[Sneap] Quadrupole Lens

[David Weisser]

Ludwig,

Our experience with "replacement" coils has been bad.  HVEC replacement
coils with nominally the same number of turns produced significantly
different fields than the original ones.  This was for a 3" HVEC quad. Alan
Cooper reported on this at the last SNEAP.  Although we don't understand why
a coil with supposedly the same number of turns should produce a different
field, we decided that we had to use them is sets of 4 in a quad singlet
rather than replace just one.

I understand that the decommissioning of the Minnesota MP will be handled by
Jeff Ashenfelter (ash at mirage.physics.yale.edu) from Yale but that the
process is delayed. I strongly suggest getting 4 coils or the whole quad.

David


********************************************
D.C. Weisser
Nuclear Physics Department
Research School of Physical Sciences and Engineering
Australian National University
Canberra A.C.T. 0200
AUSTRALIA

Tel:    + 61 (0)2 6125 2080
Fax:    + 61 (0)2 6125 0748
Mobile: + 61 (0)414 249 209

david.weisser at anu.edu.au

-----Original Message-----
From: sneap-bounces at tunl.duke.edu [mailto:sneap-bounces at tunl.duke.edu]On
Behalf Of Ludwig Beck
Sent: Tuesday, 25 November 2008 2:59 AM
To: Symposium of Northeastern Accelerator Personnel
Subject: [Sneap] Quadrupole Lens