Difference between revisions of "Minutes-1-5-2012"
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# [http://www.jlab.org/Hall-D/detector/fdc/tdr/tdr.pdf TDR] (Simon) | # [http://www.jlab.org/Hall-D/detector/fdc/tdr/tdr.pdf TDR] (Simon) | ||
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- Cu tubing: by directly measuring the weight of a tube piece we found the tube is heavier then what was used in the simulations. Later it turned out that the tubing was simulated correctly, according to the specifications for the tube sizes: 4mm OD and 2.79mm ID. For 4mm OD and Cu density of 8.96 g/cm^3 from the weight measurements one gets 2.14mm ID. After the meeting direct ID measurements confirmed the specified 2.79mm. The only explanation so far is that the density of the tube material is higher. | - Cu tubing: by directly measuring the weight of a tube piece we found the tube is heavier then what was used in the simulations. Later it turned out that the tubing was simulated correctly, according to the specifications for the tube sizes: 4mm OD and 2.79mm ID. For 4mm OD and Cu density of 8.96 g/cm^3 from the weight measurements one gets 2.14mm ID. After the meeting direct ID measurements confirmed the specified 2.79mm. The only explanation so far is that the density of the tube material is higher. | ||
| + | |||
| + | - We discussed if we need additional hubs and pins to assemble the last two packages, or we can re-use some of those from the already assembled packages. We need the hubs for the tests in 126 (to attach the strongback). | ||
== Electronics == | == Electronics == | ||
| − | - Chris | + | - Chris: made 4 more pre-amp sets (22 each) for the remaining cells in the first package. Will do one more set to be installed on the second package for testing purposes. All the pre-amps will be tested by Cody and likely will have them next week. |
| + | |||
| + | <!-- | ||
- LV cables: Anodes: spacing must be 2.75" (instead of 5") between the two connectors. Vladimir tested all the cathode groups with a mock-up cable. In two groups the 10-5-10" cable didn't work, but one was able to re-group the cards in such a way that 10-5-10" is long enough to be used everywhere. Prototype helped to understand that in most of the groups you have excessive length and only for a few you need the full length. Eugene insisted that we need to work more in optimizing the LV cabling by increasing the number of cable types so that we don;'t have excessive cables inside the detector. Bill and Vladimir will work on that. | - LV cables: Anodes: spacing must be 2.75" (instead of 5") between the two connectors. Vladimir tested all the cathode groups with a mock-up cable. In two groups the 10-5-10" cable didn't work, but one was able to re-group the cards in such a way that 10-5-10" is long enough to be used everywhere. Prototype helped to understand that in most of the groups you have excessive length and only for a few you need the full length. Eugene insisted that we need to work more in optimizing the LV cabling by increasing the number of cable types so that we don;'t have excessive cables inside the detector. Bill and Vladimir will work on that. | ||
Revision as of 18:44, 5 January 2012
January 5, 2012 FDC meeting
Agenda
- Production Construction Tracking (Dave)
- Production update
- Second package tests (Lubomir)
- Engineering update (Bill)
- Cooling system
- Electronics update (Chris)
- Pre-amp cards
- HV cabling
- Grounding (Lubomir)
- LV cabling Vlad's scheme
- TDR (Simon)
- Other
Minutes
Participants: Bill, Dave, Chris, Mark, Simon, Beni (ESNET), Eugene, and Lubomir.
Production
- Dave for the last cell of the second package: a field wire was replaced on the wire plane yesterday to be cleaned today, daughter cards were glued on the type-2 cathode today, type-1 cathode is ready. Tomorrow we will have all the parts of the last cell ready for testing and installation. Next cell (for third package): wire frame was laminated, type-1 cathode ready, working on the flaps for the type-2 cathode. For the nex wire frame lamination we will use a board with the vias not sealed (we have several of this kind); Bill suggested using Hysol to cover the vias right after lamination.
- The fifth cell of the second package was installed right before the break and was tested this week successfully. It took long time (~10 days) to condition the chamber: Epon didn't dry as usual or gas flow was too low during the break?
Engineering
- Bill showed pictures for different parts of the cooling system: pump, manifold. The pump is supposed to operate at ~100psi. The coolant (Fluorinert) is heavier (1.73g/cm^3) than watter.
- Cu tubing: by directly measuring the weight of a tube piece we found the tube is heavier then what was used in the simulations. Later it turned out that the tubing was simulated correctly, according to the specifications for the tube sizes: 4mm OD and 2.79mm ID. For 4mm OD and Cu density of 8.96 g/cm^3 from the weight measurements one gets 2.14mm ID. After the meeting direct ID measurements confirmed the specified 2.79mm. The only explanation so far is that the density of the tube material is higher.
- We discussed if we need additional hubs and pins to assemble the last two packages, or we can re-use some of those from the already assembled packages. We need the hubs for the tests in 126 (to attach the strongback).
Electronics
- Chris: made 4 more pre-amp sets (22 each) for the remaining cells in the first package. Will do one more set to be installed on the second package for testing purposes. All the pre-amps will be tested by Cody and likely will have them next week.
