Difference between revisions of "Minutes-8-5-2010"
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== Engineering == | == Engineering == | ||
− | - Cathode foils: the PR submitted, waiting for signatures. Roger discussed with Allflex people the grounding of the flexes that is done by vias which can be very costly. Different ideas were exchange: to make the flex longer on the sides and fold it, to use double-sided flexes and connect the two sides with conductive glue at the periphery of the flexes. Roger got also important information from Allflex: | + | - Cathode foils: the PR submitted, waiting for signatures. Roger discussed with Allflex people the grounding of the flexes that is done by vias which can be very costly. Different ideas were exchange: to make the flex longer on the sides and fold it, to use double-sided flexes and connect the two sides with conductive glue at the periphery of the flexes. Roger got also important information from Allflex: conductive film that conducts in one direction only (3M company) can be used instead of the cathode soldering. Has to be heated to 400 deg F, but Bill says this should be OK. Bill will ask for samples and we will start playing as soon as we have the first article cathode foils. |
− | - | + | - The mylar windows of the FDC packages (2 per package) have to be thicker, as Bill requested. We agreed that their thickness can be increased from 1/2 mil to 1 or 2mil which is a small change compared to the target thickness. |
− | - | + | - Wire stringing: the strongbacks from UVA have arrived. Bill also will order the pieces needed to attach the pin-rails to the granite table. |
== Full-scale prototype test == | == Full-scale prototype test == | ||
− | - | + | - Beni connected the new oxygen sensor. The instructions how to read it in case of different gases are posted at the FDC logbook page 511. Indeed, the measurements confirmed that we have oxygen contamination of the order of 0.1% that explains the mean charge vs drift time dependence. |
− | - | + | - Now we have estimation for the wire resolution, using two chamber layers with parallel wires and external tracking with the IU chambers. Beni showed several plots from the FDC logbook explaining the procedure. The mean resolution is about 200 microns and varies with the distance to the wire. There's a systematic deviation from the expected by the external tracking angle, that can be corrected for, but has to be understood. |
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== Other == | == Other == | ||
− | + | Lubomir will have a talk at a conference (CAARI2010) next week, the contributed paper is linked above; comments and remarks are welcomed. Whether there will be a FDC meeting next week will be decided later next week.--> | |
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Revision as of 19:30, 5 August 2010
August 5, 2010 FDC meeting
Tentative Agenda
- Production
- 727 B.C. status
- equipment/materials needed for the production Casey's list
- Electronics: update (Fernando) doc1567
- Engineering
- Cathode foil: flex soldering/gluing, procurement status (Roger) [3M conductive film]
- Mylar window thickness
- Wire stringing update (Bill)
- Full-scale prototype tests [FDC Log Book, pages 509-512]
- oxygen contamination measurements (Beni)
- cosmic test update (Beni)
- wire resolution results
- Other