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Chamber testing manual [message #1022] Sun, 10 October 2004 15:46 Go to next message
Rainer Schicker is currently offline  Rainer Schicker
Messages: 9
Registered: August 2004
Location: Phys Inst Heidelberg
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From: *
A first draft of TRD chamber testing manual is available
Re: Chamber testing manual [message #1199 is a reply to message #1022] Mon, 29 November 2004 19:47 Go to previous message
Harald Appelshaeuser is currently offline  Harald Appelshaeuser
Messages: 39
Registered: March 2004
Location: GSI
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From: *
Dear Rainer,

the manual looks very good! I have a few questions and comments:

1.1 is the 90Sr source really needed for anything?

2. Chamber leakrate: the maximum allowed leak rate should be specified.

3. Chamber conditioning:
- I think the conditions need to be specified: flow rate, required O2 and H2O purity. Is the full drift voltage applied?
- O2 and H2O content should enter the database.
- can you specify when the conditioning was successful? what is the maximum allowed dark current, at what voltages?

4. Gain uniformity:
- which radiation source should be used (and why)? If X-ray tube: which settings are recommended?
- Conditions: flow rate, O2 and H2O? With or without drift voltage? Important: which anode voltage (sag!)?
- Which level of non-uniformity can be tolerated (standard deviation, maximum deviation)?

5. Gain curve:
- at which flow rate, O2, H2O? Which source? Which drift voltage?
- what is the recommended DeltaV and Vmax?
- should an absolute gain measurement be performed for every chamber (how much effort is this?)? Very important, but also in general: do we insist on a specific gas mixture?

Regards, Harry
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