Difference between revisions of "Minutes-4-9-2015"

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= Minutes =
 
= Minutes =
  
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Participants: Curtis, Naomi(CMU), Sean(NU), Eugene, Luke, Mike, Dave, Chris, Nick, Cody, Beni, Simon, and Lubomir (JLab).
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Participants: Naomi(CMU), Sean(NU), Fernando, Luke, Mike, Dave, Chris, Nick, Cody, Beni, Simon, and Lubomir (JLab).
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== Running at half energy ==
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- For the FDC we expect to have about the same e.m. background on the chambers, i.e. we will be limited by the same photon intensity as in the fall run. The number of pion tracks is expected to be about half of that in the fall. We asked for 16 hours beam time assuming we will have 8 hours at each of the two HV settings: 2200V and 2250V. As the HV filter boxes are expected to reduce the noise significantly, we ask for 16h run only at one setting - 2200V but at a lower discriminator threshold - thus compensating for the smaller number of tracks.
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== Gas puzzle ==
 
== Gas puzzle ==
  
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- The new pump has been installed in the EEL and data taken with the spare package using the certified gas mixture. On the attached plot: CO2 measurements (blue), atmospheric pressure (black), corrected measurements (red) using (dp/p)^2.4 pressure correction. This pump has variable flow, Nick and Chris made voltage control for that. Thus the flow was adjusted in this way, keeping the rotameter open completely, so that the pump doesn't create vacuum.
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- The CO2 sensor was moved last Friday to the Hall connected to the CDC (figure attached above). Beni changed the CO2 gas factor from 0.74 to 1.  
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- The plan is to monitor the certified gas till Friday afternoon, then move the sensor to the Hall and monitor the CDC for one more day. On Saturday afternoon Beni will change the CO2 gas factor to 1.  
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== CDC update ==
 
== CDC update ==

Revision as of 17:31, 14 April 2015

April 9, 2015 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. Gas puzzle
    • CO2 monitoring [2]
  2. CDC update (Beni, Mike)
  3. FDC update (Lubomir)
    • Alignment status [3]
  4. Electronics (Fernando, Cody, Chris, Nick)
  5. Engineering
  6. Other


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