Difference between revisions of "Minutes-4-18-2013"
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== Production == | == Production == | ||
| − | - Dave for the spare package: Just one wire frame remains to be deadened. We will start the installation of the first two spare cells next week. The plan is to install the last two cells with thicker spacer rings (just temporary to test the cluster counting technique). Therefore we need longer treaded rods, later they will be replaced with standard ones. As for the metal pins we can leave with the standard (short) ones, it will affect only the top cathode that can be centered with pins from the top. Eventually, we want to use He/ Isobutane | + | - Dave for the spare package: Just one wire frame remains to be deadened. We will start the installation of the first two spare cells next week. The plan is to install the last two cells with thicker spacer rings (just temporary to test the cluster counting technique). Therefore we need longer treaded rods, later they will be replaced with standard ones. As for the metal pins we can leave with the standard (short) ones, it will affect only the top cathode that can be centered with pins from the top. Eventually, we want to use He/Isobutane pre-mixed gas for the tests only with the top two cells and then we have to deal with number of issues: safety (flammability), permeability through mylar (Kapton is much better) and we may have to cover the end windows by an additional Kapton foil, but this will come later. |
| − | - Package #3 status: | + | - Package #3 status: Cell #6 was tested successfully: all channels working and kept HV for 4 days without trips. All subsystems were restored: grounding, HV connections. Today we finished replacing the the cooling loops; now the splittings are as in the other other packages. What remains to be done is the installation of the cooling manifolds and then the package can be moved to EEL126 for testing with the full electronics. |
== Installation == | == Installation == | ||
| − | - | + | - We started collecting the information in a document (linked above) describing the FDC installation. We discussed what are the minimum requirement for the electronics to start the installation and testing of the FDC while it's outside of the magnet. First we discussed if it's possible to lay the cables in a proper way without connecting them to the electronics. Since at least the cable guides will be installed on the racks this is in principle possible, but then inserting the crates (full of modules) in between the cables will be tricky. At the end, for the testing we will need the modules. This procedure is much more feasible if the crates are already installed in the racks and we are adding modules as we go with the tests. In the moment according to the plan, the modules will be tested in the crate and then the crate together with the modules will be installed in the racks, but Fernando says it's possible first to install the crates only. Therefore, the most likely scenario (in case of delays with the electronics) will be to have the crates installed in the racks in advance. When we start cabling we will use the same set of modules for all the packages moving them from crate to crate. For the tests we will have to install scintillators at the top and bottom of the installation cart for cosmics trigger. Given the delay with the fADC125 Fernando thinks it's not likely to be able to make self-triggering from the fADCs, so we should relay only on external trigger. |
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== Engineering == | == Engineering == | ||
Revision as of 16:23, 18 April 2013
April 18, 2013 FDC meeting
Agenda
- Production Construction Tracking (Dave)
- Third package status
- Installation (Lubomir, Bill)
- FDC installation document
- Practicing at Blue Crab
- Engineering (Bill)
- Cooling system tests
- Electronics (Chris, Nick)
- Full electronics tests FDC E-log
- Other
