Re: particle distribution after the collimator

From: Ercan Pilicer <>
Date: Wed, 11 Nov 2009 12:01:57 +0100

dear Vitaly

it is not clear for me if you compiled fluka with your modified routine?

another thing is to get distribution of particles going in/out from a
user selected boundary you can use USRBDX card and utilize FLAIR


On Wed, Nov 11, 2009 at 11:08 AM, Gostishchev, Vitaliy Dr.
<> wrote:
> Dear FLUKA experts,
> Recently I asked the FLUKA community about the way to obtain the particle
> distribution after the collimators.
> ...I would kindly ask you to help me in solution of one problem. We are
> going to calculate the passage of the particles through the graphite
> collimators in details. This means that we want to know the change of
> original particle distribution including particles going directly through
> the graphite. There is a certain particle distribution before the
> collimator. Then the particles pass mostly through the collimator slit but
> part of them pass directly through the collimator material. Graphite is not
> so effective as iron in sense of particle cutting. The radiation length for
> graphite is about 30 cm only. Therefore, we need longer collimators but,
> unfortunately, we have not enough space for them. We are interested in
> particles which can come to the transfer beam acceptance together with
> antiprotons, for example, pions. Pions have similar rigidity in our case and
> theoretically can be transport to the ring and make some harm there. Could
> you recommend some proper way to obtain such a particle distribution after
> collimator. Do we need some additional code?  The idea is to have a particle
> distribution before and after collimator in order to understand how many
> particles can come to the septum magnet of the following storage ring. It
> gives us an information about possible problems...
> There were several useful recommendations but, unfortunately, I didn't solve
> the problem up to now. I tried to use the MGDRAW subroutine and wrote some
> lines in mgdraw.f (namely, in entry BXDRAW). I'm not sure that this is
> correct and the best variant. In addition, maybe something wrong with my
> input file. Nevertheless, there are some errors occurred during compilation.
> Maybe I'm using the CALL GEOR2N in wrong way because there are some errors
> due to different type of variables. I didn't understand how it really works.
> I appreciate any help. Thank you in advance.
> Best regards,
> Vitaliy Gostishchev
> p.s. In the attachment you can find my input and the modified MGDRAW.F
> files. <<distribv1.inp>> <<mgdraw.f>>
Received on Wed Nov 11 2009 - 13:03:57 CET

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