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Commissioning August & September

This document outlines the commissioning agenda for August and September, detailing a schedule of presentations and discussions. Key topics include an overview of controls, data acquisition software, RF systems, machine protection, magnets, lasers, cryogenics, injectors, diagnostics, and vacuum systems. The agenda also emphasizes the importance of adhering to strict time limits for each speaker. Additional notes address critical processes such as beam conditioning, setting parameters for optimal performance, and the importance of beam measurements along the injector and accelerator components.

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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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