Formation of interstitial loops in tungsten under helium ion irradiation: Rate theory modeling and experiment

Watanabe, Yoshihisa; Iwakiri, Hirotomo; Yoshida, N.; Morishita, Kazunori; Kohyama, Akira

doi:10.1016/j.nimb.2006.11.008

Cited by 51 publications

(40 citation statements)

References 17 publications

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“…Related theoretical works have also been performed based on the cluster dynamics model [13,14] and kinetic Monte Carlo (KMC) model [15,16] recently. Watanabe et al [13] studied the formation of interstitial loops in W under He ion irradiation by using rate theory modeling and compared the results with experiment. Xu et al [14] have investigated the effects of He on the microstructure evolution in W during He and neutron irradiations based on a simple model using rate theory.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, although different types of irradiation occur simultaneously in actual fusion devices, they are usually treated individually for simplicity, such as for He or hydrogen plasma with different energies and fluxes irradiation on different PFMs [3,5,8,[10][11][12][13]. Recently, experiments have been performed to study the synergistic effects, such as, He irradiations with high heat loads [6] or with different temperatures [4,7] and deuterium plasma irradiation with low-energy He plasma pre-exposure [9].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Cluster dynamics modeling of accumulation and diffusion of helium in neutron irradiated tungsten

Zhou

Huang

et al. 2012

Journal of Nuclear Materials

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cluster dynamics modeling of accumulation and diffusion of helium in neutron irradiated tungsten

Zhou

Huang

et al. 2012

Journal of Nuclear Materials

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“…Numerous computational works have been also performed to understand the atomic scale phenomena such as defect configurations in W. The first-principles calculations [11][12][13][14], molecular dynamics (MD) simulations [14][15][16], kinetic Monte Carlo (KMC) simulations [14], and the rate theory [17] have been undertaken to investigate the vacancy, interstitial defects, cluster formation of He or H. In fact, He and H are present simultaneously in W after irradiation, however, the atomic scale simulations on the coexistence of the He and H atoms have seldom studied so far.…”

Section: Introductionmentioning

confidence: 99%

Energetics of He and H atoms with vacancies in tungsten: First-principles approach

Lee

2009

Journal of Nuclear Materials

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“…Вторым возможным механизмом является уменьшение концентрации вакансий вследствие роста ге-лиевых пузырьков и образования межузлий и дислокационных петель [56,57]. При этом предполагается возможность взаимодействия вакансий с межузельными атомами, что приводит к уменьшению количе-ства ловушек, способных захватывать дейтерий.…”

Section: накопление дейтерия в вольфраме содержащем ионно-индуцироваunclassified

Deuterium Retention in Tungsten Exposed to Helium-Seeded Deuterium Plasma. Review of Recent Experimental Results

Alimov¹,

Спицын²,

Bobyr³

2015

PAST-TF

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Снижение содержания трития в материалах термоядерных реакторов в процессе эксплуатации является важной задачей. Вольфрам рассматривается в качестве приоритетного материала для защиты дивертора и первой стенки перспективных термо-ядерных установок. При горении термоядерной плазмы вольфрам будет подвергаться воздействию интенсивных потоков уско-ренных частиц дейтерия (D), трития (T) и гелия (He). В настоящей статье представлены результаты недавних (2008-2014 гг.) экспериментов, посвящённых накоплению дейтерия в вольфраме при облучении высокопоточной дейтериевой плазмой с при-месью гелия, выполненных в Японском агентстве по атомной энергии (Япония), Институте физики плазмы Макса Планка (Гер-мания) и НИЦ «Курчатовский институт» (Россия). Показано, что добавление ионов гелия в дейтериевую плазму значительно уменьшает содержание дейтерия как в вольфраме, не содержащем ионно-индуцированные дефекты, так и в радиационно по-вреждённом вольфраме по сравнению с содержанием дейтерия после облучения чистой дейтериевой плазмой. Обнаружено, что значительная часть дейтерия, захваченного первоначально в вольфраме после облучения дейтериевой плазмой, выделяется при последующем облучении протиевой плазмой. Однако в случае облучения образцов смешанной гелиево-протиевой плазмой количество выделяющегося дейтерия уменьшается по сравнению с облучением чистой протиевой плазмой.Ключевые слова: вольфрам, дейтериевая плазма, гелий-дейтериевая плазма, накопление дейтерия, изотопный обмен водорода. Reduction of the tritium accumulation is important requirement for fusion reactor materials. Tungsten is promising material for protect a first wall of the vacuum chamber of fusion devices. The tungsten plates will be exposed to intense fluxes of accelerated of deuterium (D), tritium (T), helium (He) particles from fusion plasma. Results of recent studies (2008-2014) on deuterium retention in tungsten exposed to high flux helium-seeded deuterium plasma carried out in Japan Atomic Energy Agency (Japan), Max-Planck Institute for Plasma Physics (Germany) and NRC «Kurchatov Institute» (Russia) are summarized in the present review. It has been shown that addition of helium ions into the D plasma at elevated temperatures significantly reduces the D retention in tungsten, both without and with ioninduced defects, compared to that for the pure plasma exposure. It has been also found that significant part of deuterium initially retained in tungsten after deuterium plasma exposure is released during sequential exposure to protium plasma. However, exposure of the D-plasmaexposed W samples to helium-protium plasma reduces the amount of released deuterium as compared to pure protium plasma irradiation. DEUTERIUM RETENTION IN TUNGSTEN EXPOSED TO HELIUM-SEEDED DEUTERIUM PLASMA. REVIEW OF RECENT EXPERIMENTAL RESULTS

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Formation of interstitial loops in tungsten under helium ion irradiation: Rate theory modeling and experiment

Cited by 51 publications

References 17 publications

Cluster dynamics modeling of accumulation and diffusion of helium in neutron irradiated tungsten

Cluster dynamics modeling of accumulation and diffusion of helium in neutron irradiated tungsten

Energetics of He and H atoms with vacancies in tungsten: First-principles approach

Deuterium Retention in Tungsten Exposed to Helium-Seeded Deuterium Plasma. Review of Recent Experimental Results

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