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| == Commissioning run plan == | | == Commissioning run plan == |
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− | === 1st order run plan, Commissioning Part (07/18/2008, Xiaodong Jiang) ===
| + | [[Transversity Run Plan 1st Order#Commissioning Part|1st order run plan, Commissioning Part]] |
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− | <pre>
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− | 0. Beam delivery, one pass beam, initial checks.
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− | Start up conditions:
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− | HRS_L at 16 degree, negative mode, P_HRS=xxx.xx GeV/c
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− | BigBite at 30 degree, 1.5 m drift (target to front surface of
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− | BigBite magnet), 710 A current.
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− | Beam tuned through Compton magnets.
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− | Compton detector initial check.
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− | Harp scan require that beam sigma_x: 100~200 micron, sigma_y:100~200 micron.
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− | Check lumi-monitors, beam position monitors, beam charge monitors.
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− | HAPPEX feedback working.
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− | Moller run.
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− | check beam steering by BigBite magnet.
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− | Target cell alignment check. Move beam around (through grid locations on BPMA and BPMB)
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− | and check detctor rates.
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− | --------------------------------------------------------------------------------------------------------
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− | 1. One pass beam, E0=1.234 GeV, polarized, 5 days total.
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− | HRS_L@16 degree, negative mode, quasi-elastic kinematics, P_HRS=xxx.xx GeV/c
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− | i, Carbon hole targets beam-target alignment check, HRS singles.
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− | Verify that beam goes through middle of holes on carbon targets.
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− | ii, HRS_L single arm detector shakedown, carbon multi-foil target.
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− | RICH, A1, Gas Cherenkov, S2M and Leadglass blocks. Check DAQ, HRS scalers,
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− | iii, HRS_L sieve slit runs, carbon multi-foil target, double-check optics (optional).
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− | iv, HRS@16 degree, He3 delta-production kinematics, P_HRS=xxx.xx GeV/c
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− | a. Carbon multi-foil run.
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− | b. Pol. He3 target, transverse in-plane polarization, transv. asy.
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− | at delta-production measurement.
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− | c. tests of target spin flip while in step-b.
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− | v. HRS@16 degree, He3 elastic kinematics, P_HRS=xxx.xx GeV/c.
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− | a. Rotate target to Long., Pol. He3 elastic Asymmetry calibration.
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− | b. Reference cell run, He3 pressure curve. Run He3 gas 20~130 psi.
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− | c. Reference cell N2 runs, with different gas pressure, 20~130 psi..
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− | At the same time, BigBite at 30 degree, 710A magnet current,
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− | i, detector shakedowns, carbon multi-foil targets.
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− | Wirechambers, gas Cherenkov, preshower+shower, scintillators.
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− | Wirechamber HV scan, threshold scan.
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− | ii, check beam helicity sorted scalers, synk-check of HRS and BigBite scalers.
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− | iii, check Lumi-monitors. Synk-check of Lumi and BigBite scalers.
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− | --------------------------------------------------------------------------------------------------------
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− | 2. One pass beam, E0=1.24 GeV, polarized, HRS@58.1 degree in positive
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− | mode, P_HRS=0.62. BigBite at 30 degree, 710 A current.
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− | i. Carbon multi-foil run.
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− | ii, H(e,e'p) coincidence run, with reference cell H2 gas ~130 psi. I~15 uA.
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− | Check coincidence trigger. Coin. Time-of-flight, S2M t0 offsets.
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− | Beam RF timing signal check.
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− | Expected T5 rate is roughly:xxx.xx Hz.
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− | iii, change BigBite magnet current (in 20% steps to ~20% of Max.) to have
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− | elastic electron event spread over several rolls of blocks.
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− | Shower+preshower
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− | hardware gain adjustement. Sotfware gain calibration.
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− | Check trigger thrshold.
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− | iv, BigBite sieve slit run, H(e,e') single arm, with Coin T5 taken at
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− | the same time. This provide one set of optics calibration at
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− | E'=1.05 GeV for BigBite.
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− | v, While BigBite sieve slit in, take one run with carbon multi-foil target, BigBite field off.
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− | -------------------------------------------------------------------------------------------------------
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− | 3. Two pass beam, E0=2.400 GeV, un-polarized, HRS@46.1 degree in
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− | positive mode, P_HRS=1.25 GeV/c.
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− | i. Carbon multi-foil run.
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− | ii, H(e,e'p) coincidence, with reference cell H2 gas ~130 psi. I<15 uA.
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− | Expected T5 rate is roughly:xxx.xx Hz.
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− | iii, Change BigBite magnet current (in 20% steps to ~20% of Max.) to have
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− | elastic electron event spread over several rolls of blocks. for sotfware
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− | gain calibration around E'=1.80 GeV.
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− | Check trigger thrshold.
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− | | + | |
− | iv. BigBite sieve slit run, H(e,e') single arm, with Coin T5 taken at
| + | |
− | the same time. This provide one set of optics calibration at
| + | |
− | E'=1.80 GeV for BigBite.
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− | | + | |
− | v, While BigBite sieve slit in, take one run with carbon multi-foil target, BigBite field off.
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− | --------------------------------------------------------------------------------------------------------
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− | 4. E0=5.900 GeV, polarized beam, pre-production check out (1 day).
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− | i, Beam tune through Compton magnet, Compton detector commisioning.
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− | ii, Moller run.
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− | iii. Beam position vs BigBite background rate check.
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− | iv. Coincidence trigger check, P_HRS=-2.4 GeV/c NEGATIVE mode, at 16 degree.
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− | Software check for coin-tinme of flight corrections.
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− | With enough confidence, shrink TOF window from 100 ns to ~60 ns(?)
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− | v. Pol. He3 target, transvers in plane polarization, spin-flip check.
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− | The DAQ goal is to take at least 1 kHz (100 Hz coin.+900Hz
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− | singles)
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− | with 90% live time,
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− | </pre>
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| | | |
| == Production run plan == | | == Production run plan == |
| | | |
− | === 1st order run plan, Production part (07/18/2008, Xiaodong Jiang) ===
| + | [[Transversity Run Plan 1st Order#Production part|1st order run plan, Production part]] |
− | | + | |
− | <pre>
| + | |
− | | + | |
− | 5. Production, target transverse polarized, in-plane and verticle.
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− | With reference cell runs in between, H2 gas 130 psi, N2 gas 130 psi.
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− | 6. Around Thanksgiving, change target cell.
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− | 7. Production, target transverse polarized, in-plane and verticle.
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− | With reference cell runs in between, H2 gas, N2 gas.
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− | 8. Complete data taking, switch over to d2n, change cell, with Long.
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− | target polarization setup.
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− | 9. One pass beam again, polarized, He3 elastic asymmetry calibration.
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− | 10. d2n production ...
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− | | + | |
− | </pre>
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| == Switch over to d2n == | | == Switch over to d2n == |