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Absolute gain Measurement L1C1#2 [message #1279] Mon, 10 January 2005 14:23 Go to next message
Sascha Freuen is currently offline  Sascha Freuen
Messages: 9
Registered: August 2004
Location: Heidelberg PI
occasional visitor
From: *kip.uni-heidelberg.de
Dear All

Please find below the results of our absolute gain measurement.
The measurement was achieved by recording the anode current and the individual pulses.
For measuring we used the Fe source with 3 different collimators.
This is to avoid space charge effects and to check for consistency.
Collimator 3 allows the most intensity , collimator 1 least intensity.



http://img25.exs.cx/img25/6669/absgainlog4iv.gif

edit:
drift voltage : -2100 V
gas mixture : Ar(85%)/CO2(15%)

[Updated on: Wed, 12 January 2005 17:55]

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Re: Absolute gain Measurement L1C1#2 [message #1297 is a reply to message #1279] Wed, 12 January 2005 09:58 Go to previous messageGo to next message
Clemens Adler is currently offline  Clemens Adler
Messages: 42
Registered: March 2004
continuous participant
From: *physi.uni-heidelberg.de
Hi Sascha,
I have one question to your measurement, since the gain is only 2/3 of what is reported in Anton et al.'s 'Drift velocity and Gain...'-paper. Was the drift voltage on for your measurements?

cheers,
Clemens
Re: Absolute gain Measurement L1C1#2 [message #1298 is a reply to message #1297] Wed, 12 January 2005 11:45 Go to previous messageGo to next message
Sascha Freuen is currently offline  Sascha Freuen
Messages: 9
Registered: August 2004
Location: Heidelberg PI
occasional visitor
From: *kip.uni-heidelberg.de
Hi Clemens

The drift voltage was -2100 V.

btw. oxygen content was 80 ppm ,which maybe reduce the abs. gain too, due to electron attachment ?

cheers
Sascha
Re: Absolute gain Measurement L1C1#2 [message #1299 is a reply to message #1298] Wed, 12 January 2005 12:12 Go to previous message
Clemens Adler is currently offline  Clemens Adler
Messages: 42
Registered: March 2004
continuous participant
From: *physi.uni-heidelberg.de
Hi Sascha,
Christian just reminded me that the chambers in the paper have a different geometry (6.4mm amplification region instead of 7.2mm for the big chambers). This easily explains the difference.

cheers
Clemens

[Updated on: Wed, 06 April 2005 14:41]

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