Noteable events list for d2n

Experiment Changes

Beam Pass Changes

• February Media:Feb_beam_energy.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 +
  • 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: seive 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 attenuuator added to photon signal going into DAQ
  • 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