Difference between revisions of "Minutes-4-2-2015"

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Participants: Curtis, Naomi(CMU), Sean(NU), Eugene, Luke, Mike, Dave, Chris, Nick, Cody, Beni, Simon, and Lubomir (JLab).
 
Participants: Curtis, Naomi(CMU), Sean(NU), Eugene, Luke, Mike, Dave, Chris, Nick, Cody, Beni, Simon, and Lubomir (JLab).
  
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== Power outage issues ==
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== Running at half energy ==
  
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- After restoring the FDC LV, many channels showed "temperature failure". It turned out the fans of the LV crate (U2-2-BOT) were not blowing. After unplugging/plugging the power cord, the fans started operating. Fernando: most likely it is a control issue, also one has to find a way to read the fan speed remotely. The CDC LV crate had no problems.
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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 but only at one setting, 2200V but at a lower discriminator threshold, thus compensating for the smaller number of tracks.  
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- After the outage, the chiller was turned on without touching the switch-off box, even the interlock should have prevented the box from turning on. Dave and Hovanes will look into this.
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- All the elements of the gas system were of UPS and it never stopped for the FDC. Beni turned off the CDC MFCs in the gas room because they were in a continuous mode (temporary), therefore the pressure in the CDC mixing tank went to zero. It would be interesting to measrue the Oxygen contamination in the CDC.
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== Gas puzzle ==
 
== Gas puzzle ==
  
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- The new pump for the CO2 sensor will come tomorrow. After calibration the sensor will be installed in the Hall to monitor the adjustment of the CDC gas mixture to 50/50.
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- The new pump has been installed  
  
 
== CDC update ==
 
== CDC update ==

Revision as of 12:48, 3 April 2015

April 2, 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. Running at half energy
  2. Gas puzzle
    • CO2 monitoring [2]
  3. CDC update (Beni, Mike)
  4. FDC update (Lubomir)
  5. Electronics (Fernando, Cody, Chris, Nick)
  6. Engineering
  7. Other


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