Difference between revisions of "Minutes-10-7-2010"
| Line 47: | Line 47: | ||
- According to Vladimir Nelyubin from UVA, they demonstrated that the proposed tension measurement system works. They used a functional generator, audio amplifier, transformer | - According to Vladimir Nelyubin from UVA, they demonstrated that the proposed tension measurement system works. They used a functional generator, audio amplifier, transformer | ||
| − | to produce +/-400V pulses in an electrode. The electrode was 15cm copper tape placed along the wire at 5mm distance. The wires were connected to ground. To generate vibrations they had to apply in addition some constant | + | to produce +/-400V pulses in an electrode. The electrode was 15cm copper tape placed along the wire at 5mm distance. The wires were connected to ground. To generate vibrations they had to apply in addition some constant voltage ~1kV (it is not so clear why and has to be discussed further). The vibrations are visible and just visually one can identify |
| + | the resonance frequency of the order of 200Hz with ~2Hz precision. | ||
| + | |||
| + | - Lubomir re-visited the previous calculations ( | ||
== Full-scale prototype == | == Full-scale prototype == | ||
Revision as of 17:53, 7 October 2010
October 7, 2010 FDC meeting
Tentative Agenda
- Production
- Blue Crab status
- Frame production
- Electronics
- Update on PCBs, fADC125 and other (Fernando, Chris, Gerard)
- Engineering
- Wire stringing: fixtures, movement system (Bill, David)
- Update on tension measurements (Lubomir)
- Wire tension requirements (Lubomir)
- Other: gas system using methane
- Full-scale prototype
- testing fADC125 (Beni)
- plateau studies with 80/20 (Beni)
- resolutions with different gas mixtures and HV (Lubomir) [FDC Log Book, pages 522,523]
- argon/CO2/methane gas mixture properties (Lubomir) [FDC Log Book, pages 523,525]
- MC studies with different gas mixtures (Simion) [FDC Log Book, page 521]
- Other
Minutes
Participants: Eugene, Fernando, Chris, Simon, Beni, Glenn, Gerard (on the phone), and Lubomir. Bill, David, and Casey were busy at 126 laminating the first wire frame.
Production
- There was a meeting between JLab people and AdvanceTEC that will build the clean room. Completion date: January 7th. AdvanceTEC had two concerns: the power coming to building (from Dominion Power) is close to the expected use and has to be checked. The second is related to the quality of the floor, not good enough for 10K clean room. AdvanceTEC will send a quote to re-seal the floor.
- Bill, David and a machinist from our machine shop visited "Vision machining". The frame production has started. About half of the spacer rings are ready. Two of the wire frames are here at JLab, being laminated in the moment with the Rohacell rings in 126. Five Rohacell rings were made by Casey and David. Tomorrow morning David with techs will be at Blue Crab to turn up the two granite tables there. The idea is to start using some space at Blue Crab for the lamination because of the limited space in 126.
Electronics
- Gerard will use the pulses generated from Garfield to study the timing of the fADC125 and will try different interpolation algorithms. He's working now on the firmware.
- Chris: all 28x4 boards were shipped to the company for stuffing and will have 2x4 (two of each type) ready within a week.
- Fernando will finalize the rigid-flex design (Roger is busy the next several weeks) and then submit it to the procurement. In a week (Oct. 14) we must hear from the procurement about the cathode foils.
