Difference between revisions of "Minutes-6-23-2011"
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== Engineering == | == Engineering == | ||
| − | - Bill: we have most of the tooling needed for the wire deadening but have to know the radii of the dead areas. Lubomir: Originally it was decided to be able to register pions with 1GeV at 1deg which requires upper limits: 2.3cm 3.2cm 3.9 4.7cm (package#1-#4). Alex simulated the rates (doc linked above) and requiring to have at most 130kHz/strip gives lower limits: 2.9, 3.0, 3.0, 3.2cm. There's a conflict for the first package but it can be 2.9cm without affecting the accepance noticably resulting in: 2.9, 3.0, 3.9, 4.7cm. Finally, to be able to interchange modules we | + | - Bill: we have most of the tooling needed for the wire deadening but have to know the radii of the dead areas. Lubomir: Originally it was decided to be able to register pions with 1GeV at 1deg which requires upper limits: 2.3cm 3.2cm 3.9 4.7cm (package#1-#4). Alex simulated the rates (doc linked above) and requiring to have at most 130kHz/strip gives lower limits: 2.9, 3.0, 3.0, 3.2cm. There's a conflict for the first package but it can be 2.9cm without affecting the accepance noticably resulting in: 2.9, 3.0, 3.9, 4.7cm. Finally, to be able to interchange modules we decided to have 3.0cm, 3.0cm, 3.9cm, 3.9cm radii of the dead areas. |
| − | + | - FDC cabling scheme was discussed on a meeting this week and it was decided to build a mock-up. Bill gave us some details of the cable supports. We discussed the conduit material and if we need spare cables isntalled. Beni made a point that fixing a connector on the signal cables may require cutting the cable by 1ft to be in the flat part as it happend already. That's why we need spare signal cables installed. Eugene ragrding the number of the spare cables: we need to cover a sector for each package, say 4 or 8 per package; on the other hand we will have 42 conduits so it make sense to have 42 or 21 spare cables, something to be invetigated with the mock-up. As for the HV/LV cables there are ways to fix/split the cables and such spares installed are not needed. | |
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== Electronics == | == Electronics == | ||
Revision as of 18:20, 23 June 2011
June 23, 2011 FDC meeting
Agenda
- Production Construction Tracking (Dave)
- Second and third cell status
- Humidity requirements (related to possible changes of the AC settings)
- Other: using radioactive source at Blue Crab
- Engineering (Bill)
- Wire deadening Sasha's doc (page 13, Fig.14)
- Package cabling
- Other
- Electronics update (Fernando, Chris)
- Chamber testing at EEL126 (Beni, Lubomir)
- First cell status
- DAQ and software
- Other
Minutes
Participants: Eugene, Bill, Tim, Dave, Chris, Mark, Beni, Simon, Casey, and Lubomir.
Production
- Dave (see the Construction Tracking link above): cell#2 is ready, including one end window. Anatoly cleaned the wire frame manually. Second end window will be ready tomorrow. Will start very soon stacking the package, but need some parts. Cell#3: position measurements on the wire frame (Caleb and Al made a code that does it automatically, but has not been tested yet), making flaps on one of the cathodes and gluing rigid-flexes on the other one. Cell#4: wire frame is ready for stringing, one of the cathodes is being tensioned and the foil for the second is in preparation.
- We discussed if we can relax the clean room humidity requirements to save on the energy bill. The main concerns are the gluing operations and the Rohacell material being susceptible to elevated humidity. Tim explained: there's no humidity control and therefore it depends on the heat in the room (that's why it was elevated over the last weekend); we could increase the setting temperature from 69 to 70deg F to see the effect. Eugene: first we have to establish the production and then to investigate the effect of the humidity, even 50% is very high. Conclusion: at least for this month we don't want to change the settings.
- Bert Manzlak is trying to help us establishing a Radiation Control Area at Blue Crab and organized discussions with Keith Welch. RadCon are reluctant and are looking into the administrative papers if that is possible at all. According to Bert, a RCA was made off-site long time ago.
Engineering
- Bill: we have most of the tooling needed for the wire deadening but have to know the radii of the dead areas. Lubomir: Originally it was decided to be able to register pions with 1GeV at 1deg which requires upper limits: 2.3cm 3.2cm 3.9 4.7cm (package#1-#4). Alex simulated the rates (doc linked above) and requiring to have at most 130kHz/strip gives lower limits: 2.9, 3.0, 3.0, 3.2cm. There's a conflict for the first package but it can be 2.9cm without affecting the accepance noticably resulting in: 2.9, 3.0, 3.9, 4.7cm. Finally, to be able to interchange modules we decided to have 3.0cm, 3.0cm, 3.9cm, 3.9cm radii of the dead areas.
- FDC cabling scheme was discussed on a meeting this week and it was decided to build a mock-up. Bill gave us some details of the cable supports. We discussed the conduit material and if we need spare cables isntalled. Beni made a point that fixing a connector on the signal cables may require cutting the cable by 1ft to be in the flat part as it happend already. That's why we need spare signal cables installed. Eugene ragrding the number of the spare cables: we need to cover a sector for each package, say 4 or 8 per package; on the other hand we will have 42 conduits so it make sense to have 42 or 21 spare cables, something to be invetigated with the mock-up. As for the HV/LV cables there are ways to fix/split the cables and such spares installed are not needed.
Electronics
- Tinned or un-tinned flex connectors: all the samples so far, both tinned and un-tinned, show no problems except one channel on the first sample showing connection to ground when you bend it (later it turned out it is a problem of the connector on the daughter board). So, we decided to have them tinned because: (1) the conductive tape gluing works better with tinned, due to the increased thickness of the contacts, and (2) because we can use standard soldering technique, if we have to.
- Chris started receiving signal cables (first CDC type) 75 per week. He will test them at 126 and store them somewhere there.
Chamber testing
- We decided to move the first chamber to the test set-up in EEL126 on Monday. Bill will come on Monday to help with the installation of the holding brackets. Beni and Lubomir will try to find the best way to connect the chamber to the DAQ with the existing electronics in order to maximize the number of the readout channels.
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