Minute of the 03 April 2006 phone conference

1. Approval of minutes of the previous meeting.
   Some remarks by Markus about module debugging have been included in the minutes.
2. News on bare modules and components assembly and deliveries:
   1. deliveries from AMS
      6 reworked modules received last week have been tested. 2 are of first class, 3 of second class and one has been trashed.
      Today AMS has shipped 20 new modules.
      8 modules which where kept for drying in N₂ atmosphere have been finally processed and will be tested today or tomorrow.
      (quality of AMS Modules in Dortmund?)
      The summary of AMS modules assembled in Dortmund is visible at the URL: http://e4.physik.uni-dortmund.de/~walbers/Module/AMS/.
      There is clear damage with respect to bare module probing and it appears also worse than what observed in Siegen. Probably this is due to the fact assembly rate in Siegen was slower and they managed to get some feedback from the initial damaged and tried to be more careful with AMS modules, with the latest ones having little additional damage.
      In any case there is a confirmation of the pattern that there is no increase in damage between ASSY and FLEX test.
      Attilio will try to make a comparison on the additional damage visible in Siegen, Dortmund and Genova. It may be necessary to redirect back to Genova some modules expected to be assembled in the German labs.
   2. deliveries from IZM
      16 new modules received last week. 11 tested in Bonn: 1 bad sensor, 1 bad bumps, the rest is fine. 5 have been received today in Dortmund.
      Next delivery of 16 modules, all reworked, should fulfill the contract.
      After the end of the test of these modules, all German bare module logbooks should finished off, in order to compute the final statistics.
   3. distribution and flow of components (type 0 cables, shipping frames, FlexMCC)

      inventory of trashed flex hybrid
      LBL information is still missing.
      With respect to previous meeting, there are updates from Dortmund and Genova.
      Joerg's report shows there are at most 12 FlexMCC which could be repaired by replacing MCC.
      Claudia's report can be summarized as:
      - FlexMCC+pigtail (details)
         6 have been recovered
         at most 9 can be recovered by MCC replacement
      - FlexMCC no pigtail (details)
         9 can be recovered by MCC replacement
      - FlexLoaded (details)
         12 FlexLoaded can be equipped with MCC.
      As to the last point, Claudia is cross-checking with Maurice if they are actually electrically OK.

      So, at present, and pending LBL inventory, MCC are to be used for:

      • reserve in case of MCC damage while un-potting and rebonding ~10 modules in the German labs (~50% each in Dortmund and Wuppertal)
      • reserve in case of MCC damage while un-potting and rebonding the last two old staves
      • replace the MCC in 42 (7 BN + 12 DO + 18 GE + 5 SI ) FlexMCC
      • load the MCC in 18 ( 2 BN + 12 GE + 4 SI ) FlexLoaded

      Distribution of modules
      As announced at the last meeting, the different labs have not a lot of Layer1/2 modules in order to go for more than the current month. This is especially relevant for CPPM and Genova which have a rate of about 2 staves/week. Therefore at the next meeting a redistribution of IZM modules is to be agreed.
      To perform that properly an assessment of available modules needs to be done. Before the meeting Attilio has uploaded the latest ranking table from the PDB, but Claudia has found some disagreements. Therefore it is better to cross check that table: the relevant worksheet is "Module Location" which contains the information about how many B-layer and Layer1/2 modules are available in the different labs.
      Also the number of B-layer modules can be checked by varying the B-layer ranking threshold in cell C30 and recalculating (key F9).
      Actions:

      1. Attilio should put a version with the B-layer flag equal to the one in the ranking application (ranking of 70) (done shortly after the meeting)
      2. All the labs should cross check the amount of modules they have (after the meeting, Siegen is almost in perfect agreement, Dortmund have 39 modules which do not uppear in the PDB yet, Genova has about 20 modules more)
      3. Attilio will cross check with Kendall how many modules are exactly available in Wuppertal and for how long they will last.
      
      
3. Inventory of hospitalized modules:

   Update from Dortmund (spreadsheet)
   2 major classs of problems with modules:

   • MCC which could not be contact: this is in most case due to weak pigtail connector, some modules have already been fixed.
   • tuning problems: this are generally due to wrong calibration files (the chip in the PDB is not the one actually loaded on the module). In most cases it has already been possible to find the right chip, but since it is often nominally loaded on another module, it requires some work to correct the PDB.
   
   There also few different problems listed in the spreadsheet.

   Update of wiki page
   Last week Claudia prepared a debugging summary for Genova hospitalized module: HospitalDebug.ppt. This is an indication of which kind of information should be collected by module debugging.
   Maurice hopes to work on the wiki page during the current week.

4. AOB.

   Markus reports of a high increase of masked pixels for AMS modules in the STAVE test of pipe-inserted staves (after the meeting Markus sent some pictures).
   Such a big effect is not seen in CPPM and needs to be understood.
   In some previous measurements there was high leakage current and noise due to the temperature gardient induced by nearby setups (mainly the burn-in chamber), but this is not the case anymore.
   A suggestion is to try a retuning of the modules, in order to check this is not a simple tuning effect (same configuration file as the original STAVE and FLEX test is used).

   Bonn disk server, crashed one week ago. Not all RDB information is online now. If some special data are needed, please ask Joern. addressed to Joern.