Presentation on theme: "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."— Presentation transcript:
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 TBC 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
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 ?
7 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 Twiss parameters Emittance Slit here Energy spread/spectrum Absolute energy Buncher gradient / phase setting Bunch charge Setting achromatic condition (Q01-Q05) Twiss parameters Energy spread Setting achromatic condition (Q10, Q12)
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
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
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