Time-of-Flight/Start-Counter/Target Meeting, December 11, 2009
Location, Time
Friday, December 11, 2009
2:00 pm EDT
JLab: CEBAF Center, Room F326/7
ESNet: 8542553
EVO: direct meeting link
Conference Group: 800-377-8846, participant code: 77438230
Slides: talks can be deposited in the directory /group/halld/www/halldweb1/html/talks/2009-12 on the JLab CUE (you have to be a member of the "halld" group). This directory is accessible from the web at https://halldweb1.jlab.org/talks/2009-12/ .
Agenda
- Minutes from the last meeting
- Time-of-Flight Status: Sasha O.?
- Start Counter Status: Werner?
- Target Status: Aram?
- Action Items
Minutes
JLab: Mark Ito (chair), Chris Keith, Sascha Somov, Simon Taylor, Tim Whitlatch, Beni Zihlmann
tof
leading edge, with fernando, online ben working on 16 channel discriminator for hall b, will build 5 for us as well richard, plans to use le, fixed array and microscope, because of high rate
pulse tube refrigerator, mechanical, no cold moving parts so no vibration maintenance is easier, 20k hours of operation, maintenance cycle helium gas and room temp compressor, 4 K pulse tube, at 20 K tens of watts of cooling, two stages 50 or 60 watts to cool radiation shield 2nd stage cold stage: liq hydrogen. 4.5 k 1.5 watts requires cooling water for compressor 220 V 3-phase for power hydrogen completely closed system target group will do everything will need design authority controls: plc path Chris no help vme-based epics 10 thermometers 5 pressure gauges heater Steve Cristo will probably consult several liters of hydrogen Cryomech is a good candidate
timescale: start think no earlier than next fall frozen spin and q weak coming up 18 months to build
finish by July 2012
spare compressor might be good idea $25k
tim: mechanical support a la Hall B, should not be too much of an issue
talk to rory how did you find out about this meeting
3 phys 2 engineers 3 technician
