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Atomistic Simulations of Displacement Cascades in Fused Silica: It is Compared with Different Concentration of H in the Bulk

Published online by Cambridge University Press:  26 February 2011

Fernando Mota ,
Maria Jose Caturla ,
Jose Manuel Perlado ,
Angel Ibarra  and
Joaquin Molla
Fernando Mota
Affiliation:
[email protected], Universidad Politecnica de Madrid, E.T.S.I.I, Instituto de Fusión Nuclear, C/ Jose Gutierrez Abascal nº 2, Madrid, 28006, Spain, 913363108, 913363002
Maria Jose Caturla
Affiliation:
[email protected], Universidad de Alicante, Fisica Aplicada, Alicante, 03690, Spain
Jose Manuel Perlado
Affiliation:
[email protected], Universidad Politécnica de Madrid. E.T.S.I.I., Instituto de Fusión Nuclear, C/José Gutierrez Abascal nº 2, Madrid, 28006, Spain
Angel Ibarra
Affiliation:
[email protected], CIEMAT, Materiales para Fusion, Avda/ Complutense nº 22, Madrid, 28040, Spain
Joaquin Molla
Affiliation:
[email protected], CIEMAT, Materiales para Fusion, Avda/ Complutense nº 22, Madrid, 28040, Spain
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Abstract

Amorphous Silica is one of candidate materials for both final focusing optics of lasers for NIF and future inertial fusion reactors and diagnostics of the Safety and Control Systems of the ITER machine as well as DEMO magnetic fusion reactors. In operation, these materials will be exposed to high neutron irradiation fluxes and it can result in point defect and vary the optical absorption, that is, degradation of the optical properties. In this paper we present molecular dynamic simulation of displacement cascade due to energetic recoils in amorphous silica without hydrogen atoms and with 1% of hydrogen atoms trying to identify defects formation. We have made a statistics of the different kind of defects at different energy of primary knock-on atoms (PKA). The range of studied PKA energies are from 400 eV to 3.5 keV and it is made to both component of this material Silicon and Oxygen.

Keywords

neutron irradiationsimulationamorphous
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 981: Symposium JJ – Structural and Refractory Materials for Fusion and Fission Technologies , 2006 , 0981-JJ07-05
Copyright
Copyright © Materials Research Society 2007

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References

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