Difference between revisions of "Minutes-8-5-2010"
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== Production == | == Production == | ||
| − | - Bill: | + | - Bill: there will be a delay with the clean room construction, because some of the specifications (like +/-2% humidity control) were not realistic, which delays the bidding process. Eugene: the leading time is about 3 months, so expect it ready by December, although they will try to speed up the construction. |
| − | - Casey created a list of equipment and materials needed for the production. Everybody is encouraged to look at the link above. We discussed what type of microscope we need for the wire and flex soldering. Casey who is expected to be the main user wanted to have bigger working distance than the new Fernando's microscope. It will be nice also to have a fast camera to work in real time just looking at the screen. | + | - Casey created a list of equipment and materials needed for the production. Everybody is encouraged to look at the link above. We discussed what type of microscope we need for the wire and flex soldering. Casey who is expected to be the main user, wanted to have bigger working distance than the new Fernando's microscope. It will be nice also to have a fast camera to work in real time just looking at the screen. |
== Electronics == | == Electronics == | ||
| − | - Fernando reported on the acceptance test of the first article PCBs (see attached document). Overall the quality was good, the PDBs are accepted and the production should continue as scheduled. There were few exceptions, some of them minor, some easily fixable: on some of the boards the vias were not filled as required. One important issue was discussed: the material used in the boards is FR-4, but we required g10. | + | - Fernando reported on the acceptance test of the first article PCBs (see attached document). Overall the quality was good, the PDBs are accepted and the production should continue as scheduled. There were few exceptions, some of them minor, some easily fixable: on some of the boards the vias were not filled as required. One important issue was discussed: the material used in the boards is FR-4, but we required g10. We have to find out what's wrong with FR4 (water absorption, bromine content?) and see if we really need g10. Fernando will continue with electrical tests. After the meeting we went to F117 where Fernando showed the boards, their quality is certainly higher than of the boards used in the full-scale prototype. |
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| + | - One of the two cable companies was awarded, the price is 20% lower. | ||
== Engineering == | == Engineering == | ||
| − | - Cathode foils: | + | - 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: |
- Wire stringing: Bill had concerns about the precision of the position system at UVA (see pictures attached above). Vladimir explained how the system works and answered Bill's questions. They have measured the resolution to be 25 microns. Vladimir thinks it can be improved (as Bill suggested), but it is good enough for our purposes. Bill was concerned also about the space the system will occupy and that we have to move it around the table. Different options were discussed: moving the table, using two cameras. Bill: if he would start from scratch, he would build different system with better resolution. The plan is to get the system at JLab, check the resolution and then to decide what to do. Vladimir also explained how the tension measurement works: apply sine voltage on an electrode on the top of the chamber and pick up the signal from another electrode on the top of the wire to look for resonance. | - Wire stringing: Bill had concerns about the precision of the position system at UVA (see pictures attached above). Vladimir explained how the system works and answered Bill's questions. They have measured the resolution to be 25 microns. Vladimir thinks it can be improved (as Bill suggested), but it is good enough for our purposes. Bill was concerned also about the space the system will occupy and that we have to move it around the table. Different options were discussed: moving the table, using two cameras. Bill: if he would start from scratch, he would build different system with better resolution. The plan is to get the system at JLab, check the resolution and then to decide what to do. Vladimir also explained how the tension measurement works: apply sine voltage on an electrode on the top of the chamber and pick up the signal from another electrode on the top of the wire to look for resonance. | ||
Revision as of 19:06, 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
