Re: Can the fluka calculate the time spread for outgoing neutron

Hi Hantao,

1) You can either compile each routine with fff and then create the
   executable with

   $FLUPRO/flutil/lfluka -o myfluka -m fluka source.o mgdraw.o

   or do everything with lfluka

   $FLUPRO/flutil/lfluka -o myfluka -m fluka source.f mgdraw.f

2) mgdraw is suitable for your problem but should always be used with
   care. Follow the suggestions given by Anna but debug your routine
   with print-outs from a few events, i.e. make sure that the
   information corresponds to what you expect.

Cheers
Stefan

On Mon, 13 Oct 2008 jinght_at_mail.ihep.ac.cn wrote:

> Dear Mr. Ferrari,
> 1) Some examples to write, compile and link a user routine are just one
> user routine, for example,
> $FLUPRO/flutil/fff yyy.f
> $FLUPRO/flutil/lfluka -o myfluka -m fluka yyy.o,
> When I have been ready for source.f and mgdraw.f, how to compile them
> at the same time and obtain the new executable? namely, more than one user
> routines been used and how to compile and link them?
>
> 2) When I read the report of "The FLUKA User Routines", At the last sheet,
> it said
> "When mgdraw should better not be used when biasing is requested
> Whenever low-energy neutrons (E<20 MeV) are used, unless one has a deep
> knowledge
> of the peculiarities of their transport (iekerma, etc)
> (or at least one has to be a very experienced user to manage these
> cases without making mistakes...)".
> I need to consider the time-spread(neutron pulse width) of low-energy
> neutrons,
> I don't know the mgdraw.f is still suit for my problem. if not, how shall
> I do?
> Thank you very much.
>
> >flux
> >MIME-Version: 1.0
> >Content-Type: TEXT/PLAIN; charset=ISO-8859-1
> >Content-Transfer-Encoding: QUOTED-PRINTABLE
> >Sender: owner-fluka-discuss_at_mi.infn.it
> >
> >
> > Hi Hantao,
> > sure that FLUKA can do this.
> > If you want to study the problem, I think you have to follow two steps:
> >
> > - build your proton source through the user routine source.f, which you
> > call via the SOURCE card. In the include file (FLKSTK) you find
> > the stack of the primaries: the Agestk variable is the age of the
> > particle, in seconds. You can add the spread due to your proton pulse
> > width.
> >
> > - store the temporal information of the outcoming neutrons (for ex. in
> > a ntuple with all the informations you need...).
> > To do this I would suggest to use the mgdraw.f routine, which is
> > activated by the card USERDUMP with what(1) >=3D 100. There you can
> look
> > for neutrons, for example at the boundary crossing (subroutine
> > BXDRAW) between your moderator and the medium where you put it
> > (i.e. air or vacuum); in the include (TRACKR) you find the variable
> > Atrack, which is the age of the particle, always in seconds.
> >
> > cheers,
> >
> > Anna
> >
> >
> >
> >
> >On Fri, 26 Sep 2008, jinghantao wrote:
> >
> >> Hello everyone, I want to use a pulse proton source to bombard heavy
> >> nucleus target(eg. Ta, W etc.) to obtain neutron flux. Now, comparing
> with
> >> proton pulse width, I need to evaluate time spread for neutron flux
> which
> >> come out from moderator(eg. water).
> >> Can the fluka do such things? How to do it ? Thanks!
> >> Jing Hantao
> >>
> >
>
>

-- 
___________________________________
Stefan Roesler
CERN, SC/RP
CH-1211 Geneva 23
Switzerland
Phone:  +41-22-7679891
Fax:    +41-22-7669639
E-mail: Stefan.Roesler_at_cern.ch