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description: GSI Helmholtzzentrum für Schwerionenforschung
items: Absolute gain Measurement L1C1#2
items: Re: Absolute gain Measurement L1C1#2

Absolute gain Measurement L1C1#2
type: item
description: 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. edit: drift voltage : -2100 V gas mixture : Ar(85%)/CO2(15%)
creator: Sascha Freuen
date: 2005-01-10T13:23:55-00:00

Re: Absolute gain Measurement L1C1#2
type: item
description: 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
creator: Clemens Adler
date: 2005-01-12T08:58:23-00:00

Re: Absolute gain Measurement L1C1#2
type: item
description: 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
creator: Sascha Freuen
date: 2005-01-12T10:45:07-00:00

Re: Absolute gain Measurement L1C1#2
type: item
description: 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
creator: Clemens Adler
date: 2005-01-12T11:12:37-00:00