Difference between revisions of "Minutes-9-17-2015"

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- Simon showed new plots on the CDC tube deformation (elog linked). In addition to the last meeting results, now he has plots for positive/negative delta(phi) and most interestingly their sum and difference.
 
- Simon showed new plots on the CDC tube deformation (elog linked). In addition to the last meeting results, now he has plots for positive/negative delta(phi) and most interestingly their sum and difference.
−
The sum looks very uniform indicating that the
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The sum looks very uniform indicating that the tube radius is OK. This is not the case for the difference, which means the wire is not in the center of the tube.
  
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== FDC update ==
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- Mike is working on the same studies but using cosmics. While Simon's beam result see the asymmetry in phi direction, the cosmic result would indicate asymmetry in horizontal direction. It is important to study also the z-dependence.
  
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- Lubomir showed cathode resolution results from the spring run with two different ST+FCAL triggers: run 3137 "standard" trigger and run 3200 excluding 4 additional layers of blocks in the center. The resolutions with the inner blocks excluded looks better and now very close to the one (~200 microns) in the fall run. This was achieved by using tighter cuts on the tracks used for the resolution studies; obviously the fact that we had half the energy in the spring explains this. Still, the offsets used for the fall and the spring runs are different and we don't understand why.
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== FDC update ==
  
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- Studies with 55Fe on the thick cell in the spare package: due to diffusion not all the charge is visible depending how far the photon interaction was from the wire. Expecting better results with 90/10 gas mixture where the drift times are much shorter.   
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- Cody and Sergey were able to run the new firmware with 1000-sample window. The two plots above demonstrate  
  
 
== Electronics ==
 
== Electronics ==

Revision as of 12:51, 24 September 2015

September 17, 2015 Drift Chamber meeting

Connection

  1. Instructions for Bluejeans meeting connection
  2. Meeting ID: 290664653
  3. To join via a Web Browser, go to the page [1] https://bluejeans.com/290664653.

Agenda

  1. Collaboration meeting agenda
  2. CDC update
  3. FDC update
    • studies with 90Sr and 55Fe on spare package: [2], [3]
  4. Electronics
  5. Engineering
    • MFC issues [4]
  6. Other


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