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Forum: Space Applications
Re: Question Non-Ionizing energy loss (NIEL) (aimsphere)
Date: 11 Feb, 2016
From: Hugh Evans <Hugh Evans>

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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