September 7, 2011

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Wednesday Run Plan

  • Tune up beam
  • During this time, as much as possible tune up daq timing
  • Kicker magnet calibration with viewscreen
  • Pair spectrometer checkout/debugging
    This should include setting thresholds, studying rates with air converter, looking at rates with photon hole open
     versus blocked, ...
  • Check detector rates with D2O. See if we can get a good time of flight spectrum.


Kicker magnet calibration with viewscreen

Pair-spectrometer threshold calibration with beam

By using analog counter. Beam On. Dump out. Collimator Open. Radiator in (10 um Al).

Thresh upstream beam collim 090711.png Thresh downstream beam collim 090711.png


By using analog counter. Beam On. Dump out. Collimator Open. Radiator in (10 um Al).

was not done


By using TDC to count PS pulses (10,000 beam pulses). Beam On. Dump in. Collimator Open. Radiator in (10 um Al).

Thresh upstream beam collim TDCdata 090711.pngThresh downstream beam collim TDCdata 090711.png

  • upstream PS: 150 mV threshold, 545 cnts/10,000 beam pulses
  • downstream PS: 150 mV threshold, 476 cnts/10,000 beam pulses


By using TDC to count PS pulses (10,000 beam pulses). Beam On. Dump in. Collimator Open. Radiator out (10 um Al).

  • upstream PS: 150 mV threshold, 74 cnts/10,000 beam pulses
  • downstream PS: 150 mV threshold, 101 cnts/10,000 beam pulses

By using TDC to count PS pulses (10,000 beam pulses). Beam On. Dump in. Collimator blocked (see lab log books). Radiator in (10 um Al).

  • upstream PS: 150 mV threshold, 19 cnts/10,000 beam pulses (19/545 -> about 96.5% of beam is coming trough collimator!!!)
  • downstream PS: 150 mV threshold, 18 cnts/10,000 beam pulses (18/476 -> about 96.2% of beam is coming trough collimator!!!)


By using TDC to count PS pulses (10,000 beam pulses). Beam On. Dump in. Collimator blocked (see lab log books). Radiator out (10 um Al).

  • downstream PS: 150 mV threshold, 20 cnts/10,000 beam pulses. About the same as previous, thats good


By using TDC to count PS pulses (10,000 beam pulses). Beam Blocked. Dump in. Collimator blocked (see lab log books). Radiator out (10 um Al).

  • downstream PS: 150 mV threshold, 0 cnts/10,000 beam pulses.

Summary for 150 mV threshold

Beam Dump magnet Collimator Radiator Threshold Counts
upstream/downstream On In Open In 150 mV 545/476
upstream/downstream On In Open Out 150 mV 74/101
upstream/downstream On In Upstream blocked w/ 2" Al Out 150 mV 43/*
upstream/downstream On In Upstream blocked w/ 4" Al Out 150 mV */*
upstream/downstream On In Blocked In 150 mV 19/18
upstream/downstream On In Blocked Out 150 mV */20
upstream/downstream Blocked In Blocked Out 150 mV */0