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	id JKC07QAX; Wed, 24 Apr 2002 11:41:08 -0400
Reply-To: <meng@bnl.gov>
From: "Wuzheng Meng" <meng@bnl.gov>
To: "'Lee, Yong Y'" <lee3@bnl.gov>,
	"'Raparia, Deepak'" <raparia@bnl.gov>
Cc: "'Badea, Sorin V'" <badea@bnl.gov>,
	"'Tuozzolo, Joseph E.'" <tuozzolo@bnl.gov>,
	"'Meng, Wuzheng'" <meng@bnl.gov>
Subject: New Design on SNS 26S26
Date: Wed, 24 Apr 2002 11:46:05 -0400
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   YY/Deepak, 

    Please review the following parameters for the SNS ring 
    large chromaticity sextupole design. 

   The new design involves:
   (1) changed the conductor from 3-layer to 2-layer
   (2) pole width slightly narrower
   (3) pole surface radius changed slightly
                                     
   I have finished 2d and 3d analyses. Here are the brief --- 

   (A) For 1.0 GeV
        By applying I=287 A (23 turns per pole), 

       B (at R=13 cm) = 1.81 kG

       Half Int(b3)dz is 2.978e4 g-cm (at R=13 cm)
       ---- equivalent to total Int(G)dz  7.0486 T/m
       (Required 7.05 T/m, J.Wei Note 076, p.33)

       Half Int(b9)dz is 3.3 g-cm (or 1.1e-4 level)
       
   (B) For 1.3 GeV
        By applying I=345 A (23 turns per pole), 

       B (at R=13 cm) = 2.17 kG

       Half Int(b3)dz is 3.5778e4 g-cm (at R=13 cm)
       ---- equivalent to total Int(G)dz 8.486 T/m
       (Required 8.55 T/m, J.Wei Note 076, p33)

       Half Int(b9)dz is 3.8 g-cm (or 1.1e-4 level)

       We need a little bit more current, say I=348 A for 1.3 GeV

    Wuzheng Meng