BW Investigating Investigating two two geometries geometries at at SPPS SPPS Femtosecond Femtosecond laser laser systems systems are are complex complex Innovation Innovation at at SPPS SPPS is is transport transport a compressed compressed beam beam to to the the e-e e-beamline with with a long long fiber fiber Patrick Krejcik,

22 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Electro Optic Bunch Length Measurement Defining aperture M1 EO xtal M2 Beam axis Geometry chosen to measure direct electric field from bunch, not wakefield Modelled by H. Schlarb Probe laser electrons Patrick Krejcik,

23 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Resolution limit in in temporal-to-spectral translation BW limited pulse Short chirp T res = TT 0 C Long chirp Spectral profiles Temporal profile However, recent work shows this limit can be overcome with noncollinear cross correlation of the light before and after the EO crystal S.P. Jamison, Optics Letters, 28, 1710, 2003 Patrick Krejcik,

24 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Temporal to to spatial geometry under test at at SPPS E r electrons P EO Xtal E r Elevation view End view Principal of temporal-spatial correlation Line image camera E r Plan view Patrick Krejcik,

25 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory SPPS Electro Optic bunch length measurements Adrian Adrian Cavalieri Cavalieri et et al al 6 ps Patrick Krejcik,

26 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory SPPS --EO signal vs vstime and single bunch thick crystal with long bunch > 1 ps Patrick Krejcik,

27 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory SPPS --time sequence of of multiple EO images Patrick Krejcik,

28 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Controls Modes of of beam operation No No beam, beam, injector injector in in controlled controlled access access laser laser to to cathode cathode permissive, permissive, but but no no high-power high-power RF RF permissive permissive Injector Injector operation operation with with beam beam to to the the sector sector dump dump in in the the linac linachousing 1 1 nc nc at at Hz Hz maximum maximum Beam Beam to to the the BSY, BSY, stopped stopped in in the the BSY BSY 1 1 nc nc at at Hz Hz maximum maximum Beam Beam to to the the LTU LTU (linac (linac to to undulator) undulator) single single bunch bunch beam beam dump dump 1 1 nc nc at at Hz Hz maximum maximum Beam Beam to to the the undulator undulator entrance entrance tune-up tune-up up dump dump 1 1 nc nc at at Hz Hz maximum maximum Beam Beam to to the the final final beam beam dump dump 1 1 nc nc at at Hz Hz maximum maximum Lase r 1 Injector dump linac BSY BSY dump Muon shield DL2 SBBD Tuneup dump undulato r dump Patrick Krejcik,

29 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Controls Timing requirements Choice of of frequencies The The linac linac RF RF operates operates at at MHz MHz The The laser laser for for the the RF RF photoinjector photoinjector will will be be synchronized synchronized to to the the 24th 224th subharmonic subharmonic at at MHz MHz The The timing system counts cycles of of MHz MHz and and can can be be adjusted in iin inter inter periods of of this this frequency, giving a timing step step size size of of ns. ns. Time slots slots chosen to to avoid PEP PEP II II phase shifts on on the the MDL Preferable Preferable solution solution is is if if PEP PEP II II phase phase shifts shifts are are removed removed from from MDLM MDL Trigger resolution of of ns ns and and stability of of ps psadequate Although Although doesn t doesn t provide provide absolute absolute RF RF bucket bucket determination determination Pulse identification, buffering and and feedback RF RF phase locking and and stability Patrick Krejcik,

30 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Controls - system architecture requirements SLC SCP displays How to to preserve single pulse reading and id id in in a shared SLC/Epics system VMS operating system SLC Control Program System support software Facilities software application software Workstations OS: SunOS, Solaris HPUX DEC-UNIX SGIX Windows NT Linux ethernet EPICS Network protocols database I/O Controllers OS: vxworks Star network Communication line Field I/O Field I/O Field I/O Field I/O MPG µ-processor µ-processor camac crate timing Low level RF distribution Preserve the phase-locked timing fiducials carried by the SLAC low-level RF And the multi-tasking beam pattern broadcast Patrick Krejcik,

31 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Control system hybrid Requires multi-protocol support on on the the LAN LAN RPC ENS Equipment Name Server timing API Application Program Interface Device Class Libraries RPC EPICS Display Device Class Libraries VME Crate CPU + Hard Drive EPICS IOC CAMAC Crate RPC CA RPC RPC CA RPC CA API Library SDDS Display SDDS toolkit Library API Library fiducial PLC Programmable Logic Controller e.g. MPS RPC RPC CA LabView Display VI Library API Library Matlab Display RPC CA API Library? SCP SLC Control Program RF distribution LAN Ethernet backbone Patrick Krejcik,

32 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Controls - Low level RF Sector Drive Line Present parallel input-output processor (PIOP) control of of phase and and amplitude does not not meet specs Feasibility study to to packaging of of new new module in in either camac or or VME/epics Long Long lead lead item, item, but but no no resources allocated so so far far Some klystrons will will run run unsaturated with with individual phase and and amplitude control using solid solid state subboosters New Solid-State Sub-Booster and Electronic Phase Shifter IPA - Isolator Phase Attenuator Klystron SLED Cavity Output Coupler SSSB PIOP driver CAMAC Sector Phase Reference Line PAD Phase Amplitude Detector Patrick Krejcik,

33 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Controls - Low level RF Low-noise, low-drift RF RF source in in sect sect Change from from CDR, CDR, now now lock lock at at MHz MHz Sector 0 Sector 20 Master Oscillator x MHz Xtal 8.5 MHz 476 MHz 60 W Fiducial Generator 1/360 s Main Drive Line 360 Hz Trigger Generator Laser Trig Laser Mode Lock 119 MHz Gun Klystron 2856 MHz x6 476 MHz Master Oscillator Σ To L0, L1 klystrons Fiber Optic Driver To Experiments 1/120 s PEP Timing Generator 119 MHz Fiber Optic coupler To Exp. laser X4 119 MHz Xtal Gated Lock New 119 Experiments MHz Trigger Gen. Laser Trig 2856 MHz Patrick Krejcik,

34 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Controls - Low level RF Low-noise, low-drift RF RF oscillator issues Oscillator and and distribution housed housed in in thermally stabilized enclosure In In spite spite of of this this there there will will be be some some drift drift requiring requiring beam-based beam-based based feedback feedback Advances in in technology have have allowed us us to to choose choose MHz MHz over over previous MHz MHz Greatly Greatly simplifies simplifies timing timing system system as as we we are are now now in in synchronization synchronization n with with existing existing timing timing fiducials fiducials Big Big advantage advantage for for experimenters experimenters who who can can mode mode lock lock their their lasers lasers to to photoinjector photoinjector laser laser with with MHz MHz optical optical pulses pulses and and always always be be in in the the same same RF RF bucketb bucket Lesson Lesson learned learned from from SPPS SPPS that that exp exp laser laser is is susceptible susceptible to to bucket bucket jumps jumps will will operate on on a different time time slot slot from from PEP PEP II II Avoid Avoid phase phase jumps jumps on on MDL MDL during during PEP PEP injection injection Feasibility Feasibility study study to to reconfigure reconfigure phase phase shifters shifters and and avoid avoid MDL MDL phase phase jumps jumps Patrick Krejcik,

35 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Controls Feedback requirements. Pulse-to-pulse control of of Orbit Orbit position & angle, angle, energy energy as as in in SLC SLC beam beam phase, phase, Necessary, Necessary, for for example, example, to to measure measure orbit orbit after after RF RF deflecting deflecting cavity cavity to to maintain maintain cavity cavity at at zero zero phase phase crossing crossing bunch bunch length length Use Use relative relative signal signal strength strength from from OTR OTR THz THz spectral spectral power power measurement measurement ment Demonstrated Demonstrated at at SPPS SPPS with with dither dither feedback feedback to to minimize minimize bunch bunch length length Needs Needs power power measurement measurement at at several several THz THz wavelengths wavelengths to to tune tune to to arbitrary arbitrary bunch bunch lengths lengths Decouple Decouple longitudinal longitudinal feedback feedback requirements requirements Energy Energy feedback feedback maintains maintains constant constant energy energy at at the the BC BC chicane chicane Bunch Bunch length length feedback feedback controls controls the the linac linac phase phase (energy (energy chirp) chirp) Patrick Krejcik,

36 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Controls Energy feedback Klystron off on φ +φ Klystron 1 Klystron 2 Energy Energy feedback feedback at at SPPS SPPS chicane chicane responding responding to to a step step energy energy change change Energy Energy measured at at a dispersive BPM, BPM, Actuator is is a klystron phase phase shifter shifter Energy Energy jitter jittermeasured from from chicane chicane feedback feedback system system MeV MeVrms 0.06% 0.06% Patrick Krejcik,

37 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Dither feedback control of of bunch length minimization -- L. L. Hendrickson Hendrickson Bunch length monitor response Feedback correction signal optimum ping Dither time steps of 10 seconds Linac phase Jitter Jitter in in bunch bunch length length signal signal over over seconds seconds ~10% ~10% rms rms Patrick Krejcik,

38 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Controls MPS Stoppers and and beam dumpers (tune-up up dumps) Injector Injector energy energy spectrometer spectrometer (full (full rate) rate) BSY, BSY, D2 D2 (full (full rate) rate) Exit Exit of of muon muon shield, shield, formerly formerly known known as as ST61 ST61 (10 (10 Hz) Hz) Single Single bunch bunch beam beam dumper dumper (SBBD) (SBBD) after after LTU LTU dogleg dogleg (full (full rate) rate) SLC SLC design design End End of of LTU LTU (10 (10 Hz) Hz) Bunch compressor MPS PLIC, PLIC, PICs, PICs,, Av. Av. Current Current monitor monitor comparator comparator interlocked interlocked to to gun gun rate rate control control LTU LTU Collimator MPS PLIC, PLIC, PICs PICsinterlocked to to SBBD SBBD Allows Allows full full rate rate in in the the linac linac and and arbitrary arbitrary rate rate to to the the undulator undulator Patrick Krejcik,

39 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Controls PPS zones 1. injector Laser Key entrance gate PPS Key entrance gate Shield wall D2 stopper PPS Key entrance gate PPS Key entrance gate Injector stopper 2. LINAC gate 3. BSY + Sect. 30 muon shield 4. LTU gate 5. undulator gate 6. FEE BAS II stopper Sector entrances PPS Key entrance gate Equipment & emergency gate Dump 7. Near Hall x-ray transport 8. Far Hall Patrick Krejcik,

40 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Controls - PPS Patrick Krejcik,

41 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Controls - PPS Changes to to linac PPS Following preliminary discussions with with Saleski, Rokni Upgrade linac linac entries for for controlled access Keybanks, Keybanks,, video video Possibly combine 5 sectors instead of of 2 into into one one PPS PPS zone Fewer Fewer systems systems to to certify certify Each Each zone zone contains contains an an equipment equipment hatch hatch Interlock sect sect modulators individually sect. sect VVS VVS not not turned turned off off for for injector injector vault vault entries entries while while PEP PEP II II running running Sect.19 BAS BAS II II beam stopper to to become a backward beam stopper Allows Allows access access to to the the linac linac upstream upstream of of sect. sect while while running running ng System upgrades Migrate to to PLC PLC instead of of relay logic logic Try Try and and do do this this in in the the BSY BSY before starts Patrick Krejcik,

42 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Control Room will will double double present present occupancy and and number of of consoles Feasibility study study to to expand expand space space by by removing old old racks racks and and replacing with with modular consoles N Room 114 Room 100 Room Room Patrick Krejcik,

43 Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Conclusion Upgrades to to conventional diagnostic instrumentation have been listed Linac relies heavily on on several new and complex bunch length and timing diagnostics Development work on on these has has started at at SPPS Control system faces challenge of of compatibility with existing systems and integrating new, multi-protocol systems Have defined the the constraints this this system faces, plus plus the the requirements for for, particularly the the timing stability Some conceptual designs discussed for for SLC/EPICS hybrid (Bob Dalaseio) ) but but now now needs engineering design Patrick Krejcik,