HEC Meeting
							08.07.99

   Module construction at "Molniya" and IHEP


   S.Denisov, V.Koloskov, A.Krjutchkov


1. Copper plates and SS pieces for two rear modules have been produced in 
   "Molniya" and transported to MPI for evaluation of quality and 
   assembly.

2. During the copper absorber production the main dimensions were under 
   careful control. For example, absorber thickness was measured at 8 
   points. For each plate rms deviation sigma_p from average thickness 
   t_mean was calculated. The parameters of sigma_p distribution for 34 
   produced plates are: Mean value = 0.14E-01 mm, RMS = 0.68E-02 mm.  
   The parameters of  (t_mean-t_0) distribution (t_0=25 or 50 mm) are: 
   Mean value = 0.31E-01 mm, RMS = 0.30E-01 mm. The spread of  
   (t_mean-t_0)  for 33 plates of 34 is well within the 100 micron tolerance 
   and ranges from -50 to +70 microns.

3. To compensate the spread of absorbers in thickness 5 groups of spacers 
   were produced with a step of 10-20 mc. In documents sent with absorbers 
   there are recommendations what group should be used with the given 
   plate.

4. Production of 3-d and 4-th modules is in progress. 12 plates have been 
   cleaned and packed already. We expect to have all absorbers and SS parts 
   ready in 3-4 weeks. 
   
   Production of 5-th and 6-th modules just started: 18 
   plates were cut, 6 of them were preliminary machined.

5. Module production in "Molniya" will be stopped when 3-d and 4-th 
   modules are completed and will be continued in September. Thus 
   absorbers and steel parts for 5-th and 6-th modules is expected to be 
   ready at the end of October or beginning of November.

6. Fabrication of the stainless steel items of the support structures for two 
   HEC2 modules which must be produced at IHEP for MPI in the 
   framework of the ATLAS Arg. 36/99 will be started in July, machining 
   of the copper plates - at the end of August (provided we shall not meet 
   big custom problems).

7. The dust free stacking site is close to completion, but not finished yet, 
   though we planned to do it by July. The main reason for this is the lack of 
   manpower in the summer months.
   7.1. The building body is fully constructed with exception of internal       
        doors, which will be made and installed in two weeks.
   7.2. The air conditioning system is under assembling and will be 
        switched on for testing in a week. All components and materials are 
        in stock.
   7.3. One stacking table will be ready in a week, the fabrication of the 
        second is temporary postponed in order to start fabrication of the 
        vacuum box for drying HC mats. The storage for copper plates in 
        the stacking site is under construction. 
  
        According to revised plan all 
        works will be fiished by the end of July.

8. New ISTC Proposal to continue HEC module construction in "Molniya" 
is under preparation. In the case of approval 7 additional modules will be 
produced in "Molniya" in 2000-01.