[Tpe] [Fwd: TAR_TPE_eg5a.pdf]

[David Kashy]

Hi All,
Attached is a concept drawing that I'm starting to analyze for the new 
TPE target cell.
The material is chosen to be .005" Kapton  for the cylinder and the 
upstream and downstream caps. The ring with the ports is Torlon (also a 
polyimide) like Kapton. the feed tubes are aluminum as used in all other 
targets.

Please take a look and comment ASAP.

Questions:

1) what is the expected beam spot size at the target?
2) is there any need to go bigger or smaller OD?  (Smaller is better  
since there is less flammable gas but not mandatory)
3) What is the dose expected for the end caps. (Kapton shows a 24% drop 
in ultimate strength and a 5% drop in elongation at 77K when exposed to 
35MGy radiation dose. At 119 MGy the drop in strength is 38% amd 
elongation is  35%)

Thanks
Dave

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