Difference between revisions of "Minutes-11-4-2010"

From GlueXWiki
Jump to: navigation, search
Line 32: Line 32:
  
 
- Chris: by Wednesday we will have all the PCBs populated. The company sent two pictures (link above) showing delaminations on two of the boards. They claim the delamination was there when the boards arrived. But Chris would have seen it!? Roger: the heating cycle they use may cause delamination. Chris will ask
 
- Chris: by Wednesday we will have all the PCBs populated. The company sent two pictures (link above) showing delaminations on two of the boards. They claim the delamination was there when the boards arrived. But Chris would have seen it!? Roger: the heating cycle they use may cause delamination. Chris will ask
−
the company for information about this.
+
the company for information about this.  
  
−
- Roger: the cathode foil Gerber files will be sent right after the meeting. The extra connectors were included.   
+
- Ultrasonic cleaning: according to Chris 6.6gal Vigon costs $285; we need 14gal. Not clear how often we have to change it.
 +
 
 +
- Roger: the cathode foil Gerber files will be sent right after the meeting. The extra connectors were included. Will have the first article by Dec 3.
 +
Roger got two quotations and two "no-bids" for the rigid-flex which is good enough for the submission of the PR tomorrow.   
 
   
 
   
−
- Fernando: the first article signal cables will arrive by mid November and Chris is working on a board to be used for testing. The solder material (japanese) recommended from UVA is no longer available. Chris ordered similar materialial from other company to exercise. Working on the sole source procurement of the ASICs. Fermilab is also intersted in the same ASICs and Fernando discussed if we can share with Fermilab the costs
+
-   
−
for the mask (~$100K).
+
−
 
+
−
- The contract for the cathode foils was awarded. Alflex is waiting for the Gerber files from Roger; the files are ready waiting final approval from Bill and Fernando. After that we will have the first article in three weeks, then we have one week (around Thanksgiving) to approve it
+
−
before the start of the whole production.
+
−
 
+
−
- Rigid-flex: Roger is waiting for quotations from two companies after some additional explanation concerning the coating. Allflex already decided not to bid for this. Then Roger will submit a PR for 500 rigid-flexes. Once more we discussed the technique to be used for soldering to the cathode foils. Fernando prefers to use conventional soldering instead of using conductive film; the argument: the later technology exists for
+
−
only 4 years and we are not sure if the soldering will work for 10 years. We will have plenty of material to exercise this and to measure the failure rate of the standard method and to try the new one. After that we should make a decision.
+
−
 
+
−
- Beni showed a drift time distribution (page 531) as measured with fADC125. It has 8ns structure coming form the 125MHz clock. Gerard doubts that such structure should appear. Beni, Gerard, and Fernando discussed the ways one can measure the time between the trigger and the phase of the fADC clock that is needed to improve the timing resolution from the fADC. In the experiment the clock will be common and a special module will provide this opportunity. For now, Gerard suggested plugging the trigger into the fADC to measure the trigger time.
+
  
 
== Engineering ==
 
== Engineering ==

Revision as of 17:20, 4 November 2010

November 4, 2010 FDC meeting

Tentative Agenda

  1. Production (David)
    • Blue Crab status
    • Frame lamination
  2. Electronics (Fernando, Chris, Roger)
    • Update on PCBs: delaminated PCB1 and PCB2
    • Cathode foil and rigid-flex procurement
    • Cathode foil inspection plan
  3. Engineering (Bill, David)
    • Wire stringing status; position measurement system.
    • Other
  4. Full-scale prototype tests
    • status, timing with fADC125 (Beni)
    • wire offset studies (Lubomir)
  5. Other


Retrieved from "https://halldweb.jlab.org/wiki/index.php?title=Minutes-11-4-2010&oldid=23325"