Difference between revisions of "Minutes-1-17-2013"
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#* Fourth package tests [https://halldweb1.jlab.org/elog-halld/FDC FDC E-log Entry 101] | #* Fourth package tests [https://halldweb1.jlab.org/elog-halld/FDC FDC E-log Entry 101] | ||
# Other | # Other | ||
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= Minutes = | = Minutes = | ||
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== Production == | == Production == | ||
| − | - Dave: Last production package (#2) assembled! Redundant components: working on three more | + | - Dave: Last production package (#2) assembled! Redundant components: working on three more cathodes. Casey and Dave strung wire plane #31. Anatoly finished with the HV caps on #32, now also ready for stringing. |
| − | - | + | - Lubomir: package #2 being flushed with gas, but showing somewhat lower pressure, 0.39-0.44 inch H20, than we had for the other packages, 0.50-0.54, at the same conditions (input flow of 220sccpm, and same position of the rotameter (~95 units) that takes the gas to the O2 analyzer. No gas leakage was found. Changing the manifold to the one used in package #1 didn't affect the pressure. |
| − | - | + | - Redundant components: we decided to build six spare cells and build a full spare package. The package will not have pre-amp cards (need 132 and have about 20-30 spares) and therefore cooling tubes. We are not going to do the grounding, for that we prefer to have the cards in place to make sure we don't block the access to the connectors. Also we are not going to do the external HV wiring. Thus, if we need we can replace a package from the detector with the spare one, using the cards and HV connectors together with the wires from the original package. We decided to deaden the wires with the larger diameter (7.8cm) so that we can replace any package. We have 7 wire planes to choose from to build six cells. We have also enough cathode frames except that one has to be converted from type 2 to type 1, i.e. milling the O-ring groove. Dave: we will need also two spacer rings and short HV cables. Eugene asked Dave to estimate the material and extra labor (about 5 manweeks) needed to build two additional cells. |
| + | |||
| + | == Basis of Estimate for the FDC == | ||
| + | |||
| + | <!-- | ||
- Bases of Estimate for the FDC activities: we need to come with such estimations for the FDC activities as summarized in the spreadsheet attached; guidelines also attached above. Eugene: the idea is to understand what is the source of the estimations (both procurements and labor) for each activity and assign contingency accordingly. However, we should try to do the best estimates as of now (not at the time the last schedule was prepared) which may result in different numbers than what's in the schedule? This should be done for all the activities that are not finished yet as of now, not by the time on the next review (March/April). Lubomir and Dave will do the estimations for the cell production and package final assembly and testing. Lubomir will talk to Bill on Monday about the fiducial, cooling stuff and package assembly. Dave will make an estimate for the consumables needed till August. In addition it turned out we have to do that same for the FDC installation activities, which can be done with the Tim's/Tom's help. | - Bases of Estimate for the FDC activities: we need to come with such estimations for the FDC activities as summarized in the spreadsheet attached; guidelines also attached above. Eugene: the idea is to understand what is the source of the estimations (both procurements and labor) for each activity and assign contingency accordingly. However, we should try to do the best estimates as of now (not at the time the last schedule was prepared) which may result in different numbers than what's in the schedule? This should be done for all the activities that are not finished yet as of now, not by the time on the next review (March/April). Lubomir and Dave will do the estimations for the cell production and package final assembly and testing. Lubomir will talk to Bill on Monday about the fiducial, cooling stuff and package assembly. Dave will make an estimate for the consumables needed till August. In addition it turned out we have to do that same for the FDC installation activities, which can be done with the Tim's/Tom's help. | ||
Revision as of 12:59, 18 January 2013
January 17, 2013 FDC meeting
Agenda
- Production Construction Tracking (Dave)
- Production status
- Plans for spare parts [1]
- Basis of Estimate for the FDC activities ,guideline (Lubomir, Bill, Dave)
- Engineering (Bill)
- Electronics (Chris, Nick)
- Tests at EEL126 FDC E-log (Beni)
- Fourth package tests FDC E-log Entry 101
- Other
Minutes
Participants: Eugene, Glenn, Dave, Bill, Simon, and Lubomir.
Production
- Dave: Last production package (#2) assembled! Redundant components: working on three more cathodes. Casey and Dave strung wire plane #31. Anatoly finished with the HV caps on #32, now also ready for stringing.
- Lubomir: package #2 being flushed with gas, but showing somewhat lower pressure, 0.39-0.44 inch H20, than we had for the other packages, 0.50-0.54, at the same conditions (input flow of 220sccpm, and same position of the rotameter (~95 units) that takes the gas to the O2 analyzer. No gas leakage was found. Changing the manifold to the one used in package #1 didn't affect the pressure.
- Redundant components: we decided to build six spare cells and build a full spare package. The package will not have pre-amp cards (need 132 and have about 20-30 spares) and therefore cooling tubes. We are not going to do the grounding, for that we prefer to have the cards in place to make sure we don't block the access to the connectors. Also we are not going to do the external HV wiring. Thus, if we need we can replace a package from the detector with the spare one, using the cards and HV connectors together with the wires from the original package. We decided to deaden the wires with the larger diameter (7.8cm) so that we can replace any package. We have 7 wire planes to choose from to build six cells. We have also enough cathode frames except that one has to be converted from type 2 to type 1, i.e. milling the O-ring groove. Dave: we will need also two spacer rings and short HV cables. Eugene asked Dave to estimate the material and extra labor (about 5 manweeks) needed to build two additional cells.
