Re: Re: [fluka-discuss]: How to kill secondary electrons?

From: Vittorio Boccone <dr.vittorio.boccone_at_ieee.org>
Date: Mon, 10 Feb 2014 17:08:59 +0100

Dear Chen Yuan,
 you don't need to kill them. In case they are generated they won't
be transported because their energy is too low they will be just killed in
place and their energy deposited in spot. The notion "secondary electron"
that you use is just functional to some fields of application.

What really matters is their energy at generation which defines how they
loose it travelling in the media. Note: the present lowest transport limit
for electrons is 1 keV, so you will never have 50 eV electrons going around.

Best,
V.


On Mon, Feb 10, 2014 at 2:56 AM, <yyc2011_at_mail.ustc.edu.cn> wrote:

> Dear Andrea,
>
> Thanks for your reply.
> However,you know secondary electrons energy is 0~50 eV.In the Fluka,the
> present lowest transport limit for electrons is 1 KeV.Meanwhile,Default:
> the e+e- transport cutoff is set equal to the production threshold for
> discrete electron interactions.In other words,the production threshold for
> electrons is 1 KeV,which is larger than secondary electrons energy.In this
> case,Could I kill secondary electrons?
>
> Best Regards
> Chen Yuan
>
>
> > -----Original E-mail-----
> > From: Andrea.Mairani_at_mi.infn.it
> > Sent Time: 2014-1-26 19:49:12
> > To: yyc2011_at_mail.ustc.edu.cn
> > Cc: fluka-discuss_at_fluka.org
> > Subject: Re: [fluka-discuss]: How to kill secondary electrons?
> >
> > Dear Chen,
> > as already mentioned by Vasilis in his previous post:
> > "You can only play with the thresholds EMFCUT to kill secondary
> electrons"
> > For example:
> > EMF card for SDUM = PROD-CUT
> > |WHAT(1)| = energy threshold for electron and positron PRODUCTION in GeV:
> > > 0.0 : energy threshold for electron and positron
> production is
> > expressed as total energy (kinetic plus rest mass)
> > < 0.0 : energy threshold for electron and positron
> production is
> > expressed as kinetic energy
> >
> > EMF card for For SDUM = blank
> > |WHAT(1)| = electron and positron TRANSPORT energy cutoff in GeV.
> > WHAT(1) > 0.0 : electron and positron cutoff is expressed as total
> > energy (kinetic plus rest mass)
> > < 0.0 : electron and positron transport cutoff is expressed
> as
> > kinetic energy
> > = 0.0 : ignored
> > This value can be overridden in user routine UBSSET by
> assigning
> > a value to variable ELECUT.
> > Default: the e+e- transport cutoff is set equal to the
> > production
> > threshold for discrete electron interactions
> >
> >
> > Please read carefully the explanation of the EMF card
> > http://www.fluka.org/fluka.php?id=man_onl&sub=27 and the related
> examples.
> >
> > Best Regards,
> > Andrea
> >
> >
> >
> >
> > > Dear Fluka users,
> > >
> > > If I want to kill secondary electrons,what should I do? Could you
> tell
> > > me in detail or could you give me a simple example?
> > > Thanks for any suggestion.
> > >
> > > Best Regards
> > > Chen Yuan
> > >
> > >
> > >
> > >
> > >
> > >> -----Original E-mail-----
> > >> From: "Vasilis Vlachoudis" <Vasilis.Vlachoudis_at_cern.ch>
> > >> Sent Time: 2014-1-10 22:48:21
> > >> To: "yyc2011_at_mail.ustc.edu.cn" <yyc2011_at_mail.ustc.edu.cn>,
> > >> "fluka-discuss_at_fluka.org" <fluka-discuss_at_fluka.org>
> > >> Cc:
> > >> Subject: RE: [fluka-discuss]: Exchange the lower bound of the region
> > >> with the upper bound of the region in EMFCUT
> > >>
> > >> Hi Chen,
> > >>
> > >> No you cannot exchange the upper/lower bound the order should be the
> > >> same as they appear in the input file.
> > >> Always verify in the output <inputname>001.out that the thresholds
> > >> understood by the code are the ones you wanted.
> > >> Concerning your other emails. Use USRBIN with binary output and to be
> > >> able to process the file and plot the results.
> > >> You can only play with the thresholds EMFCUT to kill secondary
> electrons
> > >>
> > >> Look the flair tutorial http://www.fluka.org/flair/flair_basic1.pdf
> > >> and the course slides especially the one on scoring
> > >>
> https://www.fluka.org/free_download/course/dresden2013/Lectures/07_Scoring_1013.pdf
> > >>
> > >> Vasilis
> > >>
> > >>
> > >> ________________________________________
> > >> From: owner-fluka-discuss_at_mi.infn.it [owner-fluka-discuss_at_mi.infn.it]
> on
> > >> behalf of yyc2011_at_mail.ustc.edu.cn [yyc2011_at_mail.ustc.edu.cn]
> > >> Sent: 08 January 2014 03:40
> > >> To: fluka-discuss_at_fluka.org
> > >> Subject: [fluka-discuss]: Exchange the lower bound of the region with
> > >> the upper bound of the region in EMFCUT
> > >>
> > >> Dear everyone,
> > >>
> > >> When I use EMFCUT command to set electron transport energy
> cutoff,Can
> > >> I exchange the lower bound of the region with the upper bound of the
> > >> region in EMFCUT?The attachment is my input file.The EMFCUT is set as
> > >> follows.
> > >> EMFCUT -0.00001 0.000001 VOID left
> > >> When I exchange the lower bound of the region with the upper bound of
> > >> the region,the EMFCUT is set as follows.
> > >> EMFCUT -0.00001 0.000001 left VOID
> > >> I find the result becomes quite different.For this result,I can't
> > >> understand.
> > >> So,
> > >> (1)Could I exchange the lower bound of the region with the upper bound
> > >> of the region in EMFCUT?And Why?
> > >> (2)Could you give me a simple schematic plot to explain which is the
> the
> > >> lower bound of the region and which is the upper bound of the region?
> > >>
> > >> Best Regards
> > >> Chen Yuan
> > >>
> > >>
> > >>
> > >
> >
> >
>
>
Received on Mon Feb 10 2014 - 19:43:43 CET

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