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HBD Commissioning Report

HBD Commissioning Report. Itzhak Tserruya, March 26, 2007. Data. HBD is timed in. Whenever there was beam the HBD has taken data. Two large data sets were taken at FB and RB both at HV=3600V for a first assessment of gain and performance.

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HBD Commissioning Report

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  1. HBD Commissioning Report Itzhak Tserruya, March 26, 2007

  2. Data • HBD is timed in. • Whenever there was beam the HBD has taken data. • Two large data sets were taken at FB and RB both at HV=3600V for a first assessment of gain and performance. • We made a coarse scan of the transition from FB to RB. • We took last night two sets of data at FB and RB with higher HV at 3650V.

  3. IPE D ED (+) G ET T pA G T ET G I EI Hadron Blindness: FB and RB At slightly negative ED, photoelectron detection efficiency is preserved whereas charge collection is largely suppressed.

  4. On-line monitoring and data analysis • First version of on-line monitoring is already in use. Will need a couple of iterations for polishing. • For an efficient commissioning of the detector, the data have to be analyzed quickly: • Analysis code is operational • We got enough computing power • First results are already available and encouraging

  5. HBD response to Hadrons in FB Run 226502 ES4 at 3600V FB Hadrons selected in central arm projected onto HBD Estimated gas gain: (assuming a primary charge of 19e in the 1.5mm drift gap and a conversion of 10 ADC counts/fC) G = 2900!! Much higher than expected

  6. First look at electrons in FB Run 226502 ES4 at 3600V FB Electrons selected in central arm projected onto HBD Clear difference with the hadron response but not yet ready to quantify

  7. On our TDL • use access on March 28 to replace resistors in a few modules. • Determine the gain and fix operating conditions on each module. • So far we have mainly used the East arm and occasionally a few modules from the West arm.

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