Difference between revisions of "Minutes-7-8-2010"
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- According to Tim, the PR for the clean room is awaiting Claus Rode's signature. | - According to Tim, the PR for the clean room is awaiting Claus Rode's signature. | ||
| − | - Long discussion about the production procedures. Bill included in the Fast Track also the wire frame production, the wire stringing, and the testing of the chamber layers. The file is linked above (as jpeg) and is open for discussions and improvements. Bill asked Mark to look at the file (with Fast Track from Tom) and give his comments. 8 technicians will be involed full day and will produce one layer for 6 days, but realisticly we assume 8 days. For 30 layers it will be 240 working days. In addition, two scientists will assemble the stack and do HV and cosmics tests. The exact tests are not well defined, but the idea is to use all the time avalable for such tests, but not more than needed for the their production. Fernando asked about the cleaning of the wire frames after soldering and we discussed different options for ultrasonic cleaning. Fernando wanted to have a flow chart of the production with dates, so that he knows when the different components are needed for the production. One of the main unknown is when realistically we can move to the off-site space and start organizing the production. | + | - Long discussion about the production procedures. Bill included in the Fast Track also the wire frame production, the wire stringing, and the testing of the chamber layers. The file is linked above (as jpeg) and is open for discussions and improvements. Bill asked Mark to look at the file (with Fast Track from Tom) and give his comments. 8 technicians will be involed full day and will produce one layer for 6 days, but realisticly we assume 8 days. For 30 layers it will be 240 working days. In addition, two scientists will assemble the stack and do HV and cosmics tests. The exact tests are not well defined, but the idea is to use all the time avalable for such tests, but not more than needed for the their production. Fernando asked about the cleaning of the wire frames after soldering and we discussed different options for ultrasonic cleaning. Fernando wanted to have a flow chart of the production with dates, so that he knows when the different components are needed for the production. One of the main unknown is when realistically we can move to the off-site space and start organizing the production. The plan is to have the wire frames by 8/24 (first article) and 9/20 (all 30). According to Fernando we will have the PCBs by 7/19 (first article) and by 8/19 (all). The PR for the cathode foils will be submitted next week and the timing of their production is not known yet, but Roger has contacted the company: they can do the first article by the middle of August (assuming the procurement doesn't take a lot of time). Using this information, Lubomir will start working on the flow chart with dates on it. |
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| + | - Bill explained us his ideas about the wire stringing. He will use the strongback that is at IUCF. Lubomir will take care of bringing the strongback to JLab. The idea is to use tape pads to hold the wires at the right positions before gluing and soldering them. The wire positions will adjusted by hands (or with some tool) using the camera. We discuused once more different options for the tension measurements. | ||
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| + | - the templates for the | ||
- Bill started working on the wire stringing fixtures. We agree that this work has highest priority right now. Bill discussed the way the wires will be pushed down locally, close to the soldering pads. His idea is to use a diffraction plate with grooves: 50 grooves/mm with about 10 microns depth. The grooves will keep the wires at the same spacing while pushing them down. | - Bill started working on the wire stringing fixtures. We agree that this work has highest priority right now. Bill discussed the way the wires will be pushed down locally, close to the soldering pads. His idea is to use a diffraction plate with grooves: 50 grooves/mm with about 10 microns depth. The grooves will keep the wires at the same spacing while pushing them down. | ||
Revision as of 17:38, 8 July 2010
July 8, 2010 FDC meeting
Tentative Agenda
- Production
- 727 B.C. status
- wire frame production planning
- wire stringing design
- rohacell ring production
- Electronics: update (Fernando)
- Cathode redesign: finalizing (Roger)
- Full-scale prototype tests
- cosmic test results (Beni) FDC Log Book, pages 504
- oxygen contamination measurements Beni's scheme
- Other
