Difference between revisions of "Minutes-1-8-2015"

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= Minutes =
 
= Minutes =
  
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Participants: Naomi (CMU), Beni (Switzerland), Mike, Dave, Curtis, Chris, Simon, Vlad, and Lubomir (JLab).
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Participants: Naomi (CMU), Eugene, Mike, Dave, Fernando, Chris, Nick, Simon, Beni, Vlad, Sergey, and Lubomir (JLab).
  
 
== CDC update ==
 
== CDC update ==
  
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- Mike: trying to explain the factor of 4 higher gains (both with cosmics and with beam) now as compared to the tests at CMU. Mike found that the CO2 gas factor is now 0.77 instead of the recommended 0.74 but this could not explain the above factor of 4. HV change (Naomi) is also very unlikely since you need at least 150V for that. Most likely the factor of 4 is coming from the electronics/analysis and Naomi is now setting up the DAQ with the prototype straws to figure this out. Beni: when the CDC was in the EEL126 it was tested only with a scope by Anatoly, but not with the DAQ. Chris will try to figure out which pre-amps have been used at CMU.
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- Beni showed a plot, charge integral vs drift time, and slices of it, integral distribution for different drift times (plots attached). For smaller drift times you see the pedestal and the peak well separated and the amplitudes going down exponentially. For big drift times one starts seeing a second bump (not clear why!), while the first peak gets closer to the pedestal (because the track length inside the straw gets shorter)
  
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- Naomi discussed some plots (linked above) showing that the signals from 24 channels (one connector) are coming earlier than the rest by about 30-40ns, as seen from the fADC125 data. NO idea what's the reason for that. 
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- Mike was working on a tool to view the signals from the fADC125 modules in a single crate using the built-in pulser. Mike is also working on the CDC efficiency, it's >90% if require the track to be at <1mm to the wire.  
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- According to Beni, for the Holiday break we can lower the CDC flow to about 0.8l/min (from 1.3l/min now). For the FDC we can go down to 80ccpm per package (from 100ccpm).
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== FDC update ==
 
== FDC update ==

Revision as of 19:46, 8 January 2015

December 18, 2014 FDC+CDC meeting

Connection

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

Agenda

  1. CDC update (Mike)
Energy vs Time Ring10
Energy vs Time Ring10 projection1
Energy vs Time Ring10 projection2
Energy vs Time Ring10 projection3
Energy vs Time Ring10 projection4
Energy vs Time Ring10 projection5


  1. FDC update gas difference, gain calibration(Lubomir, Vlad)
  2. Other:electronics, engineering


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