From:	KEKVAX::UNNO         "Y. Nobu Unno, unno@kekvax.kek.jp"  5-MAY-1997 08:39:59.54
To:	ATLAS-SCT@ATLAS-LB.CERN.CH
CC:	UNNO
Subj:	Module components enquiry

Dear collaborators;

  Below is our enquiry of the module components which we require for the
module programme 97.  Would you please respond the enquiry by the end of 
this week?  The (draft) module programme 97 is available from the SCT
module page.

					Nobu & Tony
					Module convenors

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                  Planning the MODULES programme for 1997
                 ________________________________________

   The first realistic opportunity for the SCT institutes to progress
   the module work will be during the MAY ATLAS week. However we would
   like that meeting on MODULE prototyping to be equipped with as much
   information as possible on both designs and module components so 
   that we can agree a way forward.

   It is well known to the SCT institutes that many changes have occurred
   since the January CERN meeting, and these have already had a direct
   impact on the generally agreed prototyping schedule of final modules
   for this year. The main effects stem from significant changes that were
   activated by the TDR requirements on material, and have led to a new
   BARREL module design. The availability of both FE chips and associated
   hybrids is also likely to be delayed and is an area of concern. 

   It was agreed that modules constructed in the coming months should have 
   specifications as close as possible to those for the final SCT. However,
   we now propose that the chip delays should not also delay an initial 
   programme of module construction this summer. This is urgently needed to 
   address intrinsic features of thermal management and electrical performance.
  
   We therefore suggest that an initial programme could benefit from using
   some existing chip sets, and that these modules be followed as soon as 
   possible by those using the CAFE-M + ABC combination.

   We believe that sufficient ATLAS SCT wafers from 1996 are still available 
   for at least making initial "summer" 97 modules, but any information
   that groups could provide on availability of wafers that have the current
   SCT geometry and are for binary readout would be helpful.

   Below we therefore append an equiry list that includes all potential 
   items that could form part of this schedule. It would be very helpful
   if ALL INSTITUTES/GROUPS who have made commitments to supplying
   such items as part of their SCT activities could send us a brief note on 
   both the TIMESCALE and NUMBERs that relate to the availability of their
   appropriate items ;


       *  Front end chips:

            (a)  CAFE-M  +   ABC 

            (b)  (HAC)  +   LBIC  +  CDP

            (c)  (HAC)  +  SCT128B

       *  Hybrids for:

            (a)  End-tap :   CAFE-M + ABC

                             LBIC + CDP
                           
                             SCT128B

            (b)  Centre-tap :  CAFE-M + ABC

                               LBIC + CDP
                               
                               SCT128B
       *  Wafers for:

            (a)  Barrel modules

            (b)  Forward modules


      A further important issue concerns the basic final module designs
      that need to be agreed for the programme. We would appreciate
      feedback from groups on their reaction to both the BARREL and FORWARD
      module designs as given in the TDR. Criticisms and suggestions for
      achieving final designs are welcomed.

      Finally, we should note that the community agreed to aim at "multi-
      module" tests by the end of this year. This will require the
      data acquisition/processing to be available together with the necessary 
      powering and cabling schemes. Again, it would be helpful if the 
      groups who will be responsible for these areas could update the
      status of their work.
    
      Looking forward to getting your input, 

                    Many thanks,       Nobu and Tony.

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