Difference between revisions of "Minutes-6-5-2014"

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FDC meeting ID: 290664653
 
FDC meeting ID: 290664653
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= Minutes =
 
= Minutes =
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- There were several problems in the FDC parts of the gas system. A series of graphs (from Mike) linked above demonstrate some of them. A 1 l/min leak was found due to bad fitting of one of the valves and later fixed: first graph shows the pressure in the mixing tank (red is FDC) with ~2 l/min filling flow and 0.4l/m FDC usage. To identify the place we were excluding different parts of the system. Once the tank was insulated (flat part in second graph) there was still some pressure drop; it turned out there's a small leak from the relief valve on top of the FDC mixing tank. Same valve is used on the CDC tank but it has not been checked.
 
- There were several problems in the FDC parts of the gas system. A series of graphs (from Mike) linked above demonstrate some of them. A 1 l/min leak was found due to bad fitting of one of the valves and later fixed: first graph shows the pressure in the mixing tank (red is FDC) with ~2 l/min filling flow and 0.4l/m FDC usage. To identify the place we were excluding different parts of the system. Once the tank was insulated (flat part in second graph) there was still some pressure drop; it turned out there's a small leak from the relief valve on top of the FDC mixing tank. Same valve is used on the CDC tank but it has not been checked.
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- Pressures in the six cells of package 1 are shown in third and fourth graph, when the flow was turned off and then on. It shows very small (~1Pa) variations probably due to temperature and very similar values in the different cells.
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- Mike has his first version of the gas GUI ready (linked above) and checked in the svn: https://halldsvn.jlab.org/repos/trunk/controls/css. Any remarks and recommendations are welcome and should be directed to Mike.
 
   
 
   
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== CDC status ==
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== DAQ and CDC status ==  
  
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- Mike: still can't have all the HV channels working: the problems is in the CAEN modules. Will use one 1535P module instead of 1550P but that is not enough. Mike will do another CDC leakage test. The temperatures at the pre-amps are oscillating by 1-1.5 deg; still using the same cooling.    
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- No news here. DAQ is in the Sasha's hands now.
  
 
== Electronics ==
 
== Electronics ==
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- Fernando: will discuss the HV issues with the CAEN people and request additional checks. Two HV modules are being repaired now, three were repaired before, all having problems with setting/holding HV. In addition we have many channels showing dark current of 0.5-1 uA without anything connected to the module. Eugene wanted to know how many spare modules we will need.   
 
- Fernando: will discuss the HV issues with the CAEN people and request additional checks. Two HV modules are being repaired now, three were repaired before, all having problems with setting/holding HV. In addition we have many channels showing dark current of 0.5-1 uA without anything connected to the module. Eugene wanted to know how many spare modules we will need.   

Revision as of 16:32, 5 June 2014

June 5, 2014 FDC+CDC meeting

Agenda

  1. Gas system [1], [2], [3], [4], [5], Mike's gas GUI
  2. DAQ (Beni)
  3. CDC status (Mike)
  4. Engineering (Bill)
    • cathode measurements [6]
  5. Electronics (Chris, Nick)
  6. Instructions for shift workers (Beni, Lubomir)
  7. FDC alignment [7] (Lubomir)
  8. FDC pedestal resolution: media:pedestal_resolution.pdf
  9. Other

Instructions for Bluejeans meeting connection

FDC meeting ID: 290664653

Minutes

Participants: Curtis (CMU), Bill, Beni, Chris, Nick, Simon, Fernando, and Lubomir (JLab).

Gas system

- There were several problems in the FDC parts of the gas system. A series of graphs (from Mike) linked above demonstrate some of them. A 1 l/min leak was found due to bad fitting of one of the valves and later fixed: first graph shows the pressure in the mixing tank (red is FDC) with ~2 l/min filling flow and 0.4l/m FDC usage. To identify the place we were excluding different parts of the system. Once the tank was insulated (flat part in second graph) there was still some pressure drop; it turned out there's a small leak from the relief valve on top of the FDC mixing tank. Same valve is used on the CDC tank but it has not been checked.

- Pressures in the six cells of package 1 are shown in third and fourth graph, when the flow was turned off and then on. It shows very small (~1Pa) variations probably due to temperature and very similar values in the different cells.

- Mike has his first version of the gas GUI ready (linked above) and checked in the svn: https://halldsvn.jlab.org/repos/trunk/controls/css. Any remarks and recommendations are welcome and should be directed to Mike.

DAQ and CDC status

- No news here. DAQ is in the Sasha's hands now.

Electronics

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