Some comments towards the discussions on module assembly  (A.Carter, Y.Unno)
 
 
  We would like to make sure that the outcome of the 1997 and 1998 work
schedule is an integrated programme for the whole SCT project with the
necessary facilities in place around the collaboration, with proven ability
to construct and assemble all the final module-types, and to carry out the
required testing to ensure strick quality control.
 
 
  We assume that component parts supplied to a construction centre will
already be subjected to earlier quality control, and that the centres will
only be required to carry out tests to ensure that damage has not occurred
in transit.
 
During 1997 
 
(A period of gaining experience and expertise)
 
1) Build electrically working modules, initially with partially stuffed 
devices, and then moving to substantial numbers of high quality, fully
working modules.
 
	- Specification of the electrically working module
	- How to obtain components (-> Notes below)
	    detectors, chips, hybrids, mechanical parts
 
2) Establish electrical testing quality procedures(even though the chips 
and DAQ hardware will not be final) 
 
	- What to test, i.e., testing specification
	    Testing/Calibration program
	- How to obtain sufficiently unified DAQ hardware installations
 
3) Fabricate and perfect all necessary assembly jigs
 
	- Assembly specification (tolerances?)
	- Using temporary/available jigs in the institutes
	- Iteration of design of jigs and feedback from institutes
	- programme of construction/provision of final jigs
 
4) Establish powering and cooling systems at all centres where multi-module
assemblies will be tested, with all necessary protection schemes.
 
	- Multi-module specification ie proposed scale of tesing
	- Cooling, Powering specification (including protection)
	- What cooling to use?
	- Who provides( and is responsible for implementation of)
          protection components?
 
5) A small number of the modules from each construction centre should form
part of the 1997 test beam installation.
 
 
For 1998
 
(Time for completing the assembly and testing techniques ready for 
large-scale production)
 
1) Assemble fully-equipped and high quality modules (e.g., strip yield of 
>98%)
	- Perfecting the module assembly specification 
 
 
2) Assemble 5 to 10 high quality modules in each construction centre for
the 1998 TSP programme 
 
3) Standarize the assembly jigs and all construction methods.
 
	- Final adjustments to the specifications for the assembly jigs
          and the detailed assembly methods
 
For 1999
 
   Full-scale module assembly starts
 
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 Some notes on various topics that relate to the construction project:
 
 
*  We need to have a fully integrated project with common documentation
   on ALL ASPECTS of mechanical and electrical specifications, to be used
   at ALL construction sites. 
 
Suggestions:
 
a) Use the web as a library 
 
	- Establish web page in each institute to open information to 
	others (Pointers are to be listed in the atlasinfo module 
	page)
	- post postscript files to be readily printable
 
 
b) Use FAX and e-mail for communication
 
	- Establish an address page (on the web) 
 
 
* Component parts will need to be exchanged
 
Suggestions:
 
a) Free exchange of components between centres/institutions would be the most
convenient, if possible
 
b) Alternatively we need to set up a finance scheme, either between
institutions or directly between vendors and relevant centres.
 
	- Establish a resource(-like) board for discussion and execution
 
* Detailed planning of how such exchanges can occur world-wide needs to be
addressed as soon as possible, particularly in the area of wafers.
 
* Production capabilities of each construction centre have to be established
as soon as possible(during 1997 or 98?) to allow overall project planning.
 
* The summed production rate will be vital to judging realistic schedules for
integrated systems tests.( Need for close BARREL-FORWARD liaising here)
 
* Overall quality monitoring procedures: internal site monitoring or to go
to a common central site?
 
* For a project with so many vital sub-projects, should we establish rapidly
a PRIORITY ACTION forum to make sure that at least a minimum set of VITAL
actions are taken, that otherwise could jeopardise the timescale of the more
detailed sub-items?( possible examples:(a) establishing the facilities in
each construction centre according to an agreed time-table. This would include
manpower with appropriate skills and experience for all stages of module
construction/testing(or equivalent programme in industry), together with all
the necessary hardware,(b) agreeing a timetable and procedure for establishing
the appropriate quality control world-wide, initially to target and authorise
module production status. ie how is the status of full-scale ATLAS module
production authorised at a centre, (internally, through external agreement,
how?)
 
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