FW: Muli-beams problems in FLUKA

From: Vasilis Vlachoudis <Vasilis.Vlachoudis_at_cern.ch>
Date: Tue, 22 Mar 2011 08:54:16 +0000

Hi Soheil,
(these questions should be addressed to the FLUKA mailing list and not individually,
so I am CCing the list)

in FLUKA you can only define one beam at at time. So if you put two BEAM cards
(or any other beam related card like BEAMPOS etc..) the last ones will override
the settings of the previous.

Therefore I see two solutions to your problem
1. Create two runs with each one defining one beam. Run exactly the same
number of particles and cycles, and in the end merge both results together.
However you have to be extremely careful on the normalization, since the
results will be per primary particle. Each primary particle will be 50% from
one source and 50% from the other.
2. Create a custom source.f routine, where you do whatever logic you like


From: soheil khoshbinfar [skhoshbinfar_at_gmail.com]
Sent: 22 March 2011 09:10
To: Vasilis Vlachoudis
Subject: Muli-beams problems in FLUKA

Dear Mr. vlachoudis,
I am new in FLUKA code. i tried several times to define my mutliple
beam sources irridiating on a simple target. What i did was a
definition of two beam sources at specified positions and their
correspondance properties. Since the code run for 5 cycle, in USRBIN
card, just one source transport is shown not two of them! how can i
resolve this issue?

many thanks
Received on Tue Mar 22 2011 - 13:45:47 CET

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