Difference between revisions of "November 7, 2012 tracking CDC/FDC"
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##Gary made some a cooling ring with 32 holes in (at a 45 degree angle to the endplate) to blow air onto the electronics and fitted it to the chamber temporarily. | ##Gary made some a cooling ring with 32 holes in (at a 45 degree angle to the endplate) to blow air onto the electronics and fitted it to the chamber temporarily. | ||
##There was a fairly large discrepancy between the volume of air being blown into the chamber and the volume coming out through the bubblers. This is thought to be partly due to a gap in the sealing of the temporary downstream plenum. Whilst the chamber was being inspected for potential leaks, cracks were spotted in the neoprene U-channels forming part of the upstream plenum wall. These will be covered with DP-190 to seal the cracks. Then we will refit the temporary plenum (gasbag) and compare gas flow in and out. | ##There was a fairly large discrepancy between the volume of air being blown into the chamber and the volume coming out through the bubblers. This is thought to be partly due to a gap in the sealing of the temporary downstream plenum. Whilst the chamber was being inspected for potential leaks, cracks were spotted in the neoprene U-channels forming part of the upstream plenum wall. These will be covered with DP-190 to seal the cracks. Then we will refit the temporary plenum (gasbag) and compare gas flow in and out. | ||
− | ##Naomi mentioned that she'd measured the pedestal noise with and without the prototype attached to the HVB+preamp (with HV on, off and disconnected) and adding the prototype made very little difference (added 1.5 to a sigma of 15 | + | ##Naomi mentioned that she'd measured the pedestal noise with and without the prototype attached to the HVB+preamp (with HV on, off and disconnected) and adding the prototype made very little difference (added 1.5 to a sigma of 15 ADC bins, range 0-4095). |
Revision as of 12:43, 7 November 2012
Meeting Time and Place
Wednesday November 7, 2012 at 11:00am At Jefferson Lab, the meeting will be held in F326
Connections
To connect from the outside, please use ESNET
- ) ESNET: 8542553
- )To connect by telephone, dial:
- You can look up toll-free number at http://www.readytalk.com/intl
- US and Canada: (866)740-1260 (toll free)
- International: (303)248-0285 (toll call)
- enter access code followed by the # sign: 3421244#
Hardware Agenda
- Announcements
- FDC Update
- CDC Update
- Calibrations
Minutes
Participants: Curtis, Naomi, Beni, Simon, Lubomir, Mark
- FDC Update
- CDC Update
- Wiring the transition boards was completed last week.
- Gary made some a cooling ring with 32 holes in (at a 45 degree angle to the endplate) to blow air onto the electronics and fitted it to the chamber temporarily.
- There was a fairly large discrepancy between the volume of air being blown into the chamber and the volume coming out through the bubblers. This is thought to be partly due to a gap in the sealing of the temporary downstream plenum. Whilst the chamber was being inspected for potential leaks, cracks were spotted in the neoprene U-channels forming part of the upstream plenum wall. These will be covered with DP-190 to seal the cracks. Then we will refit the temporary plenum (gasbag) and compare gas flow in and out.
- Naomi mentioned that she'd measured the pedestal noise with and without the prototype attached to the HVB+preamp (with HV on, off and disconnected) and adding the prototype made very little difference (added 1.5 to a sigma of 15 ADC bins, range 0-4095).