Minutes-4-24-2014
April 24, 2014 FDC meeting
Agenda
- Gas system [1],[2] (Dave, Beni)
- CDC status (Beni, Mike)
- DAQ [3], [4] (Beni)
- Electronics (Chris, Nick)
- Experimental Safety Assessment Document HallD_ESAD (Lubomir, Beni)
- FDC cathode scan [5] (Bill, Lubomir)
- Other
Instructions for Bluejeans meeting connection
FDC meeting ID: 290664653
Minutes
Participants: Curtis, Niomi (CMU), Eugene, Bill, Dave, Beni, Chris, Nick, Simon, and Lubomir (JLab).
Gas system
- Dave: The pressure tests of the gas system started, we found one bad flow controller that Bill is going to send back for repair. Scott connected the CDC and the FDC mixing vessels so that, without one flow controller, we still can supply gas, the same mixture, for both detectors. The fact that CDC and FDC are going to use slightly different gas mixtures is not important in the moment (Curtis).
- It turned out that we have industrial gas (both Ar and CO2) ordered and used now for the tests of the gas system. An option would be to put filters and continue using it till we get the right gas. Eugene: we should stop using it right away, or when we are done with the pressure tests. Dave prepared documents (attached above) for the flushing of the gas system and the detectors, but it should wait till we get the right gas.
CDC status
- Mike: the CDC cooling has been installed but the temperature oscillates (Nick) by about 5-6degC. Bill thinks there are easy ways to fix this. Before the cooling system was installed, Nick measured the temperature on the regulators and it was ~60degC which (according to Fernando) means about 100degC on the silicon. This is not acceptable and the LV should not be kept for more than 1 hour without cooling.
DAQ
- Cody is modifying the fADC125 firmware to make the beginning and the width of the time window parameters. The numbering of the fADC channels now starts from 0. Beni wants to make sure all this works before he starts testing the CDC.
- Now every detector has its own account to be used with the DAQ. So far Beni was running the DAQ on his own account.
- Beni was reading the FDC strips for more than a week. The results are linked above: two plots for the up- and down-stream cathodes in each a column represents one package. Since there's no trigger even 1Hz noise (similar to the cosmics rate) is visible. Therefore we should try using a trigger, the easiest for now will be to use the scintillator paddles below the magnet (Eugene).
Electronics
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ESAD
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