RE: AK3

[Mulhauser Francoise <francoise.mulhauser@psi.ch>]

Dear Brendan,

This old AK3 target was used to create the AK3 ring, which stands at the
moment in the beam line. HDP had required, in November 2004, to have an
"annulus" made and sticked inside the MuCap beam extension nose, such that
muon stopping in this part would do so in AK3 material and not in stainless
steel.
If you look at the beam nose, you will see that the window is much smaller
than the pipe, due to the construction. Therefore, the inside flange is
covered by this AK3. It can easily be removed, because I just used some
double-face tape.

The small hole in the center of the remaining piece was made by the
workshop, to allow them to cut a perfect ring for me. Because it was not
known to me that this material was used, I never worried about it.

Hope I have answered your question and you now have a better view of it! 

Best regards
Francoise
-----Original Message-----
From: Brendan Kiburg
To: lauss@socrates.berkeley.edu; peter.winter@psi.ch
Cc: Peter Kammel; francoise.mulhauser@psi.ch; David Hertzog;
fegray@socrates.berkeley.edu; smclayto@npl.uiuc.edu;
tbanks@socrates.berkeley.edu
Sent: 18/10/05 11:38
Subject: AK3

Dear colleagues,
   I have arrived at PSI and begun rooting around for the old AK3 
target.  I found a 8x8 inch square of AK3 which has been cut up into a 
few pieces.  Specifically, there is a 93 mm disc from the center, and 
the outer edge of the square with a 146 mm circle missing from the 
center.  The annulus is not included in this box.  There is also a work 
order with the dimensions of the disc/ring dated November 19th 2004. 

To the best of my knowledge, this is the 2003 mulan AK3 target which has

since been cut up.  Francoise or Bernhard, could you please confirm 
this?  If this is the case, we need to consider if the 93 mm (diameter) 
circle a large enough target to achieve a successful mu+ measurement in 
early november.  It should also be noted that there is a small 1/8 inch 
diameter hold at the very center of the small disc.

Any thoughts or comments on this target issue would be appreciated.

Best regards,

Brendan