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MPPC tests - Warsaw

MPPC tests - Warsaw. Michał Dziewiecki Robert Kurjata Robert Sulej Marcin Ziembicki. The Machine. Software. Running on single computer Full control of the device Data acquisition via Ethernet On-line data processing (10.5 MB/s) Automatic parameters calculation (gain, V br , …).

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MPPC tests - Warsaw

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  1. MPPC tests - Warsaw Michał Dziewiecki Robert Kurjata Robert Sulej Marcin Ziembicki

  2. The Machine

  3. Software • Running on single computer • Full control of the device • Data acquisition via Ethernet • On-line data processing (10.5 MB/s) • Automatic parameters calculation (gain, Vbr, …)

  4. Histograms fitting

  5. Measurements status • Processed till now: ≈600 pcs • ≈100 devices measured at multiple voltages • Finish: within next two weeks (huge throughput) • Some devices need to be tested once again (≈5%)

  6. Results – relative gain at Vop Calculations based on fft-filtered histogram Calculations based on gaussian fit

  7. Results – dark rate 0.5 (red) and 1.5 p.e (blue) dark rates for 570 sensors operating at nominal Vop Dark rates histogram

  8. Results – dark rate Warsaw vs Hamamatsu dark rate measurements Two method of dark rate measurement: using discriminator or sampling ADC

  9. Dark rate measured with discriminator Blue: dark rate estimated using ADC (only 3 batches) Results – PDE (some problems) Flasher settings were changed during measurements Integration time was changed PDE (with dark-rate-correction) for whole series Relative PDE histogram

  10. Gain & dark-rate vs voltage 0.5 p.e. Automatically calculated VBR 1.5 p.e. Gain vs Vop

  11. CT & AP • Necessary data is acquired • CT and AP rates are not calculated at the moment

  12. Thank you.

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