Revision as of 18:20, 8 May 2014

May 1, 2014 FDC+CDC meeting

Agenda

Gas system status [1],[2] (Dave)
DAQ (Beni)
CDC testing (Mike)
Engineering Fluorinert level (Bill)
Electronics (Chris, Nick)
FDC alignment FDC E-log entry 144, [3], [4], [5],[6], [7](Lubomir)
Other

Instructions for Bluejeans meeting connection

FDC meeting ID: 290664653

@@ Line 18: / Line 18: @@
 = Minutes =
-Participants: Curtis, Naomi (CMU), Bill, Dave, Beni, Chris, Nick, Simon, Mike, and Lubomir (JLab).
+Participants: Curtis, Naomi (CMU), Mike, Dave, Chris, Nick, Eugene, Simon, Beni, and Lubomir (JLab).
 == Gas system ==
-- Pressure tests were done with industrial gas end of last week. The pure gas will come beginning of next week, then we can flush the whole system. However, we can start using the gas only after the ODH review is signed. ODH analyses show that, to have ODH-0 in the gas room, we need orifices of 0.052" on both Ar and CO2 input lines outside of the room.
+- The pure gas has arrived and we started purging the gas system in the gas room, including the two mixing tanks. Beni: There's a supply now to only one tank (we are still missing one MFC control panel) and the two tanks are connected at the output lines of the tanks. Beni is afraid that there will be an air pocket in the second tank and will take time to flush it. In any case we expect the control panel to arrive soon.
-- At the moment in the gas system we have only particle filters with 20 micron holes. Bill looked at possible gas filters for water, oxygen and hydrocarbons. The Matheson gas purifiers (first link) clean the gas down to 1ppm level. At CMU they used for the CDC less expensive filters (second link). Probably we need something in between and Bill is going to look into this.
+- The plan is to flush the gas system in the gas room over the weekend and at the beginning of the next week to include the lines in the hall bypassing the detectors. Later next week we will start flushing the detectors, as well.
-- Gas filtration in the other halls: In Hall A they have expensive filtration but their gas volume is lower. In Hall B (according to Steve Christo) they have water and oxygen filters. There is no gas filtration in Hall C according to Brad Sawatzky. Generally people think that the pure gas as supplied doesn't require additional filtering, however you need filters to save the detectors in case the gas in the bottles is contaminated by mistake. We decided we can start using the gas system as it is, but we will implement additional filtration as soon as possible.
+- Dave has a PLC software and GUI that can be used to open/close the valves needed for the flushing procedure. Mike is working on a GUI that uses epics variables for the gas system. Dave suspects a glitch in the MFC control panel software  that, however, he can be overcome for now.
 == DAQ ==
-- Beni: for the FDC trigger, vertical scintillator planes were installed at both ends of the magnet (picture attached). Beni brought NIM electronics to make the trigger as a coincidence between the two planes. Beni has compiled the DAQ code (both for the FDC and CDC) to be used with external trigger.
+- Beni: third VXS crate has been installed in the trigger rack to be used for triggering the FDC and CDC DAQ. Still needs from Sasha modules: TS, CPU and also wants to have a fast F1TDC to read the signals from the scintillators. The "horizontal" trigger gives about 80 counts per hour, but we don't know how many of these are really horizontal muons, most are expected to be coming from mini-showers above the scintillators.
+- Beni's plan is to make a common FDC+CDC trigger using the "horizontal" trigger plus the "vertical" trigger from the scintillators above and below the magnet, as used by BCAL. Nick will take care of the cable connections between the scintillator electronics and the trigger rack.
+- DAQ software:
 == CDC status ==

Difference between revisions of "Minutes-5-8-2014"

Revision as of 18:20, 8 May 2014

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