Difference between revisions of "Minutes-7-14-2011"
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# Other: [http://www.jlab.org/Hall-D/detector/fdc/tracking/FDC_NamingConvention.pdf naming convention] | # Other: [http://www.jlab.org/Hall-D/detector/fdc/tracking/FDC_NamingConvention.pdf naming convention] | ||
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= Minutes = | = Minutes = | ||
| − | Participants: | + | Participants: Bill, Dave, Chris, Elton, Beni, Simon, Glenn, Caleb, and Lubomir. |
== Production == | == Production == | ||
| − | - Dave | + | - Dave (see the construction tracking): Cell#3 is almost ready, just second phase elements has to be put on the wire frame. The cathodes on cell#4 are ready except the flaps on the type-2 cathode. Now the techs are working on the cathodes for cell#5. We are using now the two tensioning tools. We decided to postpone the wire frame production till we make a decision how to solve the HV problem, discussed later. |
| − | - | + | - Wire deadening: waiting for the chemicals needed. We will use the square lexan plate for tooling, but Bill will order another plate to be used for this procedure. Bill talking to Brian learned that the chemicals have to be neutralized at the end of the proocedure and that was not always done before when experimenting on a testing wire frame. We will try the deadening first on several testing frames before using a production one. Dave with Al's help is finishing the micro-controller and also working on a way to bypass the 1M resistors on each wire channel. |
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| − | Bill | + | |
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| − | on | + | |
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== Engineering == | == Engineering == | ||
| − | - | + | - Bill ordered the strong-back for the packages. One option would be to attach it to the package after it is assembled, and the other is just to assmble the package on the top of the strong-back in which case we need several of them. We want to have flatness on the chambers better than 200 microns, but Bill says with the material we have it is hardly possible. |
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- Bill explained the current design of the connections between the packages. | - Bill explained the current design of the connections between the packages. | ||
Revision as of 17:20, 14 July 2011
July 14, 2011 FDC meeting
Contents
Agenda
- Production Construction Tracking (Dave)
- Status
- Wire deadening
- Engineering (Bill)
- Flatness problem: package strongback, gusset rings
- Stringing table modifications
- Electronics (Chris)
- HV tests
- Other
- Chamber testing at EEL126
- First cell tests with fADC: cathode resolution(Lubomir)
- Tests with external tracking (Beni)
- Other: naming convention
Minutes
Participants: Bill, Dave, Chris, Elton, Beni, Simon, Glenn, Caleb, and Lubomir.
Production
- Dave (see the construction tracking): Cell#3 is almost ready, just second phase elements has to be put on the wire frame. The cathodes on cell#4 are ready except the flaps on the type-2 cathode. Now the techs are working on the cathodes for cell#5. We are using now the two tensioning tools. We decided to postpone the wire frame production till we make a decision how to solve the HV problem, discussed later.
- Wire deadening: waiting for the chemicals needed. We will use the square lexan plate for tooling, but Bill will order another plate to be used for this procedure. Bill talking to Brian learned that the chemicals have to be neutralized at the end of the proocedure and that was not always done before when experimenting on a testing wire frame. We will try the deadening first on several testing frames before using a production one. Dave with Al's help is finishing the micro-controller and also working on a way to bypass the 1M resistors on each wire channel.
Engineering
- Bill ordered the strong-back for the packages. One option would be to attach it to the package after it is assembled, and the other is just to assmble the package on the top of the strong-back in which case we need several of them. We want to have flatness on the chambers better than 200 microns, but Bill says with the material we have it is hardly possible.
- Bill explained the current design of the connections between the packages. We exchanged different ideas how to use this construction to correct for the out-of-plane deviations of the packages.
- One of the gusset rings is ready and we can start re-assembling the second cell. A survey of the strong-back for the wire frame showed sagging of ~2mm. Bill says it is easy to correct it and it will do it after we are done with the third wire frame. We discussed also what do we need to start the wire deadening.
Electronics
- Chris: 80 FDC type-1 cables were tested, found one bad. Another 130 FDC cables came, not tested yet. - Eugene: all the ASICS will be ready by the end of the month, but making the pre-amp cards will take many months.
Chamber testing
- As before, we can use one out of four HV sectors. After having understood the effects of the frame deformation, we are now studying the chamber resolution. So far it's not as good as on prototype, especially on the top strips. However, by swapping the cards at the detector it turned out that the effect goes with the card. So, the problem could be in the cards, cables, fADC, or the analysis code.
Other
- Eugene asked Dave how we are the production schedule. Dave: we are late by about a month but expect the be on track for the first package.
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