Minutes-5-1-2014

May 1, 2014 FDC+CDC meeting

Agenda

1. Gas system status [1],[2]
   • ODH analysis
   • Gas purifiers (Bill), Filters used at CMU
2. DAQ trigger scintillators (Beni)
3. CDC testing (Mike)
4. Engineering (Bill)
   • FDC/CDC survey
5. Electronics (Chris, Nick)
6. Experimental Safety Assessment Document HallD_ESAD (Lubomir, Beni)
7. Other

Instructions for Bluejeans meeting connection

FDC meeting ID: 290664653

Minutes

Participants: Curtis, Naomi (CMU), Bill, Dave, Beni, Chris, Nick, Simon, Mike, 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.

- 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.

- 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.