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Commissioning August & September

Commissioning August & September. Agenda. 11:20 Coffee 11:30 Introduction Sue S 11:35 Controls (an overview) Brian M 10:55 Controls & Data Acquisition Software Ben S 12:15 RF Systems Alan W 12:40 Machine protection Steve B 13:00 Lunch 14:00 Magnets Ben S 14:15 Laser Steve J

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Commissioning August & September

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  1. Commissioning August & September

  2. Agenda 11:20 Coffee 11:30 Introduction Sue S 11:35 Controls (an overview) Brian M 10:55 Controls & Data Acquisition Software Ben S 12:15 RF Systems Alan W 12:40 Machine protection Steve B 13:00 Lunch 14:00 Magnets Ben S 14:15 Laser Steve J 14:40 Cryogenics TBC 15:00 Injector Rob S 15:20 Diagnostics Rob S 15:40 Coffee 15:55 Vacuum Keith M 16:15 Commissioning Sue S 16:35 The End!!! Speakers, please note that we have to strictly stick to time!!!

  3. Programme • Ramp down to 100 C (5c/hr) Fri 25/7/08 • HV Commissioning Monday 4/8/08 • SRS Switch off!! • First ALICE scheduled shutdown October 08

  4. GOOD BAD

  5. Gun & cathode work : Summary • Bakeout 200 degrees (20 degrees less than usual) • HV Gun conditioning • Aim for minimum volts for stable conditions 370kV! • Wafer heat clean & HV tests • If FE is present, commission at reduced voltage • Cathode activation • Cathode HV conditioning (usual 365kV) • If the FE is present, decide what gun voltage to use (below 350kV) • Decide on what bunch charge to use • probably ~40pC ?

  6. GUN – to - BOOSTER

  7. GUN – to - BOOSTER • Set the “commissioning” bunch charge • use QE scan results for estimates : • SOL-01 scan • required to set SOL-01 correctly for a given Q • Cross -calibrate BPM-01 and YAG-01 (skip if Lifetime low) • Set SOL-01 and SOL-02 • Steer the beam to the entrance of the booster • Set the buncher zero-crossing phase

  8. Booster to Linac Energy spread/spectrum Absolute energy Buncher gradient / phase setting Bunch charge Twiss parameters Energy spread Slit here Setting achromatic condition (Q01-Q05) Setting achromatic condition (Q10, Q12) Twiss parameters Emittance

  9. Booster-to-FCUP-01 • Thread the beam through booster (coarse) • Crest both cavities (coarse) • using LLRF signals • use lower Q (10-20pC) initially • Optimise SOL-02 setting • beam size and divergence (YAG-02) • emittance • Set the beam on axis of the booster • Thread the beam to FCUP-01 (coarse) • Set correct Q and buncher zero-crossing phase and gradient • Crest booster cavities (fine) and set correct phases • Check electron energy and adjust cavities gradients if needed re-adjustment of everything starting with SOL-01 may be needed • Set Q-01 to Q-04 • Measure baseline beam parameters • emittance, energy spread, but not bunch length at the moment • Calibrate BPM-01 and BPM-02 against Q (procedure to develop by RF group)

  10. The rest of the Injector : Summary • Set DIP-01 and DIP-2 (dispersion suppression) • Thread beam through dog-leg section (coarse) • Set dog-leg section (fine); dispersion suppression • Match the beam to main linac • perhaps beam size and position only • Beam measurements • probably, need none at the energy recovery stage

  11. LINAC to ARC 1 • Beamline setup • Linac setup

  12. ARC 1 • 180 deg. bend condition • Symmetric optics in the arc • Cancellation of dispersion at the ARC1 exit • will not be easy without BPMs; • fine tuning may need to be left for later • R56 control (cancellation) • not now ! • Sextupole tuning • again, better be left for later

  13. ST2 & ST3 • Get the beam to OTR-01 (ST3) • no viewers over ~8m distance !! • beam divergence after the chicane is not too large • hence try to catch the beam on OTR-01 (ST3) without quads • Check dispersion in ST3 • use OTR-01 • Estimate an energy spread on OTR-03 (ST2) • Measure Twiss parameters at the entrance to the ARC2

  14. ARC 2

  15. STR 4 DO NOT TOUCH !!! • 1. Get beam to OTR-2 • try it with all quads OFF (by~ 60m on OTR-02) • use VCOR-02 (ARC2) and DIP-03 (ARC2) • set beam size on OTR-02 : beta ~ 6m (x) and ~10m (y) (quads to nominal; adjust if necessary) • 2. Get beam to OTR-01 (ST1) • do not touch DIP-03 • remember the hole in OTR-01 ! • centre the beam on OTR-01 (ST1) • use HVCOR-02 • note corrector settings for the beam symmetric wrt the OTR centre • set the average current in the correctors • 3. Get beam to OTR-02 (ST1) • scan HVCOR-02 (ST4) – remember the hole ! • do not use HVCOR-01 (ST1) – Setup for 8MeV beams !!!

  16. Energy Recovery • AIMS: • get 180 degrees phase difference between the outcoming and incoming beams • catch the beam in the dump • HOW: • move the ARC1

  17. Call the big boss Open champagne

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