The OPAL Discussion Forum

[Christof Metzger-Kraus <christof.j.kraus AT gmail.com>]

Hi Simon,

the problem could be either the name for the element ('collimator') or the dimensions of the collimator (0.1 / 0.1). It works fine for me with the attached input file.

Cheers,

Christof

On Thu, Aug 6, 2020 at 9:11 AM Simon Friederich <sifriede AT uni-mainz.de> wrote:

Dear OPAL-Team,

I wanted to use a collimator in my beamline. Unfortunately it does not affect the beam in any way.

Please have a look at my small "collimator.in" file:
The beamline consists of a cathode, monitor, collimator, monitor. As the collimator does not work (yet), I've placed a DRIFT element with  a tiny aperture in the beam line, which does work as a collimator

(Picture shows two monitors: left: the starting flattop beam distribution, right: the beam profile collimated by the tiny-aperture-drift space

)

But in the end I need a rectangle-shaped collimator which I wanted to achieve using a FLEXIBLECOLLIMATOR + DESCRIPTION = "intersection(rectangle(0.03,0.03), translate(rectangle(0.015, 0.015), 0, -0.015)".

Do I have to "activate" the collimator mechanism somehow in opal-t?

Best regards and thanks in advance
Simon

-- 
-----------------------------------
Dr. Simon Friederich
Helmholtz-Institut Mainz
Kollaboration B/ACID
Johannes Gutenberg-Universität Mainz
Staudingerweg 18
55128 Mainz, Deutschland

Tel.: +49 (0)6131 39-23160
E-Mail: sifriede AT uni-mainz.de
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Attachment: collimator.in
Description: Binary data

Attachment: collimator.png
Description: PNG image