Difference between revisions of "ASIC design optimizations"

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m (→‎Planned tests)
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[[Image:hvplateau_ch15.jpg|thumb|none|400px|HV-curve,the count is normalized to 100s measurements.]]
 
[[Image:hvplateau_ch15.jpg|thumb|none|400px|HV-curve,the count is normalized to 100s measurements.]]
  
−
Below galleries of pulses are shown for different HV:
+
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:
 
** 1600 V
 
** 1600 V
 +
{| border="1" cellpadding="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.]]
 +
|-
 +
|}
 +
 +
** 1650 V
 +
{| border="1" cellpadding="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.]]
 +
|-
 +
|}
 +
 +
** 1700 V
 +
{| border="1" cellpadding="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.]]
 +
|-
 +
|}
 +
 +
** 1750 V
 +
{| border="1" cellpadding="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.]]
 +
|-
 +
|}
 +
 +
** 1800 V
 +
{| border="1" cellpadding="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.]]
 +
|-
 +
|}
 +
 +
** 1850 V
 +
{| border="1" cellpadding="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.]]
 +
|-
 +
|}
 +
 +
** 1900 V
 +
{| border="1" cellpadding="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.]]
 +
|-
 +
|}
 +
 +
** 1950 V
 +
{| border="1" cellpadding="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.]]
 +
|-
 +
|}
 +
 +
** 2000 V
 +
{| border="1" cellpadding="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.]]
 +
|-
 +
|}
 +
  
  

Revision as of 15:59, 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:

HV-curve,the count is normalized to 100s measurements.

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:

    • 1600 V
Gallery of pulses of channel 2.
Gallery of pulses of channel 15.
    • 1650 V
Gallery of pulses of channel 2.
Gallery of pulses of channel 15.
    • 1700 V
Gallery of pulses of channel 2.
Gallery of pulses of channel 15.
    • 1750 V
Gallery of pulses of channel 2.
Gallery of pulses of channel 15.
    • 1800 V
Gallery of pulses of channel 2.
Gallery of pulses of channel 15.
    • 1850 V
Gallery of pulses of channel 2.
Gallery of pulses of channel 15.
    • 1900 V
Gallery of pulses of channel 2.
Gallery of pulses of channel 15.
    • 1950 V
Gallery of pulses of channel 2.
Gallery of pulses of channel 15.
    • 2000 V
Gallery of pulses of channel 2.
Gallery of pulses of channel 15.



  • (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:

Gallery of pulses measured after the pre-amplifier
Gallery of pulses measured after the pre-amplifier
Gallery of pulses measured after the pre-amplifier
Gallery of pulses measured after the pre-amplifier
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