Difference between revisions of "March 30, 2011 Tracking CDC/FDC"
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==CDC Update== | ==CDC Update== | ||
| − | # Status of the Construction | + | # Status of the Construction: The construction team are part-way through installation of row 18. The last box of 220 straws has been started and will be used up in a few weeks time. We have not heard any news of the resistance of the material from Sheldahl. When we know the likely length of the time-gap in the straw supply we will decide whether to start stringing straight tubes or work on the HVB connector wires. |
| − | The construction team are part-way through installation of row 18. The last box of 220 straws has been started and will be used up in a few weeks time. We have not heard any news of the resistance of the material from Sheldahl. When we know the likely length of the time-gap in the straw supply we will decide whether to start stringing straight tubes or work on the HVB connector wires. | + | # Status of the hook-up wires: The hook-up wires (meaning the assembly with the conductive rubber on one end of the wire and the ferrule and exposed hooked central conductor at the other) which were made with the original sample length of wire were tested for gas-tightness, and after sealing the end of the wire with epoxy, they did not leak. More hook-up wires were made with the new reel of wire and these did leak. They were tested for gas-tightness using Slava's small swiss-cheese prototype chamber filled with ethane, and a flammable gas detector. More wires were made using different grades of epoxy and tested for gas-tightness, and a potting compound was found which did seal the wires so that they passed the leak test. |
| − | + | # Coax terminator for PCB End: Trial runs at soldering the HVB end of the hook-up wires proved to be rather tricky and also messy. Some commercially available terminators were found which would make this task much easier and neater. [http://www.tycoelectronics.com/catalog/products/en?q=B-046-16-N Terminator details] The terminators end with one wire loop, when this is snipped it leaves 2 ends which can be pushed through holes in the PCB and soldered in place. This could permit the size of the PCB to be reduced, or the existing size could be used and the wires glued to the PCB for added strength. The terminators are $4.83 each. [http://search.digikey.com/scripts/DkSearch/dksus.dll?vendor=0&keywords=920107-000-nd Terminator order details] Curtis asked if JLab would be able to negotiate a better price. | |
| − | # Status of the hook-up wires | + | # Summer students: We have 2 students lined up for summer work. |
| − | The hook-up wires (meaning the assembly with the conductive rubber on one end of the wire and the ferrule and exposed hooked central conductor at the other) which were made with the original sample length of wire were tested for gas-tightness, and after sealing the end of the wire with epoxy, they did not leak. More hook-up wires were made with the new reel of wire and these did leak. They were tested for gas-tightness using Slava's small swiss-cheese prototype chamber filled with ethane, and a flammable gas detector. More wires were made using different grades of epoxy and tested for gas-tightness, and a potting compound was found which did seal the wires so that they passed the leak test. | + | # New fADC: Naomi is collecting cosmic data at 2030V with 50/50 mixed Ar/CO2. The gain with the new fADC does look slightly higher than that of the old Struck fADC + shaper so she picked 2030V as a compromise between putting the cosmics max amplitude near ch 200 whilst keeping the efficiency high. Histograms will be coming later. |
| − | + | ||
| − | # Coax terminator for | + | |
| − | Trial runs at soldering the HVB end of the hook-up wires proved to be rather tricky and also messy. Some commercially available terminators were found which would make this task much easier and neater. The terminators end with one wire loop, when this is snipped it leaves 2 ends which can be pushed through holes in the PCB and soldered in place. | + | |
| − | + | ||
| − | This could permit the size of the PCB to be reduced, or the existing size could be used and the wires glued to the PCB for added strength. | + | |
| − | The terminators are $4.83 each. | + | |
| − | [http://search.digikey.com/scripts/DkSearch/dksus.dll?vendor=0&keywords=920107-000-nd Terminator order details] | + | |
| − | Curtis asked if JLab would be able to negotiate a better price. | + | |
| − | + | ||
| − | # Summer students | + | |
| − | We have 2 students lined up for summer work. | + | |
| − | + | ||
| − | # New fADC | + | |
| − | Naomi is collecting cosmic data at 2030V with 50/50 mixed Ar/CO2. The gain with the new fADC does look slightly higher than that of the old Struck fADC + shaper so she picked 2030V as a compromise between putting the cosmics max amplitude near ch 200 whilst keeping the efficiency high. Histograms will be coming later. | + | |
| − | + | ||
# CDC Monthly progress report | # CDC Monthly progress report | ||
Beni reminded us that this is due on Monday. | Beni reminded us that this is due on Monday. | ||
Revision as of 14:44, 30 March 2011
Meeting Time and Place
Wednesday March 30, 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
- CDC Update
- Status of the Construction.
- Status of the hook-up wires.
- Coax terminator for PCB End Terminator Terminator
Minutes
Participants: Curtis, Naomi, Mark, Eugene, Beni, Simon, Lubomir, Elton, Dave
FDC Update
CDC Update
- Status of the Construction: The construction team are part-way through installation of row 18. The last box of 220 straws has been started and will be used up in a few weeks time. We have not heard any news of the resistance of the material from Sheldahl. When we know the likely length of the time-gap in the straw supply we will decide whether to start stringing straight tubes or work on the HVB connector wires.
- Status of the hook-up wires: The hook-up wires (meaning the assembly with the conductive rubber on one end of the wire and the ferrule and exposed hooked central conductor at the other) which were made with the original sample length of wire were tested for gas-tightness, and after sealing the end of the wire with epoxy, they did not leak. More hook-up wires were made with the new reel of wire and these did leak. They were tested for gas-tightness using Slava's small swiss-cheese prototype chamber filled with ethane, and a flammable gas detector. More wires were made using different grades of epoxy and tested for gas-tightness, and a potting compound was found which did seal the wires so that they passed the leak test.
- Coax terminator for PCB End: Trial runs at soldering the HVB end of the hook-up wires proved to be rather tricky and also messy. Some commercially available terminators were found which would make this task much easier and neater. Terminator details The terminators end with one wire loop, when this is snipped it leaves 2 ends which can be pushed through holes in the PCB and soldered in place. This could permit the size of the PCB to be reduced, or the existing size could be used and the wires glued to the PCB for added strength. The terminators are $4.83 each. Terminator order details Curtis asked if JLab would be able to negotiate a better price.
- Summer students: We have 2 students lined up for summer work.
- New fADC: Naomi is collecting cosmic data at 2030V with 50/50 mixed Ar/CO2. The gain with the new fADC does look slightly higher than that of the old Struck fADC + shaper so she picked 2030V as a compromise between putting the cosmics max amplitude near ch 200 whilst keeping the efficiency high. Histograms will be coming later.
- CDC Monthly progress report
Beni reminded us that this is due on Monday.
