Noteable events list for d2n

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Beam Pass Changes

  • February

Feb beam energy.png

  • March

March beam.png

Major Changes

  • 02/05/09
    • 18:05: 3He cell SAMANTHA and reference cell GMA installed
  • 02/07/09
    • 18:43-21:52: BB CAMAC crate down
    • 22:29: BB TDC delay cables fixed(~360ns)
    • 22:29: BB Cer output widths on discriminator set to 100ns
  • 02/08/09
    • 15:39: Oven temp controller replaced
    • 16:00: DAQ set to 1DAQ
    • 17:50: Ethane/Argon mix on pressure regulator at 1psi
  • 02/09/09
    • 17:03: BB MWDC gas system pressures returned (Ethane/Argon)
  • 02/10/09
    • 06:51: LHRS polarity set to positive
    • 09:44: BB sieve in
    • 10:29: BB Wire Chamber thresholds changed C1=3.9V,C2=4.8V,C3=4.8V
    • 11:17: T6:threshold_BB -s BB_Sh -120mV->450MeV
    • 11:17: T1:threshold_BB -s BB_Sh_2 -80V->300MeV
    • 11:31: PMTs put in flash ADCs
    • 14:10: sieve out
    • 14:16: PMTs back in V792 ADC
    • 16:35: RHRS DAQ restored for pvdis parasites
    • 17:55: BB T1,T6 thresholds set to -10mV
    • 18:15: BB polarity set to positive
    • 19:08: BB sieve in
    • 20:18: Threshold for BB_Sh=-0.120V BB_Sh_2=-0.080V BB_cer=-0.070V
    • 20:58: BB Cer T2 timing,outputs of AND units normalized to 150ns
    • 20:58: BB Cer T2 timing, output of P706 shortened to 50ns
    • 21:33: Compton HV = -1800V
  • 02/11/09
    • 03:25: Sieve out
    • 08:20: BB and LHRS polarity changed to negative
    • 09:56: DAQ put in 2DAQ mode
    • 09:58: T3 T4 trigger cables unplugged from BB
    • 11:17: 0.3x attenuator added to photon signal going into Saclay DAQ (Compton)
    • 15:18: BB MWDC threshold change
      • front = 3.898
      • mid = 4.800
      • back = 4.800
    • 22:56: Sync problems in ROC4, slot 18 (1875 TDC) missing gates in buffer mode
  • 02/12/09
    • 8:30: North Linac access
    • 12:01: Cell MOSS prepared
    • 14:54: LHRS FrontEnd Busy set to 60us
    • 16:17: Changed scintillator HV by 10%
    • 16:47: Trigger Latch Pattern Map updated
    • 17:52: ADC data ready wait loop changed from 1000 to 10000
  • 02/13/09
    • 20:47: BB Cer 1pe adjusted to 50mV
    • 21:15: BB cer signals moved to chan 32-63 of 1881 ADC in ROC8 slot 9
    • 22:05: BB disc. group signal now 30ns(signal that is AND with shower)
    • 23:02: shift BB retime L1A by 25ns
    • 23:41: Hole in T6 trigger
  • 02/14/09
    • 00:24: BB_sh T6 thresh -80mV
    • 00:47: Removed T1 from BB datamon
  • 02/15/09
    • 08:24: BB shower summing module overloaded, moved summing module to new crate
    • 08:24: Disc. of T1 shower sum #16 gets no signal
    • 08:24: T1 trigger on shower sum #19 flaky cable
  • 02/16/09
    • 01:06: T6 threshold set to -120mV
  • 02/17/09
    • 01:35: Controlled access for magnet
    • 12:20: 20ns added to BB cer group timing at shower group AND for T2
    • 12:28: PMTs 1--8 and 11--18 split between 1881 and FADC
    • 19:02: Replaced bbps1 portserver
    • Runs 1510-1512 had some MWDC HV turned off
  • 02/18/09
    • 15:06: Access to fix Moller quad
  • 02/19/09
    • 13:26: BB T6 thresh = -133mV
  • 02/20/09
    • 09:20: BB in Buf mode
    • 14:05: Moved bbsfi2, bbsfi3 to their own network switch and port
    • 14:58: Preshower sum input line swapped for left and right
    • 23:23: BB in Buf FADC mode
  • 02/27/09
    • 07:17: HV for channel bbps1:2002 S10, L10.0 was off Turned it on (affects run 1861-1882)
    • 21:37: It turns out that bbps1:2002 S10, L10.0 was supposed to be off. I turned it back off after Run 1882 finished.


  • 03/01/09
    • 03:56: Adjusted T2 arrival time at TS
    • 03:56: 27 4ns cables added between PSh disc. and P758
    • 03:56: T1 plugged back into TS
    • 06:07: T2 delay taken out
    • 22:18: Lasers off
    • 23:15: CHL trip
  • 03/02/09
    • 13:53: Left dipole changed to positive polarity
    • 19:27: BB power supply water leak
    • 19:40: BB set ot 710A
  • 03/03/09
    • 10:53: C4F8O BB Cer swapped
    • 12:09: BB_Sh, BB_Sh2 set to -110
    • 18:23: RICH gas supply changed from methane to UHP grade Nitrogen
  • 03/04/09
    • 08:02: LHRS polarity changes
      • Q1 = negative
      • Q2 = positive
      • Q3 = negative
      • Dipole NMR = N
  • 03/05/09
    • 12:49: Arc magnet problem
  • 03/06/09
  • 03/07/09
  • 03/09/09
    • 10:41: BB & LHRS changed to positive polarity
    • 11:13: PMTs 9/10 bypass first amplifier
    • 11:208: T1 threshold set to -20mV
    • 17:02: PSh/Sh set to OR T6 cosmics
    • 20:38: PSh/Sh set to AND T6 back to Sh AND PSh
    • 22:02: PSh/Sh set to OR T6 cosmics
  • 03/10/09
    • 01:33: PSh/Sh set to AND T6 back to Sh AND PSh
  • 03/11/09
    • 11:22: BB set to negative polarity
    • 14:23: PSh/Sh set to OR T6 cosmics
  • 03/12/09
    • 22:33: PMTs 9/10 put back into double amplifier
  • 03/13/09
    • 08:10: LHRS set to negative polarity
  • 03/14/09
    • 08:30: 3He oven base went down
    • 17:31: Base heater voltage reduced 140V->125V and air flow raised 220->300
  • 03/15/09
    • 02:16: BB Sh threshold set to -20mV
    • 02:47: BB Sh threshold set to -110mV
    • 20:40: BB set to positive polarity
  • 03/16/09
    • 08:44: BB set to negative polarity
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