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Upgrade Plan for Electronic Efficiency and Resolution at General Meeting

Discussion at the KLOE General Meeting on 10-11 October 2002 regarding the current efficiency and resolution of electronic components, issues with electronic noise, future intervention plans, PM test and selection, and the replacement of photomultipliers. Evaluation of MIP detection efficiency, electronic upgrades, and background occupancy. The plan includes improvements in signal amplitude, noise reduction, and potential redesign of FE electronics.

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Upgrade Plan for Electronic Efficiency and Resolution at General Meeting

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  1. QCAL upgrade plan E. Santovetti KLOE General meeting 10-11 October 2002 • Current situation • Efficiency, resolution, Background occupancy • Electronic noise • Future intervention • PM test and selection • Replacement of ~ 10 PM • Electronic upgrade

  2. Efficiency MIP detection Efficiency vs ch (efficiency of the single channel !) Average ch. efficiency = 97 % Actual detection eff. > 99 % Photon efficiency from KL +-0 (70 MeV) ~ 85 % QCAL A QCAL B E. Santovetti KLOE GM 10-11 October 2002

  3. MIP signal amplitude MIP signal amplitude vs ch # After HV equalization the response remains very inhomogeneous The Magnetic field (5.2T) reduces the signal amplitude by 60% ADC counts bad PM ch. number E. Santovetti KLOE GM 10-11 October 2002

  4. QCAL B Ch. 9 QCAL A Ch. 9 E(MeV) E(MeV) QCAL A Ch. 8 QCAL B Ch. 11 E(MeV) E(MeV) MIP signal amplitude/2 bad channel The threshold (3 or 50 ADC counts) cuts evidently the signal ! good channel E. Santovetti KLOE GM 10-11 October 2002

  5. Efficiency 1-eff. Efficiency and signal amplitude show a clear correlation 1/Amp. (ADC ch-1) E. Santovetti KLOE GM 10-11 October 2002

  6. Background and time resolution (from KL +-0 events) Time resolution for photons ~ 2.4 ns Background occupancy ~ 0.3 ( t = 200 ns, all QCAL) Dt (ns) E. Santovetti KLOE GM 10-11 October 2002

  7. Electronic noise The electronic noise is very high ! correlated with the magnetic field ADC affected low frequency (few MHz) correlated with the machine TDC and ADC affected higher frequency EMC level E. Santovetti KLOE GM 10-11 October 2002

  8. Future plan Replacement of the worst (~ 10) photomultipliers - preliminary test to check if there is an improvement Replacement of the all 32 HV divider - HV decupling capacitor in the divider Possible redesign of the FE electronics - differential amplifier (lower noise) ? E. Santovetti KLOE GM 10-11 October 2002

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