Tilted AK3 and aluminum target

[Peter Winter <peter.winter@psi.ch>]

Dear all,

since we have plans to run with other targets as well, we are trying to 
think of a solution for that. To cover the circular whole (radius r) 
with a 45 degres tilted target, we probably need an ellipse with the 
axis a=r and b=r / cos(45). We found a spare plate of 1mm thick AK3 send 
by Bernhard for the last MuCap run. One of these 25x25cm plates is used 
for the MuCap target. The other one could serve for our ellipse. Now, 
has somebody experience in cutting AK3 (Bernhard?)? The Hallendienst 
gave us a metal scissor in order to avoid enormous heat production like 
with sawing.
For the aluminum target there is 1, 1.5 or 2 mm thick aluminum in the 
storage from which we could cut a disc. I would propose for both targets 
to have a ring (like the column at the target) with 8 inch outer 
diameter and ~7.5inch inner diameter where the targets can be fixed to. 
That can be produced without opening the current beam pipe since for 
that we have to remove the Apiezon. Only when the target is exchanged we 
have to do that. Then the ring would go in place of the current target 
holder. For the tilted target we could for example saw a 1mm thick slit 
with 45 degrees into the ring where the target slides in to be held 
without screws. The aluminum disc could be just screwed onto the ring.
Peter

-- 
Dr. Peter Winter
OBEA 10/A
Paul Scherrer Institut
CH-5232 Villigen-PSI
Tel: +41 56 310 4786
Fax: +41 56 310 5353