Dear Valerio,
For Flair-related questions please always send the flair file, otherwise one cannot reproduce the problem (for example, one cannot know which angles you simulated). Anyway, looking at your FLUKA input file, it seems that changing the angle for the plane Pl1 does not have the effect you are looking for: at the position of the beam (at y=-0.5cm and z=-2.5cm, with the beam pointing in x direction) the thickness of the wheel remains the same for all angles, and therefore you don't have a spread-out Bragg peak (note, the beam still traverses the wheel and hence the Bragg peak has a different position than if the wheel would not be present). You should carefully check your geometry implementation and verify for each angle that the thickness indeed changes.
Cheers, Anton
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From: owner-fluka-discuss_at_mi.infn.it [owner-fluka-discuss_at_mi.infn.it] on behalf of Valerio Santoro [valerio.santoro_at_studio.unibo.it]
Sent: 07 December 2017 14:47
To: fluka-discuss_at_fluka.org
Subject: [fluka-discuss]: I: Modulator wheel
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Da: Valerio Santoro
Inviato: giovedì 7 dicembre 2017 12:40
A: owner-fluka-discuss_at_mi.infn.it
Oggetto: Modulator wheel
Hi dear Fluka users,
Good morning, I am trying to simulate a modulator wheel in a simple problem with a pencil proton beam impinging on a water cylinder target. I tried to build the wheel as in the example of a previous conversation about this topic, I used the loop function over the angle defined through the card #define creating six simulations where just the angle changes. I also add the rule +\I-\d\d\d\d_fort.\U to each of the six simulations, but when I plot the results I obtain the same as for a single beam without the loop function and without the wheel. Should I see wider Bragg peak, extended over a larger area? I attach here the plots and the input files. Thank you again for the help!
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Received on Sun Dec 10 2017 - 23:42:34 CET