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MINERvA PMT Test Stand: Improved

MINERvA PMT Test Stand: Improved. George S. Tzanakos Physics Department, University of Athens, Greece. Goal: Build a Test Stand that can test and characterize 10 PMTs. Assumptions about MINERvA Electronics: PMT Test Stand can be supported with 704 (=11 x 64) channels of ADCs

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MINERvA PMT Test Stand: Improved

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  1. MINERvA PMT Test Stand: Improved George S. Tzanakos Physics Department, University of Athens, Greece • Goal:Build a Test Stand that can test and characterize 10 PMTs. • Assumptions about MINERvA Electronics: • PMT Test Stand can be supported with 704 (=11 x 64) channels of ADCs • DAQ rate 500 Hz • Integration Time = 12 s G. Tzanakos, MINERvA Collaboration Meeting, Jan 14, 2006

  2. HV cables 11 PMTs HV controller Multiplexer Stage Controller Stages-Filter Wheel special protocol LED pulser TCP/IP signal cables Trigger Unit SCSI bus VME bus MINERvA Electronics (ADCs) G. Tzanakos, MINERvA Collaboration Meeting, Jan 14, 2006

  3. The same pixel in each PMT Diffuser from LED 8x8 positions 11 PMTs per batch 64 bundles of 11 fibers Top view of multiplexer x,y,z stages G. Tzanakos, MINERvA Collaboration Meeting, Jan 14, 2006

  4. DARK COUNTS: 1 sec  500 windows of 12 s  0.006 s of live time 1hr  21.6 s live time, For a DC rate of 250Hz  5400 DC total Assume a 0.5 hr collection  2700 counts total  42 counts/channel OPERATING HV 5 HV settings (-750, -800, -850, -900, -950 ), 64 positions, 5000 pulses/ position, 5 sec movement time, HV Settling  64pos x (5+5HVs x(5+5000/500)) = 1.42 hr  1.5 hrs (Oxford: 5 hrs) G. Tzanakos, MINERvA Collaboration Meeting, Jan 14, 2006

  5. Single pe Response, Gain uniformity, Linearity, Xtalk V0. 12 filters, 64 positions, 10000 light pulses per setting  64x(5+12x(5+10000/500)) = 5.4  5.5 hrs V1. 3 HVs, 12 filters, 64 positions, 10000 light pulses per setting  64x(5+3x(5+12x(5+10000/500))) = 16.4  16.5 hrs V2. 5 HVs, 12 filters, 64 positions, 5000 light pulses per setting  64x(5+5x(5+12x(5+5000/500))) = 16.5  16.5 hrs V3. 5 HVs, 8 filters, 64 positions, 5000 light pulses per setting  64x(5+5x(5+8x(5+5000/500))) = 11.2  11 hrs (Linearity) 64x(5+10000/500) = 0.44 0.5 hrs (Xtalk). Total = 11.5 hrs V4. 3 HVs, 8 filters, 64 positions, 5000 light pulses per setting  64x(5+3x(5+8x(5+5000/500))) = 6.8  7 hrs 64x(5+10000/500) = 0.44 0.5 hrs (Xtalk). Total = 7.5 hrs (Assumed:Settling time = 5 s for each: a)x-y-z pos b) filter c) HV ) G. Tzanakos, MINERvA Collaboration Meeting, Jan 14, 2006

  6. Assume: • 4 hrs preparation of new batch and processing of previous batch • 4 hrs for PMT settling • 1 cycle of testing (21 hrs) • 1.5 hrs to repeat HV setup and verify gain stability Additional time = 4+4+ 1.5 = 9.5 hrs  GRAND TOTAL = G. Tzanakos, MINERvA Collaboration Meeting, Jan 14, 2006

  7. Justification • HV:Setup HV for fixed gain • Dark Counts:verify smooth behaviour, see DC single pe pulse • Gain:Stability, pixel-to-pixel uniformity • Xtalk:Measure to use later in MC simulation of each PMT • Linearity vs HV:correct data for non-linearities G. Tzanakos, MINERvA Collaboration Meeting, Jan 14, 2006

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