Minutes of the HV Board Telephone Meeting 
        =========================================


       Date:           08/09/98   15:00
       Participants:   M.Staric, S.Kopar, P.Krizan (Lubljana) 
                       R.Wurth, C.Padilla, U.Uwer  (Hamburg) 

 
  1. Connectors:
  --------------

  - For the connection between chamber adapter board and HV board
    connectors have been found
  
  - for the connection of the twisted pair cable no connetor 
    was found yet. A possiblity is direct crimping of the  
    cable to the board. -> not nice.

      
  2. Gas supply:
  --------------

  - Marco and Samo suggested a new way of supplying the gas: They
    foresee holse in the foils. The gas is inserted into the cells
    through specil gas-inlets.
    For details see:

      http://


  3. Design of HV Board: 
  ----------------------

  A 0th prototype has been designed and tested. This board is 
  single sided and has the same single side denisity  as the
  final board.
  The analog cross talk of the board is in the order of 3% compared to
  about 2% in case of the old type board. 

  
  4. HV grouping of the channels:
  -------------------------------

  The question about the HV grouping of the channels was raised. 
  The 16 channels of the two single layers should be powered separatly.
  
   
  5. Base plates:
  ---------------

  The new HV board might require changes in the ground routing on the
  base plates. Although the redesign of the base plates is not
  encountering any special problems the availability of new plates
  might delay the startup of mass  production.	C.Padilla therefore 
  underlined the urgency of the new or revised design.
   

  6. Tests of the prototype:
  --------------------------
 
  Marco wants to come to Zeuthen during the last week of September.
  We foresee a test of the board on a 4.5 m module. The exact dates
  must still be fixed.

 
  7. Holy and semi-holy requirements:
  -----------------------------------
  U.Uwer  promised to provide the specifications the HV board must
  fulfill. 

 

  8. Next Meeting:
  ----------------
  A next meeting is foreseen for Tuesday 15-09-98 at 15:00.