Minutes of the 10 April 2006 phone conference

1. Approval of minutes of the previous meeting.
   Minutes have been approved, no correction was received about the table of requested MCC for FlexMCC and FlexLoaded repair.
2. News on bare modules and components assembly and deliveries:
   1. deliveries from AMS
      From last batch fo 20 modules: 2 VDDA short, 2 VDDD short, 2 second class and 14 first class modules.
      Today 20 new modules have been sent.
      Reworking of modules is on-going. Reworked modules with good bump quality are considered first class modules and assembled.
   2. deliveries from IZM
      The last 16 modules have been received from IZM.
      10 modules tested in Bonn are 9 OK and 1 with a misaligned chip. 6 modules have been forwarded to Dortmund where they had been visually inspected and will be tested in the next days.
      Only 2 more modules expected from IZM, to replace the latest not-accepted one. They may be reworked or completely new modules.
   3. distribution and flow of components (type 0 cables, shipping frames, FlexMCC)
      • Claudia would like to check avaibilability of pigtails needed to assemble the FlexMCC. Markus or Joern will check what is available in Bonn and will send out the needed amount.
      • Jean-Claude offered to return some shipping plates: they have been requested by Bonn. Markus is already in contact with Jean-Claude.
      • inventory of trashed flex hybrid
        (summary from LBL)
        In LBL there are 12 FlexLoaded which where trashed because they were misalgined when loaded to the frame. Some of them have bad MCC mounted on and used for wire bond test.
        In LBL they cannot use these flexes, but all barrel labs should be able to do.
        It is agreed to ship these flexes to Bonn, where MCC can replaced or loaded and wire bonded there. Afterwords they can be distributed accorting to manpower availability.
        Since it is clear there are not enough green MCC to comply with all the request in the minutes of the previous meeting, for the time being it is decided to use yellow MCC for replacement of bad MCC on FlexMCC and probably green ones for completing FlexLoaded.
        Maurice will ship ~30 yellow MCC each to Dortmund and Genova. Joerg may either collect from Siegen and Bonn the flexes to repair or distribute the MCC to these labs.
        Claudia needs to the the list of "trashed" FlexLoaded she found in Genova. Maurice suggests she look at the PDB comments to see why they have been trashed or, in case of doubts, contacts Rusty who should have all the accounting information.
      • distribution of AMS bare modules
        There 18 first class bare modules in Milano.
        They will be shipped 9 to Siegen and 9 to Genova.
        Next shipment should be done shortly after Easter and should include the 10 modules for Dortmund.
      • distribution of (mainly IZM) flex modules
        With the current stave loading speed Genova and CPPM are running out of Layer1/2 modules, while Wuppertal expect to load only few layer1/2 staves and move quickly to b-layer ones.
        Looking at availability of modules in the different labs, the forllowing shipments of Layer1/2 module should be done:
        • ~20 modules from Bonn to Wuppertal (that would be all Wuppertal needs)
        • ~20 modules each to CPPM and Genova from Dortmund
        • 10 modules from Siegen to Genova.
        
        (updating B-layer threshold)
        It is agreed to keep to 400 the number of modules kept in reserve for the b-layer, but to keep updating the b-layer ranking threshold, in order to free good module as long as better ones are coming from the production chain.
        Attilio will distribute an updated version of the ranking application with the proper cut at every update (a version with threshold reduced to 60 has been released contestually to these minutes).
3. Inventory of hospitalized modules:
   Are we in a situation to assess MCC requests?
   Update of wiki page
   The assesment of MCC request requires to complete the debugging of existing modules. For that the debugging procedure in the wiki page should be set up. As an initial stage, Claudia will insert the first draft she gave to Maurice.
4. Stave testing/ranking
   • Last week there were complaints about the bad behaviour of inserted stave 4004, which was the first inserted stave tested in Bonn.
     The next staves showed a much better behaviour, so the first stave result may be due to the fact this initial stave was originally selected by Nanni among the worst ones or to a learning curve in the insertion procedure.
   • Checking stave ranking with Nanni, it seemed the mechanical penalties for reworked bare modules or MCC are so high that they hide real module performances. They were OK to split single modules in classes according to the reworking done, but are less meaningful on staves, where modules have already resisted to a lot of stresses.
     There is also the problem to properly emphasize the damage on modules during stave loading and probability of it to increase. At present there are two main penalties which enhance this effect in ranking:
     * new spots of disconnected pixels trigger the 280 penalty,
     * increased number of bad pixels is always doubled in ranking.
     Attilio will release a StaveRanking application with reduced mechanical penalty and will try to see if increased number of bad channels get a reasonable weight in stave selection.
5. AOB.

   Next meeting will be help on April 24^th