opal AT lists.psi.ch
Subject: The OPAL Discussion Forum
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- From: Van de Walle Jarno <jarno.van.de.walle AT sckcen.be>
- To: Chris Hall <chall AT radiasoft.net>
- Cc: "Adelmann Andreas (PSI)" <andreas.adelmann AT psi.ch>, "opal AT lists.psi.ch" <opal AT lists.psi.ch>
- Subject: RE: [Opal] beamline simulation for low energy radioactive ion beams
- Date: Thu, 7 Apr 2022 14:48:21 +0000
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Hello,
Indeed that SIGMAPX and SIGMAPY parameters were completely off. Thanks for this, it makes sense now. Actually, I didn’t pay attention to the DISTRIBUTION line, since I converted my MADX file through SIREPO to an OPAL input file. I had to clean the input file a bit, but I skipped the –rather crucial- DISTRIBUTION line … My mistake.
Thanks for the support in any case! Wbr - Jarno
From: Chris Hall <chall AT radiasoft.net>
Hi Jarno,
Have you checked the momentum spread values in your distribution command? They seem like they could be too large.
The spreads in momenta: SIGMAPX and SIGMAPY are beta * gamma ~ 1.9e-2 while the ion you define with kinetic energy of 60 keV would have beta * gamma ~ 0.001135
Reducing SIGMAPX and SIGMAPY and rerunning your file does give the expected result.
OPAL> * ************** B U N C H *********************************************************
best, Chris
On Wed, Apr 6, 2022 at 5:35 AM Van de Walle Jarno <jarno.van.de.walle AT sckcen.be> wrote:
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[Opal] beamline simulation for low energy radioactive ion beams,
Van de Walle Jarno, 04/05/2022
-
Re: [Opal] beamline simulation for low energy radioactive ion beams,
Adelmann Andreas (PSI), 04/06/2022
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RE: [Opal] beamline simulation for low energy radioactive ion beams,
Van de Walle Jarno, 04/06/2022
-
Re: [Opal] beamline simulation for low energy radioactive ion beams,
Chris Hall, 04/06/2022
- RE: [Opal] beamline simulation for low energy radioactive ion beams, Van de Walle Jarno, 04/07/2022
-
Re: [Opal] beamline simulation for low energy radioactive ion beams,
Chris Hall, 04/06/2022
-
RE: [Opal] beamline simulation for low energy radioactive ion beams,
Van de Walle Jarno, 04/06/2022
-
Re: [Opal] beamline simulation for low energy radioactive ion beams,
Adelmann Andreas (PSI), 04/06/2022
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