Log entry time 08:05:07 on February 09, 2012

Entry number 252960

Owl Shift Summary, 9 Feb 2012

Shift Crew:
SL: P. King
TO: A. Lee
Others:

Priorities for shift:

1. Production parity at high current.
2. Restore the low-current BCM6 instrumentation if it does not seem to cause the DD fluctuations

Summary of events:

• 00:05---Change IHWP states to (IN,OUT)
• 00:40---Turned off the scanner motion controller box.
• 02:38---Compton HV turned off by themselves.
• 03:26---Qtor tripped. Ramped up normally after resetting.
• 04:09---At the end of run 15900, we got a burst of missed helicity gates; there was a message in the ER window saying it was backed up. This happened at about the same time I was clearing disk space, so probably it was a transient problem with writing the data. The run was ended shortly after the burst of missed gates ended.
• 05:04---Compton HV turned off by themselves.
• 06:03---Reconnected the V/F instrumenation chain for the low-current BCM6 reciever. This was done between runs 15902 and 15903.
• 06:42---Pedestal run 15904 during the QE measurement.
• 07:50---Short burst of missed helicity gates in run 15906.

Run list:

• 15896: Production Parity IHWP==(in,out)
  Changed IHWP states. The initial charge asymmetry was good, so kept this run going.
• 15897: Production Parity IHWP==(in,out)
• 15898: Production Parity IHWP==(in,out)
• 15899: Production Parity IHWP==(in,out)
  Qtor tripped at the end of this run.
• 15900: Production Parity IHWP==(in,out)
  There was a burst of missed helicity gates toward the end of this run.
• 15901: Production Parity IHWP==(in,out)
• 15902: Production Parity IHWP==(in,out)
• 15903: Production Parity IHWP==(in,out)
  First run after reconnecting the BCM6 V/F instrumentation chain.
• 15904: Pedestal run IHWP==(in,out)
• 15905: Production Parity IHWP==(in,out)
• 15906: Production Parity IHWP==(in,out)

Coulombs acquired: 4.71 C

Typical operating parameters:

Problems requiring attention:

Analysis:

• 15896: Production Parity (BCMDD78 RMS = 63.2)
• 15897: Production Parity (BCMDD78 RMS = 61.2)
• 15898: Production Parity (BCMDD78 RMS = 63.2)
• 15899: Production Parity (BCMDD78 RMS = 62.9)
• 15900: Production Parity (BCMDD78 RMS = 63.0)
• 15901: Production Parity (BCMDD78 RMS = 64.7)
• 15902: Production Parity (BCMDD78 RMS = 63.9)
• 15903: Production Parity (BCMDD78 RMS = 62.8)
  First run after reconnecting the BCM6 V/F; notice the DD RMS got (slightly) smaller this time!
• 15904: Pedestal
• 15905: Production Parity (BCMDD78 RMS = 62.99)
• 15906: Production Parity (BCMDD78 RMS = 62.2)

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