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SR-NIEL – 7

Screened Relativistic (SR) Treatment for NIEL Dose

Nuclear and Electronic Stopping Power Calculator

(version 10.14)

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NIEL Dose Calculator Protons & Ions spectral fluence

Incident Particle:
Proton and Ion Model:
Hadronic Contribution:
Target Materials
Target Selection:
N° Elements:
Target Material Z Stoichiometric Index or Element Fraction Displacement Threshold Energy [eV] *
Spectral Fluence
values:
use dot "." as decimal separator;
at least, a pair (energy and spectral fluence) of values are required
Energy
[MeV]		Spectral Fluence
[cm-2 MeV-1]


EXAMPLE:
Copy and paste the data here to reproduce the following example.
Protons NIEL in Si (red) and protons spectral fluence (blue) assuming an orbit around Jupiter, at Europa altitude, during 1 year mission:

Spectral fluence data are calculated with JOREM Model implemented in SPENVIS
assuming a 4π solid angle exposure.

NOTE:
  • *Experimentally determined Ed values:
    1. Ga: 21.5 eV, As: 21.5 eV as reported in [Campesato et al. (2019)] from proton, electron and neutron irradiations of solar cells. In Triple Junction solar cells, in which the dominat damage mechanism is that one due to the GaAs middle junction, a commonly effective value of Ed was 24 eV [Campesato et al. (2018), Campesato et al. (2019)].
    2. Ge: 40.5 eV as reported in [Campesato et al. (2019)].
    3. In: 43 eV, Ga: 21 eV, P: 21 eV as reported in [Campesato et al. (2018)] for In0.49Ga0.51P single junction solar cells irradiated with electrons and protons. In [Campesato et al. (2019)] with electron, proton and neutron irradiation, it was shown that a commonly effective value of Ed=38 eV can be employed in an equivalent way.
  • In the present NIEL calculators, for protons up to 1 GeV and alpha-particles up to 1 GeV/nucleon impinging on elements with atomic number from Z=4 up to Z=51 , the hadronic contributions were interpolated or extrapolated from those obtained from [Jun et al. (2003, 2004), Jun (2017)] regarding 10 absobers (i.e., C, Al, Si, P, Ga, Ge, As, In, Cu, Se). For silicon absorbers, in addition, the hadronic contribution for energies from 1 up to 24 GeV was obtatined from [Huhtinen (2002)].
  • As default option (no scaling), no Ed dependence is included for the hadronic contribution to NIEL. It has to be remarked that such a behaviour is consistent with the results obtained for neutron damage functions with MeV neutrons (up to 20 MeV) by means of NJOY-2012 code (e.g. see NJOY based neutron NIEL calculator). As alternative option (linearly scaled), the hadronic contribution are linearly varied with respect to the calculated by the same amount found for Coulomb contributions.
  • NIEL for compounds can be determined by means of Bragg's rule, i.e., the overall NIEL in units of MeV cm2/g is obtained as a weighted sum in which each material contributes proportionally to the fraction of its atomic weight. An example for selection, with GaInP2 as target, follows:

    or equivalently

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