Difference between revisions of "Minutes-8-13-2015"

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# Engineering
 
# Engineering
 
# Other
 
# Other
 
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= Minutes =
 
= Minutes =
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== CDC update ==
 
== CDC update ==
  
- Simon studied the wire offset as function of z (along wire) using beam data. In the logbook entry linked above, the two plots show the offsets for a straw at 9 o'clock when the track is above/below the wire. The offset variations are consistent with up/down deformation, possibly sagging of the tube or wire. Curtis, Naomi: if supported at the ends only the tubes will sag by few mm, but after gluing them together there was no sagging.  
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- Simon studied the wire offset as function of z (along wire) using beam data. In the logbook entry linked above, the two plots show the offsets for a straw at 9 o'clock when the track is above/below the wire. The offset variations are consistent with up/down deformation, possibly sagging of the tube or wire. To confirm this, need to look also at straws at 12/6 o'clock. Curtis, Naomi: if supported at the ends only the tubes will sag by few mm, but after gluing them together there was no sagging.  
  
 
- Cosmic data will betaken over the weekend with mode 7.  
 
- Cosmic data will betaken over the weekend with mode 7.  
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== Electronics ==
 
== Electronics ==
  
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- Nich showed pictures (logbook entry linked above) demonstrating the CDC broken wire separation.
  
 
== FDC update ==
 
== FDC update ==
  
- Lubomir showed results with microscopic, MC type, Garfield simulations of the avalanche. Last two plots show distributions of the avalanche electrons - as function of distance to the wire (on average very close to the wire), and position along the wire (only ~6 micron spread). The asymmetry in the signals on the two cathodes can be predicted by the microscopic simulations at least qualitatively. The results depend on the exact electronics response function and the ion contribution. The asymmetry in the cathode signals comes from  the asymmetry in the weighting field at the two sides of the wire, demonstrated in the other plots above. 
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== Engineering ==
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- Finally we have about 50/50 gas mixture in both detectors - see the CO2 sensor results attached above. The measurements were done by switching between FDC (lower CO2) and CDC (higher CO2 percentage).
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Revision as of 15:24, 17 August 2015

August 13, 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. Detector performance document GlueX-doc-2775
  2. CDC update (Mike, Simon, Beni)
  3. FDC update (Luke,Lubomir)
  4. Electronics (Fernando, Chris, Nick)
  5. Engineering
  6. Other

Minutes

Participants: Curtis, Naomi, Mike (CMU), Luke, Beni, Dave, Chris, Nick, Simon, Sergey and Lubomir (JLab).

Detector performance document

- Curtis is working on a document describing the so-far achieved detector parameters compared with the design goals. Lubomir will add a page about the FDC.

CDC update

- Simon studied the wire offset as function of z (along wire) using beam data. In the logbook entry linked above, the two plots show the offsets for a straw at 9 o'clock when the track is above/below the wire. The offset variations are consistent with up/down deformation, possibly sagging of the tube or wire. To confirm this, need to look also at straws at 12/6 o'clock. Curtis, Naomi: if supported at the ends only the tubes will sag by few mm, but after gluing them together there was no sagging.

- Cosmic data will betaken over the weekend with mode 7.

Electronics

- Nich showed pictures (logbook entry linked above) demonstrating the CDC broken wire separation.

FDC update

-