Initial Commissioning Tasks for the LTU/FEL Run (2008-2009)

Oct. 27, 2008

The First Four Weeks (Nov. 3-28, 2008)

Goal #1:Re-establish beam to 52-SL2 at 30 Hz & 0.25 nC

Goal #2:Release and test all new controls software updates that are ready

Goal #3:Begin commissioning of laser heater system (w/o undulator)

  1. All injector, linac, and BSY pre-beam checkout done and all magnets standardized to startup configs (SCORE: Gun-TD11 Gold #2103, TD11-BSY Gold #2174, and for the SCP: TD11-BSY magnets NOR #141, BPM-ref NOR #207 – see R. Iverson)
  2. No unnecessary new controls software released yet
  3. RF processing of gun and injector RF (gun separated from L0a/b with VV01)
  4. See Axel Brachmann’s procedure (6.0 MV max. gun voltage)
  5. Check RF trip power interlock
  6. Note TCAV0 (20-5) was vented and 21-1 klystron was replaced
  7. Re-establish UV drive laser on VCC and cathode with 1.2-mm iris and ~20µJ
  8. Run through laser checklist (laser timing will start random) – 6.0 ps
  9. Re-GOLD (if necessary) and switch ON the laser pointing feedback loops
  10. Take 0.25-nC beam to 6-MeV spectrometer (1-10 Hz)
  11. Injector vault fan switched off?
  12. Wide range Schottky scan
  13. Image cathode on YAG01 and verify cathode position (no “spider”)
  14. Measure QE
  15. Align laser using solenoid-scan GUI (with Aug. ’08 offsets)
  16. Steer to YAGG1
  17. Calibrate gun RF amplitude on YAGG1 (6-MeV spectrometer)
  18. Measure energy spread on YAGG1 vs. laser phase
  19. Re-GOLD (if necessary) and switch ON the following feedback loops:
  20. Laser Power Set
  21. Bunch charge
  22. Take 0.25-nC beam to 135-MeV spectrometer (1-10 Hz, see procedure)
  23. Make sure BXS is properly standardized (with trim coil OFF, then set to 1.06 A)
  24. New laser-heater chicane OFF, LH-undulator not installed, and no IR laser
  25. Rough steer in x and y
  26. Check PH01 timing reading (see R. Akre) – maybe shift laser timing?
  27. Phase and calibrate L0a amplitude on YAGS2 (135-MeV spectrometer)
  28. Phase and calibrate L0b amplitude on YAGS2 (135-MeV spectrometer)
  29. Check YAGS2 for “on-crest” operation with TCAV0 ON (no linear chirp)
  30. Fine steer in x and y
  31. If time allows, measure OTR2 Twiss emittance and run β-matching, and correct any induced steering (after matching)
  32. If time allows, measure bunch length on OTR2 with TCAV0
  33. Re-GOLD (if necessary) and switch ON injector feedback loops:
  34. Gun launch
  35. Injector launch
  36. Take beam to TD11 stopper with BC1 ON at R56 = 45.5 mm, BC1 offset = 247.6 mm, and energy = 250 MeV (1-10 Hz)
  37. Adjust L1S phase (& voltage?)roughly to get beam through BC1 (L1X OFF)
  38. Steer beam reasonably flat in x and y using minimal corrector tweaks
  39. Calibrate L1S amplitude at crest phase using the BC1 BPM (L1X OFF)
  40. Re-GOLD and switch ON BC1 energy feedback (with DL1 energy, but no BC1 bunch length yet)
  41. Calibrate L1X amplitude at decal-crest phase usingthe BC1 BPM (scan L1X voltage and correlate withL1S voltage feedback response needed to hold BC1 BPM constant in x)
  42. Re-GOLD (with BPMS LI21 201x = +0.1 mm) and switch ON X-cavity launch feedback loop (leave BPM offset unchanged)
  43. Phase L1S OFF crest by 21 degrees (see OP GUI)
  44. Phase L1X OFF crest by 160 degrees (see OP GUI)
  45. Check BL11 mirror is inserted (no filters INserted)
  46. Test BL11A response to L1S phase?
  47. If ready, re-GOLD (if necessary) and switch ON BC1-bunch-length feedback loop (+ DL1-energy + BC1-energy)
  48. Checkout injector BPM timing, attenuation, and reasonable response to a few oscillations (any BPMs now backwards or not responding in x, y, or TMIT?)
  49. Take beam to 52-SL2 stopper at 13.64 GeV with BC2 ON at R56 = 24.7 mm, BC2 offset = 363.0 mm, and BC2 energy = 4.3 GeV (1-10 Hz)
  50. Standardize LI21 quadrupole and corrector magnets
  51. Open all 29/30 collimators (+-10 mm)
  52. Note sec-21, 23, 29, & 30 (especially) are at random phases
  53. CTRL-C the “phase_control.m” script and phase and GOLD all 21-24 KLYS & SBST using SCP (see J. Frisch)
  54. Add or remove klystrons to get beam through BC2 (or vary phases?)
  55. Phase all RF stations (25-1 to 30-8, with all SBST PDES = 0)
  56. Set L2 RF phase to 36 deg using phase-scan GUI
  57. Run phase scans on 24-1 & 24-2 (and more?)
  58. Steer linac to BPM ref (note sec-22 through 23 now have EPICS control of quads & steering correctors - also ON SCP but LI23 feedback anymore)
  59. Check BL21 mirror is inserted
  60. Re-GOLD (if necessary) and switch ON linac/energy feedback loops:
  61. L2 launch
  62. LI26 SCP loop
  63. DL1-energy, BC1-energy, BC1-bunch-length, BC2-energy, and BC2-bunch-length
  64. FB31 energy loop
  65. Measure and correct emittance and matching at OTR2, WS12, and WS28 and re-establish good orbit, bunch compression, and stability at 30 Hz (0.25 nC)
  66. Begin controls software releases and testing…
  67. New MPS commissioning? (start with old MPS first)
  68. Laser BSA deployment
  69. Laser bug fixes (phase jumps)
  70. New L3 PACs
  71. Phase cavity software
  72. New L3 energy feedback
  73. Updated GUIs where needed
  74. etc…
  75. Install laser-heater undulator on 8-hr ROD in mid-late November
  76. Begin laser-heater chicane and IR laser testing…
  77. Match beam on OTR2 with heater OFF (undulator not installed)
  78. Turn ON heater chicane (35 mm X-offset at 135 MeV) with GUI and note/correct steering (beam to 135-MeV spectrometer)
  79. Check that injector phase is compensated properly by GUI
  80. Re-check OTR2 beam matching and correct again (note quad changes)
  81. Verify heater MPS logic (?)
  82. Find IR beam on OTRH1 & OTRH2 (laser attenuated to <1 µJ)
  83. Steer electron beam to same location on OTRs
  84. Time IR beam to electron beam using photodiode and scope locally
  85. Set laser energy to ~40 µJ (OTRs out, blocked photodiode)
  86. Look for energy spread increase on YAGS2 (TCAV0 ON) while scanning IR delay

December (or January) 2008

Goal #1:Establish beam to the main LCLS dump(if areas ready)

Goal #2:Finish RP commissioning tasks in LTU/dump(if areas ready)

Goal #3:Fully commission laser heater system and measure COTR impact

  1. Take beam to D-2 dump at 13.6 GeV (1-10 Hz)
  2. Execute RP commissioning plan for undulator complex:

January (or February) 2008 and Beyond

Goal #1:Commission LTU, Undulator, Dump, and FEE

Goal #2:Measure and Optimize SASE FEL power at 15 Å and below

Goal #3:Setup machine for AMO experiments in August 2009 (30 Hz)

  1. Install undulators in mid-March
  2. Take x-rays into FEE after May 14 , 2009
  3. Go to Goose (and stay)