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	id V36LZTXL; Wed, 23 Oct 2002 16:04:35 -0400
Reply-To: <meng@bnl.gov>
From: "Wuzheng Meng" <meng@bnl.gov>
To: "'Lee, Yong Y'" <lee3@bnl.gov>
Cc: "'Tuozzolo, Joseph E.'" <tuozzolo@bnl.gov>,
	"'Wei, Jie'" <wei1@bnl.gov>,
	"'Mahler, George'" <mahler@bnl.gov>,
	"'Raparia, Deepak'" <raparia@bnl.gov>,
	"'Meng, Wuzheng'" <meng@bnl.gov>
Subject: Narrower Poles for 26Q40
Date: Wed, 23 Oct 2002 16:06:40 -0400
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   YY, 

   The change is small. If I understand correctly, 
   15 mil is less than 0.4 mm. I used a 2d model,
   made each side 0.2 mm (or 0.02cm) narrower. The 
   ratio (to quadrupole term) is on the order of
   E-6.

            Original Case         Narrower Case
           By (g)    Ratio        By (g)  Ratio

   quad  -5603.15098   1.0      -5603.15531  1.0
   12-p      3.00836  -5.37e-4     3.02621 -5.40e-4
   20-p     -5.22699  9.33e-4     -5.21394  9.31e-4

   I assumed coil geometry and other part of the pole
   contour have no change at all. 

   Please comment.

   Wuzheng