From steve@mail.hep.man.ac.uk Wed Jul  7 12:15:11 1999
Date: Tue, 6 Jul 1999 14:50:18 +0100 (BST)
From: Steve Snow <steve@mail.hep.man.ac.uk>
Subject: thermal model of inner and outer modules


To: those interested in forward SCT cooling.

Dear Colleagues,
                I have recently completed an simplified thermal analysis 
of the forward SCT modules, their cooling blocks and their environment.

The main conclusion is that the baseline inner and outer ring modules, 
mounted on the latest version of Andy Pilling's cooling block, will 
work thermally provided that the coolant temperature is below -20 C.
A fully split cooling block would give some benefit, allowing the coolant 
to be run 2.5 degrees warmer while keeping the same silicon temperature.

I find that the dominant route for heat transfer from the hybrid to the
silicon is by convection and radiation, not by conduction through the 
fan-ins. 

Many more details are given in a set of transparencies which are on the
web at:
http://hepwww.ph.man.ac.uk/groups/atlas/module/shef-transp.html

regards, Steve Snow.