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Spectrometric performance of Kurchatov Institute detectors

Spectrometric performance of Kurchatov Institute detectors. Detector 1. Problems: Detector not reaches the recommended voltage Detector has comparatively poor energy resolution Detector had a big cross-talk. Reasons: Detector has big leakage current

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Spectrometric performance of Kurchatov Institute detectors

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  1. Spectrometric performance of Kurchatov Institute detectors Gusev K., JINR

  2. Gusev K., JINR

  3. Detector 1 Problems: • Detector not reaches the recommended voltage • Detector has comparatively poor energy resolution • Detector had a big cross-talk Reasons: • Detector has big leakage current (even at 3700 V, I > 10-10A in my estimation) • Preamplifier electronics are not work correctly Possible solutions: • Change the preamplifier • Measure V-I characteristic of detector and choose the optimal voltage • Pump and maybe heat Gusev K., JINR

  4. Detector 2 Strange instability of peaks (doubling effect) Now this effect is absent “Wandering” = contact or electronic problems Leakage current at operation voltage is normal Gusev K., JINR

  5. Detector 3 Detector has poor energy resolution FWHM =3.0 keV Possible reason – big current (> 10-10A) Possible solution is similar to detector 1 Gusev K., JINR

  6. Detector 4 No problems! Gusev K., JINR

  7. Detector 5 Poor resolution (FWHM =3.05 keV), but leakage current is good Need further investigations Gusev K., JINR

  8. Conclusions • All detectors are prepared for work, all crystals are good but their spectrometric performance are not ideal (especially for detectors 1, 3 and 5) • For achieving the best performance of KI detectors we need: • Good measurement conditions; • Enough time for determination of various detector parameters (at least V-I characteristics); • Precision pulse generator; • Devices for pump and heat processes. • We have to make all available procedures before any other activities (such as repacking, etc.) Gusev K., JINR

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