Difference between revisions of "Minutes-6-19-2014"
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FDC meeting ID: 290664653 | FDC meeting ID: 290664653 | ||
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- Leak test of the gas system has been performed by closing the mass flow controllers to the detectors first, then closing all the inputs and outputs of the two mixing tanks (pressure graph linked above). It showed a drop of ~1psi in four hours for the CDC tank and much less for the FDC tank. The sniffer showed a leakage on the CDC relief valve of ~10^-3 (from 10^-5 in air) and ~10^-4 on the FDC relief valve. Scott ordered relief valves with better quality from Circle Valve Technology Inc. | - Leak test of the gas system has been performed by closing the mass flow controllers to the detectors first, then closing all the inputs and outputs of the two mixing tanks (pressure graph linked above). It showed a drop of ~1psi in four hours for the CDC tank and much less for the FDC tank. The sniffer showed a leakage on the CDC relief valve of ~10^-3 (from 10^-5 in air) and ~10^-4 on the FDC relief valve. Scott ordered relief valves with better quality from Circle Valve Technology Inc. | ||
| − | - We used this test to check the leaks in the FDC. The pressures in each cell of the four packages are linked above. The first | + | - We used this test to check the leaks in the FDC. The pressures in each cell of the four packages are linked above. The first three packages showed no measurable leak in 6 hours. For this time, the pressure in the fourth package decreased from 60 Pa to 36Pa in all the six cells. The leak is not significant and most likely it is outside of the detector (same for all the cells). We will check it once we have an access from the downstream side of the magnet. |
== DAQ == | == DAQ == | ||
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- Beni got the DAQ working! Bryan Moffit helped him. It is working now with 4 CDC and one FDC crate. In the FDC crate in addition to the "slow" F1TDCs, Beni has also one fast F1TDC for the trigger scintillators. | - Beni got the DAQ working! Bryan Moffit helped him. It is working now with 4 CDC and one FDC crate. In the FDC crate in addition to the "slow" F1TDCs, Beni has also one fast F1TDC for the trigger scintillators. | ||
Revision as of 17:25, 19 June 2014
June 19, 2014 FDC+CDC meeting
Agenda
- Gas system leakage test, [1], [2], [3], [4]
- DAQ (Beni)
- CDC status (Mike)
- Electronics (Chris, Nick)
- Readiness review (Beni, Lubomir)
- Engineering (Bill)
- cathode measurements
- Other
Instructions for Bluejeans meeting connection
FDC meeting ID: 290664653
Minutes
Participants: Curtis, Naomi (CMU), Dave, Eugene, Chris, Nick, Simon, Fernando, and Lubomir (JLab).
Electronics
- Nick: three CDC HV modules replaced with the ones recently repaired and they are working fine. In the moment we have 2 spare 1550P modules and another 2 are being repaired in Italy. In addition, Fernando ordered two extra 1550Ps that will be delivered by September.
- Two thermocouples have been installed on the CDC: one on the cooling duct and the other on the detector. Thus, one can check if the cooling is working. After some measurements it will be possible to interlock the CDC LV supply in case the cooling fails.
Gas system
- Leak test of the gas system has been performed by closing the mass flow controllers to the detectors first, then closing all the inputs and outputs of the two mixing tanks (pressure graph linked above). It showed a drop of ~1psi in four hours for the CDC tank and much less for the FDC tank. The sniffer showed a leakage on the CDC relief valve of ~10^-3 (from 10^-5 in air) and ~10^-4 on the FDC relief valve. Scott ordered relief valves with better quality from Circle Valve Technology Inc.
- We used this test to check the leaks in the FDC. The pressures in each cell of the four packages are linked above. The first three packages showed no measurable leak in 6 hours. For this time, the pressure in the fourth package decreased from 60 Pa to 36Pa in all the six cells. The leak is not significant and most likely it is outside of the detector (same for all the cells). We will check it once we have an access from the downstream side of the magnet.
