Influence of the Initial Defect Structure on Helium Trapping in Tungsten under Ion Implantation


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Abstract

The trapping of helium in tungsten irradiated with He+ ions with an energy of 3 keV and fluence of 1019–1022 He/m2 at room temperature was studied by thermal desorption spectroscopy and scanning electron microscopy. Both as-prepared and recrystallized (at 2000 K for 30 min prior to irradiation) tungsten foils with a thickness of 50 μm were used. It was found that the initial structure of tungsten affects both the dynamics of helium accumulation and the size of defects formed in the process of irradiation and subsequent heating. At low irradiation fluences, helium desorption proceeds primarily at 2000–2500 K in recrystallized tungsten and at 1100–1900 K in as-prepared tungsten samples. At high fluences (higher than 1021 He/m2), a considerable amount of helium is released at low temperatures (starting from 400 K), but a significant fraction of it remains in the samples even after heating to maximum temperatures. Analysis of cross-section of the samples performed after thermal desorption revealed pores 10–75 nm in diameter. The largest pores were formed in the samples that were recrystallized prior to irradiation.

About the authors

S. A. Ryabtsev

National Research Nuclear University MEPhI (Moscow Engineering Physics Institute)

Author for correspondence.
Email: ryabtsev91@mail.ru
Russian Federation, Moscow, 115409

Yu. M. Gasparyan

National Research Nuclear University MEPhI (Moscow Engineering Physics Institute)

Email: ryabtsev91@mail.ru
Russian Federation, Moscow, 115409

V. S. Efimov

National Research Nuclear University MEPhI (Moscow Engineering Physics Institute)

Email: ryabtsev91@mail.ru
Russian Federation, Moscow, 115409

Z. R. Harutyunyan

National Research Nuclear University MEPhI (Moscow Engineering Physics Institute)

Email: ryabtsev91@mail.ru
Russian Federation, Moscow, 115409

A. G. Poskakalov

National Research Nuclear University MEPhI (Moscow Engineering Physics Institute)

Email: ryabtsev91@mail.ru
Russian Federation, Moscow, 115409

A. A. Pisarev

National Research Nuclear University MEPhI (Moscow Engineering Physics Institute)

Email: ryabtsev91@mail.ru
Russian Federation, Moscow, 115409

S. L. Kanashenko

Orekhovich Research Institute of Biomedical Chemistry

Email: ryabtsev91@mail.ru
Russian Federation, Moscow, 119435

Yu. D. Ivanov

Orekhovich Research Institute of Biomedical Chemistry

Email: ryabtsev91@mail.ru
Russian Federation, Moscow, 119435

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