Difference between revisions of "ASIC design optimizations"
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|width="415pt"|[[Image:hv-1600-ch2.jpg|thumb|none|400px|Gallery of pulses of channel 2.]] | |width="415pt"|[[Image:hv-1600-ch2.jpg|thumb|none|400px|Gallery of pulses of channel 2.]] | ||
|width="415pt"|[[Image:hv-1600-ch15.jpg|thumb|none|400px|Gallery of pulses of channel 15.]] | |width="415pt"|[[Image:hv-1600-ch15.jpg|thumb|none|400px|Gallery of pulses of channel 15.]] | ||
| + | |width="415pt"|[[Image:hv-1600-amp-ch15.jpg|thumb|none|400px|Amplitude spectrum of ch 15 (counts versus amplitude in ADC channels, with shaper).]] | ||
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|width="415pt"|[[Image:hv-1650-ch2.jpg|thumb|none|400px|Gallery of pulses of channel 2.]] | |width="415pt"|[[Image:hv-1650-ch2.jpg|thumb|none|400px|Gallery of pulses of channel 2.]] | ||
|width="415pt"|[[Image:hv-1650-ch15.jpg|thumb|none|400px|Gallery of pulses of channel 15.]] | |width="415pt"|[[Image:hv-1650-ch15.jpg|thumb|none|400px|Gallery of pulses of channel 15.]] | ||
| + | |width="415pt"|[[Image:hv-1650-amp-ch15.jpg|thumb|none|400px|Amplitude spectrum of ch 15 (counts versus amplitude in ADC channels, with shaper).]] | ||
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|width="415pt"|[[Image:hv-1700-ch2.jpg|thumb|none|400px|Gallery of pulses of channel 2.]] | |width="415pt"|[[Image:hv-1700-ch2.jpg|thumb|none|400px|Gallery of pulses of channel 2.]] | ||
|width="415pt"|[[Image:hv-1700-ch15.jpg|thumb|none|400px|Gallery of pulses of channel 15.]] | |width="415pt"|[[Image:hv-1700-ch15.jpg|thumb|none|400px|Gallery of pulses of channel 15.]] | ||
| + | |width="415pt"|[[Image:hv-1700-amp-ch15.jpg|thumb|none|400px|Amplitude spectrum of ch 15 (counts versus amplitude in ADC channels, with shaper).]] | ||
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|width="415pt"|[[Image:hv-1750-ch2.jpg|thumb|none|400px|Gallery of pulses of channel 2.]] | |width="415pt"|[[Image:hv-1750-ch2.jpg|thumb|none|400px|Gallery of pulses of channel 2.]] | ||
|width="415pt"|[[Image:hv-1750-ch15.jpg|thumb|none|400px|Gallery of pulses of channel 15.]] | |width="415pt"|[[Image:hv-1750-ch15.jpg|thumb|none|400px|Gallery of pulses of channel 15.]] | ||
| + | |width="415pt"|[[Image:hv-1750-amp-ch15.jpg|thumb|none|400px|Amplitude spectrum of ch 15 (counts versus amplitude in ADC channels, with shaper).]] | ||
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|width="415pt"|[[Image:hv-1800-ch2.jpg|thumb|none|400px|Gallery of pulses of channel 2.]] | |width="415pt"|[[Image:hv-1800-ch2.jpg|thumb|none|400px|Gallery of pulses of channel 2.]] | ||
|width="415pt"|[[Image:hv-1800-ch15.jpg|thumb|none|400px|Gallery of pulses of channel 15.]] | |width="415pt"|[[Image:hv-1800-ch15.jpg|thumb|none|400px|Gallery of pulses of channel 15.]] | ||
| + | |width="415pt"|[[Image:hv-1800-amp-ch15.jpg|thumb|none|400px|Amplitude spectrum of ch 15 (counts versus amplitude in ADC channels, with shaper).]] | ||
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|width="415pt"|[[Image:hv-1850-ch2.jpg|thumb|none|400px|Gallery of pulses of channel 2.]] | |width="415pt"|[[Image:hv-1850-ch2.jpg|thumb|none|400px|Gallery of pulses of channel 2.]] | ||
|width="415pt"|[[Image:hv-1850-ch15.jpg|thumb|none|400px|Gallery of pulses of channel 15.]] | |width="415pt"|[[Image:hv-1850-ch15.jpg|thumb|none|400px|Gallery of pulses of channel 15.]] | ||
| + | |width="415pt"|[[Image:hv-1850-amp-ch15.jpg|thumb|none|400px|Amplitude spectrum of ch 15 (counts versus amplitude in ADC channels, with shaper).]] | ||
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|width="415pt"|[[Image:hv-1900-ch2.jpg|thumb|none|400px|Gallery of pulses of channel 2.]] | |width="415pt"|[[Image:hv-1900-ch2.jpg|thumb|none|400px|Gallery of pulses of channel 2.]] | ||
|width="415pt"|[[Image:hv-1900-ch15.jpg|thumb|none|400px|Gallery of pulses of channel 15.]] | |width="415pt"|[[Image:hv-1900-ch15.jpg|thumb|none|400px|Gallery of pulses of channel 15.]] | ||
| + | |width="415pt"|[[Image:hv-1900-amp-ch15.jpg|thumb|none|400px|Amplitude spectrum of ch 15 (counts versus amplitude in ADC channels, with shaper).]] | ||
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|width="415pt"|[[Image:hv-1950-ch2.jpg|thumb|none|400px|Gallery of pulses of channel 2.]] | |width="415pt"|[[Image:hv-1950-ch2.jpg|thumb|none|400px|Gallery of pulses of channel 2.]] | ||
|width="415pt"|[[Image:hv-1950-ch15.jpg|thumb|none|400px|Gallery of pulses of channel 15.]] | |width="415pt"|[[Image:hv-1950-ch15.jpg|thumb|none|400px|Gallery of pulses of channel 15.]] | ||
| + | |width="415pt"|[[Image:hv-1950-amp-ch15.jpg|thumb|none|400px|Amplitude spectrum of ch 15 (counts versus amplitude in ADC channels, with shaper).]] | ||
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|width="415pt"|[[Image:hv-2000-ch2.jpg|thumb|none|400px|Gallery of pulses of channel 2.]] | |width="415pt"|[[Image:hv-2000-ch2.jpg|thumb|none|400px|Gallery of pulses of channel 2.]] | ||
|width="415pt"|[[Image:hv-2000-ch15.jpg|thumb|none|400px|Gallery of pulses of channel 15.]] | |width="415pt"|[[Image:hv-2000-ch15.jpg|thumb|none|400px|Gallery of pulses of channel 15.]] | ||
| + | |width="415pt"|[[Image:hv-2000-amp-ch15.jpg|thumb|none|400px|Amplitude spectrum of ch 15 (counts versus amplitude in ADC channels, with shaper).]] | ||
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Revision as of 17:56, 30 April 2008
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:
So things start to show up (above threshold, the threshold was set just above noise) at 1700/1750 V and start to break down at 2000V.
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:
