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Near Detector Electronics Performance

Near Detector Electronics Performance. Previous Studies Preliminary Results from Caldet. Previous Studies. QIE Performance studies presented at April, 2002 review Detailed studies of 2 QIEs with M64 PMT http://home.fnal.gov/~shanahan/minos/ndfe_rev.pdf Argonne Teststands-

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Near Detector Electronics Performance

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  1. Near Detector ElectronicsPerformance • Previous Studies • Preliminary Results from Caldet

  2. Previous Studies • QIE Performance studies presented at April, 2002 review • Detailed studies of 2 QIEs with M64 PMT • http://home.fnal.gov/~shanahan/minos/ndfe_rev.pdf • Argonne Teststands- • Development of system, performance studies, calibrations, preparation for Caldet

  3. Caldet 150 Channels of Near Detector Electronics • 6 planes out of 60 on one side • T11 Beamline from Sept. 7 – Sept. 15, 2002 Time of Flight Cerenkov (not to scale)

  4. Caldet Run • Several factors beyond scope of Nominal ND running • High rate dynode trigger running • External triggering • Timing issues between ND and FD electronics • ND system performed extremely well • System of 150 channels ran smoothly for 1 week of production running with very few errors.

  5. Beam events overlap pedestal data Pedestal Seconds (spans week of running) Stability Studies – Dave Reyna Pedestals stability throughout Caldet run All channels, all pedestal measurements Single channel history Some small pedestal drift with time (temperature?), but only on order of 1% of a PE

  6. Stability Studies, cont. • Calibration stability over run of 1 week: • Measure response with charge injection, relative to calibration Single channel ratio of calibrated response, end of run over beginning of run (1 week) Fit point All channels, all measurements Calibration is extremely stable: 0.05% mean, 1% rms Response ratio

  7. Preliminary Caldet Electron Analysis • Electron cuts a la Trish: • Cerenkov ADC, TOF-Cerenkov timing, max energy near center of plane 1, etc. • 3 GeV/c electrons, run 31265 Near MIPs Far MIPs

  8. Caldet Electron Analysis, cont. • Not all runs are as nice as 31265… • 2 GeV/c electrons in 31398…. • Low response events (below 20 MIPs) common to both sets of electronics Near MIPs Far MIPs

  9. “Linearity” • ND and FD responses track each other well, despite obvious problems with electron selection • Worst case: 5% disagreement, but less than 2s effect • Typically 2-3% agreement

  10. “Resolution” • Less agreement than response plot • However, RMS is more susceptible to a handful of outliers • Effects of “missing” plane 6 as function of electron energy… • Not a source of concern at this time Electron response RMS as % of response

  11. Channel Correlation • Study individual strip Near-Far response in MIPs • Combine several strips for statistics • Mostly within 2% • There will be different threshold effects between the ND and FD in lowest bin (ND-FD)/.5(ND+FD) 2 PEs or less in 1st bin (nd+fd)/2 in PEs

  12. Channel Correlation, cont. Expectation • Test: is s(ND-FD) consistent with photostatistics? Observed RMS ~20% difference is to be expected due to secondary emission statistic - comparison looks reasonable Ratio of observed over expected RMS

  13. To Do • Some performance tests remaining at Argonne • E.g. dynode discriminator sensitivity • Caldet Analysis • Look at more runs! • Improve electron analysis • Mip efficiency studies • Light injection data – Liz Buckley-Geer • Production wouldn’t be held up for each of these…

  14. Summary • Near Detector Front End Electronics prototypes have been thoroughly tested in several environments • Argonne and Fermilab teststands • Caldet • 1 week of solid Caldet running showed system to be reliable and comparable to the FD in response • … with more work needed on analysis.

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