Phase-space coordinates scoring

[enrico.nic (Enrico Nichelatti)]

Dear FLUKA experts,

For a propagating proton beam, I would like to record the position and slope of each particle crossing a plane in a file. The purpose is to obtain a sampling of the phase-space beam ellipse. From my search of the manual, I understand that using a collision tape might be the way to do this. Can you please confirm or clarify this, and let me know if there is a tutorial available to guide me through the process?

Thank you in advance for your help.
Kind regards, Enrico

[horvathd (Dávid Horváth)]

Dear Enrico,

You can achieve this with the mgdraw.f user routine, using the BXDRAW entry. This code is run each time a particle crosses a region boundary. Here, you can filter out the crossings you are interested in (location, particle type, energy, etc.) and write the crossing coordinates, direction, particle type, energy, etc., into a file.

You can find an example here:

Direction of incoming particles

Dear Yasser, You should be able to see the tracks from Flair. I tell you the steps: 1 - Go to the Geometry tab. 2 - On your left you will see the subtabs (Geometry, layers, errors) Go to layers and select one of them ( e.g. Media) 3 - Press → Userdump 4 - Below, you will see the Userdump window. From there you can choose the file that you obtained and select the events and particles that you want to see. #Comment: ‘Start’ means the event from where you want to see your tracks, and ‘# even…

You may want to look at the source_newgen.f routine to see the format used there for phase-space sampling.

Cheers,
David

[enrico.nic (Enrico Nichelatti)]

Dear David,

Thank you so much for your consistently detailed and helpful replies!

Have a great day,
Enrico