Difference between revisions of "Minutes-4-14-2011"

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# Chamber testing (Lubomir)  
 
# Chamber testing (Lubomir)  
 
# Other
 
# Other
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= Minutes =
 
= Minutes =
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- 11 cathodes were inspected so far; one panel was damaged by us because of incorrect packaging.
 
- 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 of the second production cathode started with problems with the cuter. 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 cuter to prevent wobbling of the blade.
+
- 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 cuter. 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 cuter 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.  
 
- 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.  
 
    
 
    
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- 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 ==
 
== Electronics ==
  
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- Fernando: ASIC contract was awarded. Still waiting from the CDC people to confirm the parameters of the pre-amps and the FADC125 shaping. If needed one can modify the attenuation on their HV boards without changing the parameters of the pre-amps and fADC125. We already confirmed that the parameters are OK for the FDC.
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- Rigid-flex assemblies: we received 480 recently and expect the last 135 in May. Fernando and Chris wanted to know how to proceed with the stuffing: to tin or not to tin the contacts. Tinning is needed if the conductive tape doesn't work and we have to solder. So far testing electrically the conductive tape we haven't seen any differences between the tinned and not tinned samples. Still mechanical tests with tinned samples have not been done yet. For now, we decided to order 50 rigid-flexes tinned and 50 not tinned so that we can continue with the production. The price will be higher by a few hundred $ due to the set-up fees (Eugene agreed). Depending on the results we will decide what to do with the rest of the rigid-flexes.
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- Chris: nothing new, waiting for quotation for the rigid-flex tinning.  
  
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- Last week we received the first two sets of foils from the mass production that were already inspected. The foils look better that those from the first article; still visible are imprints of the rollers on the foils but these will disappear after tensioning. Another two sets just arrived. Roger asked to put the invoice number together with the results of the inspection in a spreadsheet so that he can handle the payments. Regarding the storage of the foils, so far we leave them flat on a table after the inspection and Dave ordered shelvings for that, but Fernando and Roger are concerned with possible corrosion. We decided to try with one set to roll it back in the original packing which is a more compact way of storing.  
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- Yesterday to the tracking meeting we discussed  
 
    
 
    
 
== Engineering ==
 
== Engineering ==

Revision as of 16:02, 14 April 2011

April 14, 2011 FDC meeting

Agenda

  1. Production status (Dave)
  2. Electronics
    • Status (Fernando,Chris)
    • fADC125 requirements
    • Cathode foil inspection
  3. Engineering
    • Status (Bill)
    • Radiation tests with conductive tape (Lubomir)
  4. Chamber testing (Lubomir)
  5. 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 cuter. 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 cuter 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

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