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Forum: Space Applications
Re: Question Non-Ionizing energy loss (NIEL) (aimsphere)
Re: None Re: Non-Ionizing energy loss (NIEL) (Hugh Evans)
Date: 28 Mar, 2016
From: xue <xue>

HI,friend ,i also do the same work with you .But I used Geant4.And I want to using mulassis,but i cannot find the software (Mulassis),bacause its (http://reat.space.qinetiq.com/mulassis/)can not open.Can you tell me ,how to downland the software?On Thu, 11 Feb 2016 08:26:16 GMT, Hugh Evans wrote:
> On Fri, 05 Feb 2016 13:34:07 GMT, aimsphere wrote:
> 
> > Hello G4 developers and users,
> > 
> > I would like to estimate displacement damage (DD) in a silicon detector
> > in space. I understand that it is calculated as a product of the
> > Non-Ionizing energy loss (NIEL) and the particle fluence. My question
> > here is about NIEL calculation.
> 
> In Mulassis and GRAS we tend to use a method that involves the folding
> of the shielded environment spectrum with the NIEL curve. This produces
> the TNID (Total Non-Ionising Dose) at the surface between two volumes.
> As most TNID effects are manifested in optical components (solar cells,
> opto-couplers, etc) the sensitive volume is usually very thin (unlike
> for human effects) and this approximation works very well.
> 
> So, to achieve this, we calculate the fluence of particles crossing the
> surface, weighting the particles by 1/cosine of the angle of incidence.
> This shielded fluence spectrum is then folded with the relevant NIEL
> curve.
> 
> > 
> > I found that there is a method called GetNonIonizingEnergyDeposit()
> > which can be accessed from the G4step class. Is this method appropriate
> > to estimate NIEL and thus the DD dose? Has anyone tried it?
> 
> Laurent Desorgher did implement such a method in Gras, which is in the v3.4 release:
>     /gras/analysis/nid 
> 
> Regards, Hugh
> 

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