Difference between revisions of "Minutes-4-7-2011"
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- Fernando: ASIC contract was awarded. Still waiting from the CDC people to confirm the parameters of the pre-amps and the FADC125 shaping. If needed one can modify the attenuation on their HV boards without changing the parameters of the pre-amps and fADC125. We already confirmed that the parameters are OK for the FDC. | - Fernando: ASIC contract was awarded. Still waiting from the CDC people to confirm the parameters of the pre-amps and the FADC125 shaping. If needed one can modify the attenuation on their HV boards without changing the parameters of the pre-amps and fADC125. We already confirmed that the parameters are OK for the FDC. | ||
| − | - Rigid-flex assemblies: we received 480 recently and expect the last 135 in May. Fernando and Chris wanted to know how to proceed with the stuffing: to tin or not to tin the contacts. Tinning is needed if the conductive tape doesn't work and we have to solder. So far testing electrically the conductive tape we haven't seen any differences between the tinned and not tinned samples. Still mechanical tests with tinned samples have not been done yet. For now, we decided to order 50 rigid-flexes tinned and 50 not tinned so that we can continue with the production. Depending on the results we will decide what to do with the rest | + | - Rigid-flex assemblies: we received 480 recently and expect the last 135 in May. Fernando and Chris wanted to know how to proceed with the stuffing: to tin or not to tin the contacts. Tinning is needed if the conductive tape doesn't work and we have to solder. So far testing electrically the conductive tape we haven't seen any differences between the tinned and not tinned samples. Still mechanical tests with tinned samples have not been done yet. For now, we decided to order 50 rigid-flexes tinned and 50 not tinned so that we can continue with the production. The price will be higher by a few hundred $ due to the set-up fees (Eugene agreed). Depending on the results we will decide what to do with the rest of the rigid-flexes. |
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| − | - | + | - Last week we received the first two sets of foils from the mass production that were already inspected. The foils look better that those from the first article; still visible are imprints of the rollers on the foils but these will disappear after tensioning. Another two sets just arrived. Roger asked to put the invoice number together with the results of the inspection in a spreadsheet so that he can handle the payments. |
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| + | == Engineering == | ||
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- Bill was working on some tooling: for sanding the outer 3mm of the Rohacell on the wire frames (ready), for the wire stringing sensors, and also on the new jig table that will be used for the package assembly. We decided that at the beginning, for the package assembly we will use the existing jig plate and the gusset from the prototype. | - Bill was working on some tooling: for sanding the outer 3mm of the Rohacell on the wire frames (ready), for the wire stringing sensors, and also on the new jig table that will be used for the package assembly. We decided that at the beginning, for the package assembly we will use the existing jig plate and the gusset from the prototype. | ||
Revision as of 17:34, 7 April 2011
April 7, 2011 FDC meeting
Agenda
- Production
- Readiness review: Final Report of the Review Committee
- Production status (Dave)
- Electronics
- Status (Fernando,Chris)
- Cathode foil inspection
- Engineering
- Tests with conductive tape (Lubomir, Bill)
- Status (Bill)
- Chamber testing
- Electronics calibration FDC Log Book, page 554-556 (Simon)
- Other
Minutes
Participants: Bill, Eugene, Dave, Chris, Roger, Fernando, Simon, and Lubomir.
Production
- Just before the meeting the review committee sent us their final report, linked above to the agenda. Eugene commented on it: there are no show-stoppers and the FDC production can continue. There are no recommendations, just findings and suggestions on which we may answer later. The main suggestion is to test the z-axis conductive tape technique for gluing the rigid-flex assemblies. They suggest to study the radiation damages and also to continue with the conventional testing in longer term. Even if it turns out later during the production that there are problems with this technique, it will be possible to re-solder the rigid-flexes using standard soldering technique. The committee also suggested to work on the packaging and storing of the materials and assemblies. There were some healthy concerns related to the air quality (due to the use of chemicals), HV as used for testing the chambers and also ergonomic conditions. Overall the conclusions of the committee are very positive and Eugene thanked to the people involved in the FDC review.
- Dave: the production actually started already on April 1st with making one cathode foil that will be used for the first chamber. The test cathode was glued to the frame but some additional tooling is needed to cut the foil. In the mean time we will tension the first production cathode foil. Also, the first production PCB ring was glued. Now we have the tools to trim the Rohacell on wire frames. For the start of the production we will use the solder wire from UVA, even it's thicker (~0.7mm) than what we have ordered.
Electronics
- Fernando: ASIC contract was awarded. Still waiting from the CDC people to confirm the parameters of the pre-amps and the FADC125 shaping. If needed one can modify the attenuation on their HV boards without changing the parameters of the pre-amps and fADC125. We already confirmed that the parameters are OK for the FDC.
- Rigid-flex assemblies: we received 480 recently and expect the last 135 in May. Fernando and Chris wanted to know how to proceed with the stuffing: to tin or not to tin the contacts. Tinning is needed if the conductive tape doesn't work and we have to solder. So far testing electrically the conductive tape we haven't seen any differences between the tinned and not tinned samples. Still mechanical tests with tinned samples have not been done yet. For now, we decided to order 50 rigid-flexes tinned and 50 not tinned so that we can continue with the production. The price will be higher by a few hundred $ due to the set-up fees (Eugene agreed). Depending on the results we will decide what to do with the rest of the rigid-flexes.
- Last week we received the first two sets of foils from the mass production that were already inspected. The foils look better that those from the first article; still visible are imprints of the rollers on the foils but these will disappear after tensioning. Another two sets just arrived. Roger asked to put the invoice number together with the results of the inspection in a spreadsheet so that he can handle the payments.
