Difference between revisions of "Minutes-6-5-2014"
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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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| + | - 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 re-start 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. | - 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. | + | - 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 == | == DAQ and CDC status == | ||
Revision as of 16:39, 5 June 2014
June 5, 2014 FDC+CDC meeting
Agenda
- Gas system [1], [2], [3], [4], [5], Mike's gas GUI
- DAQ (Beni)
- CDC status (Mike)
- Engineering (Bill)
- cathode measurements [6]
- Electronics (Chris, Nick)
- Instructions for shift workers (Beni, Lubomir)
- FDC alignment [7] (Lubomir)
- FDC pedestal resolution: media:pedestal_resolution.pdf
- 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.
- 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 re-start 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.
![[1]](http://www.jlab.org/Hall-D/detector/fdc/gas_system/Tank_p_2014-06-02at1.19.01PM.png){kind=link}
![[2]](http://www.jlab.org/Hall-D/detector/fdc/gas_system/Tank_p_2014-06-02at4.36.31PM.png){kind=link}
![[3]](http://www.jlab.org/Hall-D/detector/fdc/gas_system/Tank_p_2014-06-02at4.38.23PM.png){kind=link}
![[4]](http://www.jlab.org/Hall-D/detector/fdc/gas_system/Tank_p_2014-06-03at9.00.41AM.png){kind=link}
![[5]](http://www.jlab.org/Hall-D/detector/fdc/gas_system/Tank_p_2014-06-04at11.09.50AM.png){kind=link}
![[6]](http://www.jlab.org/Hall-D/detector/fdc/calibration/CScan_microscop1.JPG){kind=link}