Dear All,
The attached file is a PostScript output summarising the most up to date
results on the UK forward module. 
The module is the SAME one as used for the data presented in December. 
The changes are:-

1) 	New mounting block with a direct fluid path with thermometry in the 
	fluid flow. 
			(The old block had a pipe 'floating' in thermal
				grease and no thermometry).

2)	10 mm x 10 mm x 2 mm aluminiumm 'heat spreader' mounted on top of
        module at mounting point.
 
        This performs the following:-
		a)	Increases the thermal conductivity of the 
		    	module at the mounting point to better equalize
                    	the temperature distribution at the mounting
		    	point leading to better heat conduction through
	      	    	the thermal grease interface.
		
		b)	Appiles a uniform pressure over the entire 
			mounting area to ensure a uniform grease 
			thickness.
			NB. The thickness has been measured to be 30
			    microns

3)	Better understanding of thermometry.
	
	The minimum module temperature is better determined. 

4)      Hybrid power reduced to 3 W
	
	To agree with other module groups.


The data show the temperature distribution measured with 3 W on the hybrid
and 1 W on the silicon. The design of the cooling contact at the far end
is chosen to give the same silicon temperature at both ends of the
module. The data were measured in ambient air with the fluid temperature
adjusted such that the ambient temperature lies between the minumim and
maximum silicon temperatures. This reduces the effect of convection on the
measurements. 

The figure on the left shows the measurements plotted as a rise above the
coolant temperature. The one on the right shows the same data plotted as a
rise obove the minumim module temperature.

These measurements have been repeated using the hybrid component only
(with the heater wires replaced by resistor chips) and similar results are
obtained.

Tim.