From: John Clem (clem@mail2.bartol.udel.edu)
Date: Wed Oct 29 2003 - 22:03:21 CET
Actually there is transport in the vacuum initially, however taking your
idea further by placing an intermediate thin low density region between
air-vacuum boundary would probably work...
Thanks,
John
On Wed, 29 Oct 2003, Alberto Fasso' wrote:
> Hi John,
>
> if there is no transport at all in vacuum, you can just replace it by
> any dummy material you wish, and do the reflection at the surface
> boundary air-dummy_material.
> It sounds funny, but you can use even lead for this purpose.
> But maybe you could find less shocking to define a thin layer of
> air with a different material name.
>
> Alberto
>
>
> On Wed, 29 Oct 2003, John Clem wrote:
>
> >
> > Hi Alberto,
> >
> > Thanks... Yes, I'm very familiar with USRMED from past work. I didn't
> > realize it could be used in that way. One particular problem I'm
> > interested in requires a 180 reflection at an air-vacuum boundary i.e.
> > track departing an air region into a vacuum region is reflected back
> > into the air region. In this case, it's not clear if the rotation
> > occurs in air or the vacuum.
> >
> > John
> >
> >
> >
> > On Wed, 29 Oct 2003, Alberto Fasso' wrote:
> >
> > > I am not sure about MGDRAW, but I think it could be dangerous.
> > > The proper way to modify the directional cosines of a particle
> > > is by means of another user routine, USRMED (see details in
> > > Chap. 19 of the Manual). It is activated by option MAT-PROP with
> > > SDUM = USERDIRE. It can be used, for instance, to
> > > implement some sort of albedo reflection at the surface of
> > > a given medium. However, it cannot be used in vacuum.
> > >
> > > Sorry if this does not answer your question directly.
> > >
> > > Alberto
> > >
> > > On Fri, 24 Oct 2003, John Clem wrote:
> > >
> > > > Does anyone know the answer to this ?? Obviously, this can be tested, but
> > > > there may be some subtle effects.
> > > >
> > > > Thanks,
> > > > John
> > > >
> > > > ----- Original Message -----
> > > > From: John Clem
> > > > To: Alfredo.Ferrari@cern.ch
> > > > Sent: Thursday, October 23, 2003 9:06 AM
> > > > Subject: fluka
> > > >
> > > >
> > > >
> > > > Alfredo,
> > > >
> > > > Can the directional cosines of a particle trajectory be modified in MGDRAW ??
> > > >
> > > > Thanks,
> > > > John
> > > >
> > > >
> > > > >>
> > > > >>John Clem
> > > > >>Senior Scientist
> > > > >>217 Sharp Lab
> > > > >>Bartol Research Institute
> > > > >>University of Delaware
> > > > >>Newark, DE 19716 USA
> > > > >>Tel 302-831-4354
> > > > >>Fax 302-831-1843
> > > > >>clem@bartol.udel.edu
> > > > >>
> > > >
> > >
> > > --
> > > Alberto Fassò
> > > SLAC-RP, P.O. Box 4349, MS 48, Stanford CA 94309
> > > Phone: (1 650) 926 4762 Fax: (1 650) 926 3569
> > > fasso@slac.stanford.edu
> > >
> >
> >
>
> --
> Alberto Fassò
> SLAC-RP, P.O. Box 4349, MS 48, Stanford CA 94309
> Phone: (1 650) 926 4762 Fax: (1 650) 926 3569
> fasso@slac.stanford.edu
>
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