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[Opal] beamline simulation for low energy radioactive ion beams

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  • From: Van de Walle Jarno < AT>
  • To: "opal AT" <opal AT>
  • Subject: [Opal] beamline simulation for low energy radioactive ion beams
  • Date: Tue, 5 Apr 2022 13:52:39 +0000
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I’m new to OPAL and I’m trying to simulate a beamline for radioactive ions, which I did in MAD-X, now in OPAL.

The properties of the beam are:

Mass = 100 (amu)

Energy = 60 keV (!)

The beamline consists of 4 quad doublets and 1 dipole (112 degrees).

In MAD-X this runs smoothly and I wanted to check first of all if I can get similar results with OPAL. The next step would be to include a real 3D magnetic field map for the dipole in OPAL (which is not possible in MAD-X).


The first results are not encouraging L

I encounter multiple issues – which are probably related to a misinterpretation of the input file needs …


- when including the dipole, the tracking takes way too long to be realistic (so somewhere the tracking blocks)

- If I exclude the dipole (like in the attached inputfile), I see that The Kinetic energy of the beam is suddenly 4.528 GeV with dE = 19.686 MeV ?! No idea why …


I’m in any case convinced that OPAL could help us further in the simulation of our Radioactive Ion Beam beamlines and in the future our 100 MeV proton accelerator.

May I ask you to run the attached input file and/or hint towards my (obvious, maybe J) mistakes ?


Any help is highly appreciated !

Many thanks in advance and kind regards





Jarno Van de Walle, PhD
Beam physicist

+32 14 33 84 16 ǀ +32 470 20 98 31




Belgian Nuclear Research Centre

Boeretang 200 - 2400 Mol – Belgium





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