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Re: [Opal] Enge Coefficients

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  • From: Steve Russell <srussell AT>
  • To: opal AT
  • Subject: Re: [Opal] Enge Coefficients
  • Date: Wed, 28 Sep 2011 12:51:03 -0600
  • List-archive: <>
  • List-id: The OPAL Discussion Forum <>

One other thing to note, the Enge coefficients define the magnet's fringe field, which are responsible for edge focusing. If you input a hard edge magnet, you will not get the correct edge focusing.

On 09/28/2011 07:07 AM, Andreas Adelmann wrote:
Hi Chris,
From Ch. Mayes (posted by AA )

How crucial is it for SBEND elements in OPAL-T to have a FMAPFN that contains
the Enge coefficients? As it stands, OPAL won't run without this file.
What I am asking, is if some things like the gap and the field integral can
be specified in-line with the element definition, instead of requiring a file.
This is currently not available in OPAL-T.

Also, if nothing is specified, what is wrong with having a hard-edged magnet?

I do not know what's happen if you set the Enge coefficients to mimic a
hard-edge magnet,
however I can imagine that maybe the CSR or integration routine having


Dr. sc. math. Andreas (Andy) Adelmann
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Steve Russell
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org:Los Alamos National Laboratory;ISR-6
adr:MS H851;;P.O. Box 1663;Los Alamos;NM;87545;USA
email;internet:srussell AT
title:Technical Staff Member
tel;work:(505) 665-3712
tel;fax:(505) 667-8207

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