Difference between revisions of "June 22, 2011 Tracking CDC/FDC"
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== CDC Update == | == CDC Update == | ||
| − | #The techs are part way through installing layer 22, the second layer of the last group of stereo tubes. | + | # The techs are part way through installing layer 22, the second layer of the last group of stereo tubes. |
| − | #They measured the tension of the | + | # Six axial layers have been strung: 1,2,3,4, 13 and 14. |
| + | # They have measured the tension of all the wires in rows 1,2,3 and 4 (192 out of the 438 strung so far). All except one wire was within specifications. The one which was out of specification will be replaced during the next stringing session, but it has now been removed from the chamber. Interestingly, this wire had passed the continuity measurement, but failed the tension measurement. It appears that either the crimp did not hold, or the crimp snapped the wire inside the crimp pin. When the wire was pulled, it was in one piece, and none was visible in the lower crimp pin. | ||
| + | |||
#We had one day where the particulate count in the clean room soared to 57,000/cu.ft, this was associated with the extreme swampy weather conditions outdoors where the outdoor count was over 500,000/cu.ft; after installing a dehumidifier and then an a/c unit the particulate count returned to below 2000 and the room became much more pleasant to work in. | #We had one day where the particulate count in the clean room soared to 57,000/cu.ft, this was associated with the extreme swampy weather conditions outdoors where the outdoor count was over 500,000/cu.ft; after installing a dehumidifier and then an a/c unit the particulate count returned to below 2000 and the room became much more pleasant to work in. | ||
#The HVB prototype that Fernando sent is fine. [http://www.jlab.org/Hall-D/software/wiki/index.php/Pre-production_prototype_HVB CDC prototype HVB] | #The HVB prototype that Fernando sent is fine. [http://www.jlab.org/Hall-D/software/wiki/index.php/Pre-production_prototype_HVB CDC prototype HVB] | ||
#Naomi has been pursuing resolution measurements with Gerard's LE algorithm, varying the gas mix used in the Garfield time:distance lookup tables used for interpolation, so far 48/52 seems to be the best fit for mixed "50/50" Ar/CO2. | #Naomi has been pursuing resolution measurements with Gerard's LE algorithm, varying the gas mix used in the Garfield time:distance lookup tables used for interpolation, so far 48/52 seems to be the best fit for mixed "50/50" Ar/CO2. | ||
Revision as of 13:41, 22 June 2011
Meeting Time and Place
Wednesday June 22, 2011 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#
Agenda
- Announcements
- FDC Update logbook
- CDC Update
Minutes
Participants: Curtis, Naomi, Beni, Simon, Lubomir, Dave
FDC Update
CDC Update
- The techs are part way through installing layer 22, the second layer of the last group of stereo tubes.
- Six axial layers have been strung: 1,2,3,4, 13 and 14.
- They have measured the tension of all the wires in rows 1,2,3 and 4 (192 out of the 438 strung so far). All except one wire was within specifications. The one which was out of specification will be replaced during the next stringing session, but it has now been removed from the chamber. Interestingly, this wire had passed the continuity measurement, but failed the tension measurement. It appears that either the crimp did not hold, or the crimp snapped the wire inside the crimp pin. When the wire was pulled, it was in one piece, and none was visible in the lower crimp pin.
- We had one day where the particulate count in the clean room soared to 57,000/cu.ft, this was associated with the extreme swampy weather conditions outdoors where the outdoor count was over 500,000/cu.ft; after installing a dehumidifier and then an a/c unit the particulate count returned to below 2000 and the room became much more pleasant to work in.
- The HVB prototype that Fernando sent is fine. CDC prototype HVB
- Naomi has been pursuing resolution measurements with Gerard's LE algorithm, varying the gas mix used in the Garfield time:distance lookup tables used for interpolation, so far 48/52 seems to be the best fit for mixed "50/50" Ar/CO2.
