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