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[Opal] Re: SBend Results and Questions

Chronological Thread 
  • From: raoyn AT
  • To: "Andreas Adelmann" <andreas.adelmann AT>
  • Cc: "Norman Huang" <norman-huang AT>, "Rick Bartman" <krab AT>, "Thomas Planche" <tplanche AT>, opal AT
  • Subject: [Opal] Re: SBend Results and Questions
  • Date: Thu, 17 Nov 2011 22:27:31 -0800 (PST)
  • Importance: Normal
  • List-archive: <>
  • List-id: The OPAL Discussion Forum <>

I forgot to say in my previous e-mail that the inital Delta p/p of this
particle is zero.


> Andreas,
> Further to Norman's e-mail, I want to make it clearer as to what the
> issue is.
> What he did was a simple test to OPAL: track a single particle through
> a 90 degrees
> magnetic S-bender with the fringe field turned off. The initial X is
> -0.004m while initial
> PX is 0. (Initial means at the entrance of the magnet.) The X,PX
> values were recorded
> at each step of the numerical integration up to the exit of the magnet.
> As a result of
> OPAL tracking, X vs S appears to a cosine curve as expected (please
> look at Page 3 of
> Norman's summary "SBEND-results.pdf"), while PX vs S shows funny numbers
> near
> zero instead of a sine curve (see Page 7). I don't understand this.
> We cannot figure out
> why from your source code.
> It makes no sense to track multiple particles if a single particle
> tracking does not give
> correct result. We may have misunderstood something. Could you take a
> careful look at
> Norman's input and output files and help us out?
> Thanks in advance.
> Yi-Nong
> Norman Huang wrote:
>> Yi-Nong and I do not know how to interpret these SBEND results. Please
>> take a look at my test cases summary. Attached are the OPAL input file
>> (, Enge coefficient file (FAND1.T7), single particle tracking
>> data (particleInfo_Fringe.txt, particleInfo_NoFringe.txt)
>> The 12 columns for the particleInfo files are:
>> Bx By Bz X_ref Y_ref Z_ref Px Py
>> Pz X_local Y_local Z_local
>> Regards
>> Norman

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