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[Opal] ECOLLIMATOR -- questions/potential issue

From: Dragos Constantin <Dragos.Constantin AT varian.com>
To: "opal AT lists.psi.ch" <opal AT lists.psi.ch>
Subject: [Opal] ECOLLIMATOR -- questions/potential issue
Date: Sat, 12 Sep 2020 17:16:47 +0000
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Hi All,

I have defined an ECOLLIMATOR like this:

BCOL: ECOLLIMATOR, L = 1, Z =0, X = 0, Y = 0, XSIZE = 0.002, YSIZE = 0.002, OUTFN = "BCOL";

so I have a circular aperture of 2mm radius. During the simulation the reference particle deviates from the central axis because of fields asymmetries.

Is it possible that the circular aperture is defined with respect to the reference particle local reference frame instead of the laboratory reference frame?

It looks like the particles are no longer tracked if they are more than 2mm distance from the reference particle. I have attached two pictures that show the macroparticles bunch and the collimator wall from 2 different orrientations. On the 'cross section' view you can clearly see the circular aperture acting on the bunch but its position is obviously displaced to the right.

Thanks,

Dragos

Attachment: aperture_1.png
Description: aperture_1.png

Attachment: aperture_2.png
Description: aperture_2.png

[Opal] ECOLLIMATOR -- questions/potential issue, Dragos Constantin, 09/12/2020
- Re: [Opal] ECOLLIMATOR -- questions/potential issue, Adelmann Andreas (PSI), 09/15/2020
  - RE: [Opal] ECOLLIMATOR -- questions/potential issue, Dragos Constantin, 09/16/2020
    - Re: [Opal] ECOLLIMATOR -- questions/potential issue, Dr. Simon Friederich, 09/16/2020
    - Re: [Opal] ECOLLIMATOR -- questions/potential issue, Christof Metzger-Kraus, 09/16/2020