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Closing the Loop on ND vs FD

Closing the Loop on ND vs FD. We will measure p , p, e response spectra for ND and FD electronics How do differences between CALDET and Near and Far detectors affect calibration E.g. – light level Is it worth trying to understand response in terms of low-level electronics response?.

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Closing the Loop on ND vs FD

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  1. Closing the Loop on ND vs FD • We will measure p, p, e response spectra for ND and FD electronics • How do differences between CALDET and Near and Far detectors affect calibration • E.g. – light level • Is it worth trying to understand response in terms of low-level electronics response?

  2. Detector Response • Response to an energy distribution can be characterized as • Channel energy deposition distribution for type of interaction • Mip, EM shower, Hadronic shower • Same for ND, FD, but not know without bias of one or the other • Mean PE per channel energy (channel by channel) • Measurable with standard MINOS techniques • Electronics response difference? • Measured by LI, but will we fit little wiggles?

  3. MINOS analysis of ADC/PE and PE/MIP • ADC/PE “unbiased” • statistical treatment gives underlying mean PE • Data for ADC/PE taken with no readout suppression • Muon Calibration: • Mean response (with corrections) to muons. Threshold effects at low light levels?

  4. MIP distribution for electrons in ND, FD electronics • True energy distribution not known with great precision • Measurement biased by lightlevel, electronics • These measured distributions differ mostly due to light level, but also threshold effects • It would be hard to use these distributions to model ND/FD response difference

  5. Possible approach to caldet crosscheck • For “less biased” measure of shower channel energy distributions… • can we increase PEs/MIP in CALDET vs Near and Far detectors? • Can we run at all with lower thresholds at CALDET? (no?) • Does it really matter? By definition, low energies are involved. • Map ND and FD response with teststand system • Similar to studies Nicolai Tobien and P.S. did for QIE • Laser/POPOP/WLS to illuminate PMTs • No readout suppression • High linearity PIN diode with 20-bit ADC for reference

  6. Teststand possibility • Fermilab Lab-5 teststand • Readout of QIE via CAMAC • Possible (in principle) to read out small number of FD channels • If we can get them… • Good summer student project with a post-doc to supervise?

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