From: Roger Carr [mailto:Carr@SLAC.Stanford.edu] 
Sent: Monday, November 21, 2005 5:18 PM
To: Anderson, Scott D.; Wolf, Zachary R.
Cc: Emma, Paul J.
Subject: Everson Tesla Quad

Gentlemen,

Paul Emma and I have discussed the need for 6 quad magnets that are presently designated
as QEs, but need to produce an integrated field of only 30 kG-m, not 100 kG-m that the
QE is capable of.  This is with some padding built in; in fact we may need only 25 kG-m.
The Everson-Tesla quad produces 18 kG-m, with a very manageable temperature rise at its 
maximum rated current.  We think that this magnet may be able easily to produce 25 or 30
kG-m and still run cool enough, but we would need to test this.  We would therefore like
to request that your group apply enough current to the existing ET quad magnet to obtain
30 kG-m, and see if this produces a temperature rise of more than 25 C, which is the
SLAC official (Cherrill Spencer) redline.
Apparently you got to 18 kG-m with less than 10C rise, so this seems like a reasonable
hope.  You may wish to hook up the thermal switches that are mounted on the ET magnet,
to avoid any unfortunate meltdowns.

Thanks,

Roger
-- 
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Roger Carr
Linac Coherent Light Source
Stanford Linear Accelerator Center
MailStop 102, Building 280B, room 137
2575 Sand Hill Road
Menlo Park, CA 94025