Log entry time 10:41:39 on November 06, 2008

Entry number 247132

This entry is a followup to: 247094

Summary

1. Spin Flip is working now:
2. Spin Signal is stable. Read in from DAQ is OK. Scalar seems fine.
3. AFP Loss is at a steady rate of 1%(abs.) per flip for the first 6 flips. Though correction coil, which would reduce the loss is OFF.
4. Pol. Dropped from 48% -> 41% after 10 flips
5. One stepper motor controller error. Probably due to communication delay. Just click "Clear Error" to recover
6. Flip #31-40 = AFP Loss Test for No correction coil, 220C. Loss = 1.6%/Flip
7. Flip #41-50 = AFP Loss Test for correction coil @ (Large = 0.52A; Small = 0.52A), 220C. Field started slow drifting 1% higher since flip # 39 to flip # 50, which make the test meaningless.

Time Line

• 3:40  Fill N2 50 psig

• 3:44  call for 2uA
• 3:47  run 2905, N2 Dilution factor, 324K Evt
• 3:47  run 2906, N2 Dilution factor, 261K Evt
• 3:47  run 2907-2909, N2 Dilution, Alex is testing RICH on LHRS 
• Wait Wait & Wait ....
• 5:00  The Hot wires which bring both spin signal to logical 1 state is removed. Spin signal to DAQ is now controlled by NMR signal.
• 5:09  Target -> He3 & Depressurlize ref cell to 0 psig
• 5:12  NMR Frequency Sweep Test. Parameter needed for spin flip is correct. 
• 5:15  Started Spin Flip system. 
• 5:16  Flip Spin from Trans - to Trans +

• 5:28  He3 Run # 2919. Start at Spin +  -> 1.5M

• 6:10  Start Run 2920 along with HAPPEX run 30376 -> 2M
• 7:05  Start Run 2921 along with HAPPEX run 30377 -> 2M
• 7:50  Start Run 2922 along with HAPPEX run 30378 - > .6M
• 8:48  Beam down. Status Report
• 8:50  Before Flip # 12 Set to 2 min /flip
• 8:59  Before Flip # 14 Set to 1 min/flip
• 9:13  Stop Auto Spin Flip; Ready for correction coil test.
• 9:25  Pumping Laser off
• 9:26  Lock Spin signal to DAQ to spin up state 
• 9:29  1 flip confirm spin rised .5% (31.5%->32.0%) after 12min (9:13-9:25) pumping.
• 9:47  No correction coil, no laser AFP test. Start from Flip #31
• 9:57  Stop auto flip, No correction coil @ flip 40.
• 10:02  correction coil @ (Large = 0.52A; Small = 0.52A), no laser AFP test. Start from Flip #41
• 10:12  Stop auto flip, correction coil ON @ flip 50.
• Start 9:56. Holding filed strenth keep rising. It's 1.65% higher at 10:30 than that of 9:30. The Polarization is mostly destroyed.