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Test Results Of Chamber L2C0#3 [message #997] Thu, 30 September 2004 15:33 Go to previous 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

As an example, the results of testing chamber l2C0#3 are shown below (leakrate, gain curve, gain uniformity)

1.Leakrate
==========
The oxygen content within the chamber is measured in intervals of 5 minutes.
The asymptotic value is an indicator of the leakrate.
The flow rate was set at 10 l/h which leads to a time constant of ~4h
Fit : f(x)=a+b*exp(-c*x)

http://img48.exs.cx/img48/8567/leak_l2c0_3_glue.gif


http://img48.exs.cx/img48/6715/leak_l2c0_3_glue_log.gif



2.Gain Curve
============
The anode voltage is increased in steps of 20 V starting at 1000 V up to 1600 V.
At each step the anode current is recorded.
Fit : f(x)=a+b*exp(c*x)

http://img48.exs.cx/img48/3762/gaincurve_L2C0_3_glued_Sr.gif


http://img48.exs.cx/img48/2908/gaincurve_L2C0_3_glued_Sr_log.gif



3.Gain Uniformity
=================
There are two different measurement modes:


1. 1D scans with 4mm steps .Here you can clearly see the radiator bars, which absorb very strongly

1.1 4mm steps scan in z-direction at two different phi positions

http://img48.exs.cx/img48/4381/GainUni_L2C03_4mm_steps_horizontal_scan.gif

1.2 4mm steps scan in phi-direction at two different z positions

http://img48.exs.cx/img48/264/GainUni_L2C03_4mm_steps_vertical_scan.gif


2. A full 2D scan with 4cm equidistant steps. Here one can only see the radiator bar in the middle very clearly, due to the bigger step size.

http://img48.exs.cx/img48/4880/GainUni_L2C0_3_glued.gif

[Updated on: Tue, 01 February 2005 15:53]

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