Difference between revisions of "Minutes-6-14-2012"
| Line 22: | Line 22: | ||
- The problem with the noise on cell #4 was solved: a tiny piece of epoxy (or something like that) got stuck to the sense wire in that area. Casey cleaned it but that was not easy. The package was closed on Friday and this week was tested: the noise disappeared. | - The problem with the noise on cell #4 was solved: a tiny piece of epoxy (or something like that) got stuck to the sense wire in that area. Casey cleaned it but that was not easy. The package was closed on Friday and this week was tested: the noise disappeared. | ||
| − | - Wire frame #1 can't be used at > 1900/-500V and at this voltage the current is very high (~1uA). Before the meeting Eugene agreed to purchase another 4 spare sets of PCBs. | + | - Wire frame #1 can't be used at > 1900/-500V and at this voltage the current is very high (~1uA). Before the meeting Eugene agreed to purchase another 4 spare sets of PCBs. A.s.a.p. before purchasing we want to test wire plane #2. It has a conductive spot from the chemical used for deadening, shortening a field and sense wire. We will test also the other two spare wire planes, but they seam to be fine. Then we will know how many new wire planes we need to build. We have only one extra G10 wire frame and in case we need more we have to order them, as well. |
== Engineering update == | == Engineering update == | ||
| − | - Caleb: Bill is busy, but he explained | + | - Caleb: Bill is busy, but he explained well details of the outer (outside of the FDC) part of the cooling system that will have Fluorinert and water loops. Caleb will work with Bill also on the testing of the cooling system. |
== Electronics update == | == Electronics update == | ||
| − | - Chris: LV cables have come | + | - Chris: LV cables have come. We discussed that it is worth setting up the LV system in 126 and later connecting the LV cables to the third package (when it will be in 126) but not applying voltage on most of them since we will need cooling. |
| + | |||
| + | === Cable assignment == | ||
| + | |||
| + | - See the document above prepared by Vlad. It contains (in Excel format) a table of all the signal cables showing the label and the destination rack, crate, module, and connector. There's a scheme at the end of the document | ||
== Gas system == | == Gas system == | ||
| − | - Beni is in contact with Narciso | + | - Beni is in contact with Narciso; soon we will have separate meeting about the gas system. |
== Test set-up at 126 == | == Test set-up at 126 == | ||
| − | - | + | - Beni: CODA-Light doesn't work with Linux ROCs so far. Will talk to Bryan Moffit if something can be done, if not possible we will have to move to the "heavy" CODA. |
| + | - Vlad tested the cathodes of the top three cells of the first package in 126 with a source. The main complain is that on some of the channels there are no signals, but after unscrewing the card from the cooling tube it starts working. It is not clear why: probably the tube pulls/bends the card or the cathode frame. There were suggestions to tighten the tubes to the package evenly around the periphery with cables ties using the holes on the cathodes. Will be discussed with Bill. | ||
| + | |||
== Other == | == Other == | ||
Revision as of 18:40, 14 June 2012
June 14, 2012 FDC meeting
Contents
Agenda
- Production Construction Tracking (Dave)
- Production status
- Spare wire frames (Lubomir)
- Engineering update (Bill)
- Electronics update (Chris)
- Cable assignment and labeling (Vlad)
- Gas system (Beni)
- Test set-up in 126 (Beni)
- Other FDC E-log
Minutes
Participants: Caleb, Dave, Chris, Nick, Vlad, Simon, Beni, and Lubomir.
Production
- Dave: on last wire frame (#18) had to replace one sense wire and twice one field wire due to incorrect tension, now it's out of the string table and Chris will put the components tomorrow. Two wire frames will be deadened tomorrow, and #18 will be deadened on Monday. Cathode #55, the last for package #4, is ready too. On Tuesday/Wednesday we will continue with the stacking of the fourth package. Working on spare cathodes #54, 57, and 59.
- The problem with the noise on cell #4 was solved: a tiny piece of epoxy (or something like that) got stuck to the sense wire in that area. Casey cleaned it but that was not easy. The package was closed on Friday and this week was tested: the noise disappeared.
- Wire frame #1 can't be used at > 1900/-500V and at this voltage the current is very high (~1uA). Before the meeting Eugene agreed to purchase another 4 spare sets of PCBs. A.s.a.p. before purchasing we want to test wire plane #2. It has a conductive spot from the chemical used for deadening, shortening a field and sense wire. We will test also the other two spare wire planes, but they seam to be fine. Then we will know how many new wire planes we need to build. We have only one extra G10 wire frame and in case we need more we have to order them, as well.
Engineering update
- Caleb: Bill is busy, but he explained well details of the outer (outside of the FDC) part of the cooling system that will have Fluorinert and water loops. Caleb will work with Bill also on the testing of the cooling system.
Electronics update
- Chris: LV cables have come. We discussed that it is worth setting up the LV system in 126 and later connecting the LV cables to the third package (when it will be in 126) but not applying voltage on most of them since we will need cooling.
= Cable assignment
- See the document above prepared by Vlad. It contains (in Excel format) a table of all the signal cables showing the label and the destination rack, crate, module, and connector. There's a scheme at the end of the document
Gas system
- Beni is in contact with Narciso; soon we will have separate meeting about the gas system.
Test set-up at 126
- Beni: CODA-Light doesn't work with Linux ROCs so far. Will talk to Bryan Moffit if something can be done, if not possible we will have to move to the "heavy" CODA.
- Vlad tested the cathodes of the top three cells of the first package in 126 with a source. The main complain is that on some of the channels there are no signals, but after unscrewing the card from the cooling tube it starts working. It is not clear why: probably the tube pulls/bends the card or the cathode frame. There were suggestions to tighten the tubes to the package evenly around the periphery with cables ties using the holes on the cathodes. Will be discussed with Bill.
