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

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== Gas system ==
 
== Gas system ==
  
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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. Narciso is looking for better valves.  
  
 
- On Tuesday ~6pm there was again a failure of the FDC gas control box in the gas room. As a result the pressure in the mixing tank started dropping below 7 psi. We had to call the guard to open the room and reset the box. A new spare box has been ordered. For the future Beni suggests to have a key from the gas room in the counting house.   
 
- On Tuesday ~6pm there was again a failure of the FDC gas control box in the gas room. As a result the pressure in the mixing tank started dropping below 7 psi. We had to call the guard to open the room and reset the box. A new spare box has been ordered. For the future Beni suggests to have a key from the gas room in the counting house.   

Revision as of 16:43, 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. Narciso is looking for better valves.

- On Tuesday ~6pm there was again a failure of the FDC gas control box in the gas room. As a result the pressure in the mixing tank started dropping below 7 psi. We had to call the guard to open the room and reset the box. A new spare box has been ordered. For the future Beni suggests to have a key from the gas room in the counting house.

- 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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