ASIC design optimizations
Planned tests
- High Voltage plateau === done
Gas: Ar-CO2 87%-13% gas mixture. Setup: the signal after the shaper was inverted and fed to a discriminator. The HV was changed and the signals above threshold where counted (normalized to 100s measure time). The result:
Below galleries of pulses are shown for different HV (on the left channel 2, on the right channel 15) -- remember everything above 1V is an overflow on the fADC, also the b/w traces are taken with infinite persistence, the colored ones with 10 s persistence:
- 1600 V
- 1650 V
- 1700 V
- 1750 V
- 1800 V
- 1850 V
- 1900 V
- 1950 V
- 2000 V
- (absolute) Gas gain as a function of High Voltage
Source measurement using Sr-90 (e-) or 55-Fe (X-rays) (if we have it) / or using cosmic rays? -- Estimated time: 1 day -- if we have a good source
- Dynamic range + amplitude distributions
1 week measure with horizontal chamber + 1 week measure with tilted chamber. For amplitude distributions we need to have modified shapers. -- Estimated time: 2 weeks
- Collection of gallery of pulses
I found 4 pulse galleries, measured directly after the pre-amplifier made by Gerard when he was here, they are shown below: