Impact of Radiation Damage on Fuel Retention in JET

Impact of radiation damage on fuel retention: Ion-damage of Mo samples at DCF June 2017

Anna Widdowson1,*, K Heinola2, I Jepu3, Sunwoo Moon4, P Petersson4, M Rubel4 and JET contributors†
EUROfusion Consortium, JET, Culham Science Centre, Abingdon, OX14 3DB, UK
1Culham Centre for Fusion Energy, Culham Science Centre, Abingdon, OX14 3DB, UK
2International Atomic Energy Agency, Vienna International Centre, PO Box 100, 1400 Vienna, Austria
3National Institute for Laser, Plasma and Radiation Physics, 077125, Romania
4 Royal Institute of Technology (KTH), SE-1044 Stockholm, Sweden

See the author list of X. Litaudon et al 2017 Nucl. Fusion 57 102001

This work is part of a long running project to study mirrors exposed in fusion devices for ITER (Ivanova et al. 2014)(Garcia-Carrasco et al. 2017). This is the next step in understanding the effects of irradiation on hydrogen isotope retention and reflectivity in fusion devises.

(i) Expose self-irradiated and non-irradiated samples in JET to investigate hydrogen isotope (fuel) retention.
(ii) Study changes in reflectivity of mirror surfaces due to irradiation.

In order to further this work self-irradiated Mo mirror samples were prepared at Dalton Cumbria Facility in June 2017 for exposure in the JET main chamber alongside non-irradiated samples. After exposure in JET the surfaces of the samples will be analysed using ion beam techniques to ascertain fuel retained and reflectivity will be measured. Further analysis of exposed samples may include TEM to study differences in microstructure and thermal desorption to determine total fuel inventory and differences in trapping sites between irradiated and non-irradiated surfaces.

Garcia-Carrasco, et al. 2017. “Plasma Impact on Diagnostic Mirrors in JET.” Nuclear Materials and Energy. doi:10.1016/j.nme.2016.12.032.

Ivanova, D, et al. 2014. “An Overview of the Comprehensive First Mirror Test in JET with ITER-like Wall.” Physica Scripta T159 (T159). IOP Publishing: 014011. doi:10.1088/0031-8949/2014/T159/014011.


2020-07-09 11:34:47

Why should radiation damage change the reflectivity? Would carbon contamination be more or less influential on the reflectivity?

2020-07-10 10:53:26

Are you sure those features in the SEM of the 2 and 20 dpa samples are voids? They would be VERY large if so. Why should radiation damage affect reflectivity, and would carbon contamination be more or less influential? Thanks!

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