RICH MECHANICAL MEETING AGENDA

			1/xx/03 -HC 


C0 -RICH Tank Topics,
	
Liquid radiator thermal analysis
	Quartz glued to a plastic vessel causes large stresses and deflections
	in the vessel. Quartz glued to a plastic vessel backed by a carbon fiber
	skin has two advantages. The first is the c5f12 doesnt touch the carbon
	fiber and the second is the carbon fiber thermally stabilizes the 
	plastic. A footnote here is that the plastic sheets typically only come
	96" long not 2.5 meters (98inches). Results are shown on the web page.
	Note the thermal bowing is about 1 mm for a 10 deg F temp change.

Liquid radiator prototyping. 
	To address thermal issues, we may want to purchase a 3mm quartz rod, 
	available at about $1 per foot,and glue it to a plastic/carbon
	substrate that is the full 2.5 meters long and the correct crossection,
	then the thermal issues may be investigated and also we could 
	measure the amount of curvature that occurs in the assembly during
	temperature changes. 

Quartz quotes, 
	Getting quotes on the order of $20,000 for quartz. Quote is
	based on pieces 20 inches square. 
	A 6" square 3mm thick is available for $50.  
	It may be possible to fuse smaller pieces into a single larger 
	sheet. Fabricators then worry about handling and shipping 
	the large sheet.
	
MAPMTs
	Current thought is to support the MAPMTs off of a socket in the
	electronics card. The electronics card would then be attached to a
	backbone structure - possibly a "C" channel. Four MAPMTS will be
	attached to each electronics card. The C channel will be attached to the
	tank using bolts at the ends of the C channel. If a curved MAPMT surface
	is desired, spacers of different thicknesses can be put between the 
	electronic card and C channel. Most likely the outer cover for the MAPMT
	electronics will provide the gas seal between c4f10 and air (the MAPMTS
	will operate inside the tank gas volume. The tank will have to be
	drained to remove or repair a MAPMT). Some 3d sketches are shown on the
	web page.

Rear window 
	Parts are here for the prototype but the technicians are not available
	due to the beam shutdown.

Test Beam topics,

	HPD array for the test beam Syr. should have mechanical Drawings.
	
	Comments about the status of the test beam stand fabrication....
	
	Comments about the mirror 3 point mount evaluation from Syracuse....

	Comments about the thermistors located on the HPD readouts. Rich Schmitt
		requires a Volts vs. temperature curve.
	
	Herman Still needs progress on the gas recirculation system and 
	monitoring system. The techs are currently busy with the beamline.
	
	Comments about HPD electronics cooling for the test beam. Estimate of
	the number of watts inside the enclosure??
	
	
Material compatibility issues
	To use carbon or not to use carbon, that is the question.
	What about mirrors, mirror support panel, windows.
	What other material compatibility issues await us??
	
Acrylic availability
	Need to investigate not using acrylic windows for the pmt arrays and
	also possibly not the mapmts......

WBS and cost book
	Waiting for fermi cost estimates on the HPD hexad, beehive assembly
	fixture, and 3 point mirror mounts....Have a general cost for the RICH
	tank.