Difference between revisions of "Minutes-4-14-2011"
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== Electronics == | == Electronics == | ||
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- Chris: nothing new, waiting for quotation for the rigid-flex tinning. | - Chris: nothing new, waiting for quotation for the rigid-flex tinning. | ||
| − | - Yesterday | + | - Yesterday at the tracking meeting we discussed possible modifications for the fADC125: increase of the gain to cover the whole 12 bit range that was requested by the CDC people. This is not acceptable for the FDC and as seen in the document linked above we are happy with the current version. Eugene insisted that we don't want to have two fADC125 versions which will delay their production and increase the costs, and that this will not solve the problem with the dynamic range. Now they are considering modification of the termination of the CDC pre-amps. In any case for us the fADC125 will not change. |
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== Engineering == | == Engineering == | ||
| − | - | + | - Bill is working on the package assembly jig plate and placed orders for: the new 3M tape gluing tool, cutter modifications, and spacer ring needed for the end window gluing. |
| − | - | + | - One rigid-flex sample set (two samples) that had higher radiation exposure was taken out of Hall C yesterday. It showed some residual radiation but we still were allowed to have it in 126. The two samples passed the electrical tests. Bill had |
== Chamber testing == | == Chamber testing == | ||
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- Simon showed results from his analyses of the cosmics data with fADC. First (page 554) it appears that the wires as "seen" by the strips are at an angle systematically: ~2mm over the length of the wire. So far the explanation is that the strip pitch might be different due to the cathode tensioning. To calibrate the strips (page 555) using the fact that the charges on the top and bottom strips are the same, first he makes "sagging" correction and then finds the calibration constants for each channel. After the first iteration, the resolution improves by ~10%. The fraction of the charge in the strip with the max signal is about 50% of the total charge (page 556). | - Simon showed results from his analyses of the cosmics data with fADC. First (page 554) it appears that the wires as "seen" by the strips are at an angle systematically: ~2mm over the length of the wire. So far the explanation is that the strip pitch might be different due to the cathode tensioning. To calibrate the strips (page 555) using the fact that the charges on the top and bottom strips are the same, first he makes "sagging" correction and then finds the calibration constants for each channel. After the first iteration, the resolution improves by ~10%. The fraction of the charge in the strip with the max signal is about 50% of the total charge (page 556). | ||
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Revision as of 16:28, 14 April 2011
April 14, 2011 FDC meeting
Agenda
- Production status (Dave)
- Electronics
- Status (Fernando,Chris)
- fADC125 requirements
- Cathode foil inspection
- Engineering
- Status (Bill)
- Radiation tests with conductive tape (Lubomir)
- Chamber testing (Lubomir)
- Other
Minutes
Participants: Eugene, Bill, Dave, Chris, Simon, and Lubomir.
Production
- 11 cathodes were inspected so far; one panel was damaged by us because of incorrect packaging.
- the first production cathode was glued tensioned and the frame was glued to it; cutting the flaps and the holes is next. Some of these procedures still require signatures. Cutting the second production cathode started with problems with the cutter. Bill thinks it is the granite surface that damages the blades. Using harder blade and treating the granite surface must help. Bill also made modifications to the cutter to prevent wobbling of the blade.
- the PCB ring was glued for the first production wire frame. Tests with light show the surface at the seams is not perfectly flat. Anatoly will work on this. Next steps: trimming the Rohacell OD on the wire frame and laminating the PCB ring. We will accelerate this so that we can work on the wire frame in parallel with the cathodes. Bill asked if it will be acceptable to use parafin to cover some parts of the Rohacell OD that is needed for the ultrasonic cleaning. Lubomir will investigate this.
- We received the solder wire (0.65mm) from UVA that we will use for wire soldering at the beginning. Al has progress with the software (for the Parker controller) used to find the wire position.
Electronics
- Chris: nothing new, waiting for quotation for the rigid-flex tinning.
- Yesterday at the tracking meeting we discussed possible modifications for the fADC125: increase of the gain to cover the whole 12 bit range that was requested by the CDC people. This is not acceptable for the FDC and as seen in the document linked above we are happy with the current version. Eugene insisted that we don't want to have two fADC125 versions which will delay their production and increase the costs, and that this will not solve the problem with the dynamic range. Now they are considering modification of the termination of the CDC pre-amps. In any case for us the fADC125 will not change.
Engineering
- Bill is working on the package assembly jig plate and placed orders for: the new 3M tape gluing tool, cutter modifications, and spacer ring needed for the end window gluing.
- One rigid-flex sample set (two samples) that had higher radiation exposure was taken out of Hall C yesterday. It showed some residual radiation but we still were allowed to have it in 126. The two samples passed the electrical tests. Bill had
