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.

Pair-spectrometer threshold calibration with beam

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

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).

• 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, 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 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).

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