Re: [fluka-discuss]: Recombination of electron and ion pairs in ionizing chamber

From: Jean-Emmanuel Groetz <jegroetz_at_univ-fcomte.fr>
Date: Mon, 30 Mar 2015 15:36:48 +0200

Dear Bo Yang,

In addition to Paolo and Alberto responses, the recombination of
electron and ion pairs in IC can be assessed through the ion collection
efficiency with the Boag's two voltage method.
You can find more information in:
      * S. Lang, J. Hrbacek, A. Leong, and S. Klöck, Phys. Med. Biol.
        57, 2819(2012).
      * J. Havercroft and S. Klevenhagen, Phys. Med. Biol. 38, 25
        (1993).
      * J. Burns and D. Burns, Phys. Med. Biol. 38, 1986 (1993).

If you want to know the distribution of electric field lines in your IC,
you need a software based on finite element method to reproduce the
exact geometry and to calculate the electric field.
Correction factors for a small IC have been established using Fluka &
Penelope MC codes and the Comsol FEM software in a recent work (Review
of Scientific Instruments 85, 083304 (2014) or
http://dx.doi.org/10.1063/1.4890817)

Jean-Emmanuel

-- 
_______________________________________________
Jean-Emmanuel Groetz
Laboratoire Chrono-Environnement UMR CNRS 6249
Université de Franche-Comté
16 route de Gray
25030 Besançon Cedex
France
mailto : jegroetz_at_univ-fcomte.fr
tel : +33 (0) 3 81 66 65 07
fax : +33 (0) 3 81 66 65 22
http://chrono-environnement.univ-fcomte.fr/spip.php?article1537
_______________________________________________
> Dear Bo Yang,
> FLUKA is not able to simulate directly the recombination process.
> However,   recombination can be taken into account applying a
> correction to the deposited energy. By activating the TCQUENCH card,
> energy depositions are corrected  as a function of dE/dx according to
> the Birks formula. The user must provide Birks parameters relevant for
> the specific medium and electric field.
> Paola
> 
> -----Original Message-----
> From: owner-fluka-discuss_at_mi.infn.it [mailto:owner-fluka-discuss_at_mi.infn.it] On Behalf Of Alberto Fasso
> Sent: domenica 29 marzo 2015 16:40
> To: fluka-discuss_at_fluka.org
> Cc: 杨博
> Subject: RE: [fluka-discuss]: Recombination of electron and ion pairs
> in ionizing chamber
> 
> Dear Bo Yang,
> 
> FLUKA cannot simulate recombination of electron and ions pairs in
> ionizing chambers. However, it is possible to make a correction to the
> energy deposited, as you can see in the attached Note. See in
> particular Sec. 5
> 
> Alberto
> ________________________________________
> From: owner-fluka-discuss_at_mi.infn.it [owner-fluka-discuss_at_mi.infn.it]
> on behalf of 杨博 [b-yang12_at_mails.tsinghua.edu.cn]
> Sent: 29 March 2015 06:17
> To: fluka-discuss_at_fluka.org
> Subject: [fluka-discuss]: Recombination of electron and ion pairs in
> ionizing chamber
> 
> Dear Fluka users,
> 
>    I would like to evaluate the effects of recombination of electron
> and ions pairs in ionizing chamber generated by photon with the
> utrashort time scale of ps (1.0E-9s).I try to use FLUKA to smiulate
> this process,but encounter some questions as followed.
> 
>      (1) I don't know if Fluka could provide a static electric field
> as that in ionizing chamber.If not, Is there any other simulation code
> suggested ?
> 
>      (2) I doubt that if FLuka could simulate the process of
> recombination of electron and ions pairs,Beacause I want to evaluate
> the underestimation due to recombination of electron and ions pairs in
> ionizing chamber .
> 
>   I know these requirements might be beyond the capabilites of FLUKA.I
> just want to some suggestions from everyone so that I could solve
> above questions. Any help will be really appreciated. Thanks in
> advance.
> 
> 
> 
> BO YANG
> 
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Received on Mon Mar 30 2015 - 17:12:44 CEST