Re: transport cut-offs in selected regions

From: John Clem <>
Date: Sat, 28 Aug 2010 11:16:46 -0400

Hi Giuseppe, the primary objective is cpu time reduction for the run..
It is my understanding, a particle assigned no weight (WEE=0) will
continue to be tracked irregardless and subject to all physical
mechanisms that were set in the input controls. I assume it is not
possible to set Eksco=0 in usrmed.f ??

Thanks, John

G. Battistoni wrote:
> Hi John
> the way to accomplish your task is to make use of the "usrmed.f" user
> routine.
> You activate the call to usrmed by means of the command MAT-PROP with
> SDUM=USERDIRE for a series of different selected materials (see the manual for
> essential details).
> Now, if you look at usrmed.f you see that you have available the
> following variables:
> * ij = particle id
> * Eksco = particle kinetic energy (GeV)
> * Pla = particle momentum (GeV/c)
> * Wee = particle weight
> * Mreg = (original) region number
> * Newreg = (final) region number
> Therefore you can set up a logic so check Eksco for a given particle
> when it is within region Newreg (usrmed will be called at each step, but
> you can also
> implement a logic at the passage from Mreg to Newreg, if this helps you).
> As soon as you want to cut it out below a given
> threshold, you must simply set (in the same routine)
> In summary, by means of MAT-PROP and usrmed.f
> you can exploit a check as a function of both materials and regions.
> Giuseppe
> John Clem wrote:
>> Hi All,
>> As we know the "EMFCUT" command allows the option to set the electron
>> and photon energy transport cut-offs in selected regions. This identical
>> option for hadrons and muons would also be very useful in some
>> applications, however it is my understanding the "PART-THRes" command is
>> not region dependent. Is there a means to set the energy transport
>> cutoff for muons and hadrons for selective regions (or materials)?
>> Thanks, John Clem

 >>John Clem
 >>Research Associate Professor
 >>Bartol Research Institute
 >>Department of Physics and Astronomy
 >>University of Delaware
 >>Newark, DE 19716
 >>off 302-831-4354
 >>cell 302-388-1218
Received on Sat Aug 28 2010 - 19:02:54 CEST

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