Re: Fw: fluka

From: Alberto Fasso' (fasso@SLAC.Stanford.EDU)
Date: Wed Oct 29 2003 - 19:22:15 CET

  • Next message: John Clem: "Re: Fw: fluka"

    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 FassÚ
    > > 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 FassÚ
    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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