From:   FNALD0::GALLAS  "Elizabeth Gallas - UofTX Arlington" 
                                                        24-JUL-1998 14:24
To:     KOTCHER,ABID,FNAL::MATESKI,FNAL::HJS
CC:     @ME:ICD_UP,SMTP%"RIJSSENBEEK@sbhep.PHYSICS.SUNYSB.EDU",
        SMTP%"yamin@bnl.gov",SMTP%"SDESAI@GRAD.PHYSICS.SUNYSB.EDU",
        FNAL::DFM,CHRISTENSON,GALLAS
Subj:   follow up to Notes - 
        FPS/ICD Mechanical Meeting Week of July 7-11, 1998

Hi all,

This is a follow up to the 
Notes from the FPS/ICD Mechanical Meeting the Week of July 7-11, 1998
which you can find through the Run II ICD home page:
    http://www-d0.fnal.gov/hardware/upgrade/icd/icd.html
    http://www-d0.fnal.gov/hardware/upgrade/icd/icd_notes.html
    http://www-d0.fnal.gov/hardware/upgrade/icd/icd_notes_9807_mech.txt
These notes will also be posted in the same location.

Please let us know your concerns,
Elizabeth
-------------------------------------------------------------------------
STUD LOCATIONS:

JIA LI:  has put DXF and DWG files of the updated ICD stud locations on
atlas2.phy.bnl.gov .  
These drawings will also be put on his web page.
As of the last iteration, the ICD and FPS stud locations overlapped by
4mm since they were at the same phi.
In order to avoid the overlap, Jia Li proposes that rather than a single
inner stud between adjacent modules, we go back  to two studs straddling
the ICD module boundary line (and the FPS rib studs and bosses).
ICD group requests that these new fixtures be nuts (bosses) on the EC
(rather than studs) since it will probably be easier to use a
screwdriver in this area rather than a wrench.
Jia Li should have a design for the support brackets early next week
which will include features which prevent lateral movement of the
modules.

JACK should include these inner ICD boss locations on the FPS stud/boss
locating fixture.  
The 4 outer ICD studs per module will be located with a separate fixture
referencing the inner bosses.
The current design has 4 outer stud locations per module 
(2 outer studs for module support, 2 for cable stress relief bar) 
but these may change when final connector locations are determined.
-------------------------------------------------------------------------
FPS CABLE ROUTING:

ABID has generated a new cable routing plan for the FPS where cables
run over the ICD tile modules.  EG will fax them to A.White and J.Li.

Here is a picture of an ICD tile  module (dimensions are approximate and
not to scale)

                    inner width 32 cm
                    (folded Al edge)
                /---------------------\         ^
               /                       \        |   bottom length
              /                         \       |      17.5 cm
             /         BOTTOM            \      |
            /                             \     |
           ---------------------------------    V
          /    cover inner width 38.5 cm    \
         /                                   \
        /                                     \
       /                                       \
      /                                         \      cover length 
     /                                           \     33.5 cm
    /                 COVER                       \    including the 
   /                                               \   tuck flap 
  /                                                 \
 /                                                   \
/-----------------------------------------------------\
            cover outer width 51 cm

The ICD group suggests that FPS cables be routed only on the bottom of
the module, not on the cover (to avoid disturbing light tightness).  
Moreover, cable support fixtures should be located within about 12 cm of
the  inner edge or sides of the bottom of the box so that FPS cable
weight does not distort the box in the middle.
If the box is bowed even slightly, this could pull Tyvek wrapping
away from the scintillator creating a nonuniform reflective surface.
Andy determined this 12 cm based on the flexibility of the prototype
aluminum box we have at UTA, which has all the features of the final
design.