### 抄録

Clarification of tritium transfer in blanket is an important issue for realizing fusion reactor. We perform an experiment of simultaneous H and D permeation through Li_{17}Pb_{83} by means of an unsteady permeation method in order to clarify the interactions and isotope effects between H and D atoms. The experiment is conducted under the condition where the Sieverts' law holds. As a result, it is found that (i) H and D atoms permeate independently regardless of the H/D component ratio in the upstream gas and (ii) diffusion process is the rate-determining step in the overall permeation process. The diffusivity of H is around 1.4 times larger than that of D. The solubility of H is close to that of D. We estimate two vibration modes at an absorption site and a saddle point of H in Li_{17}Pb_{83} based on the ratio of isotope effect. It is considered that the zero-point vibration energy of H at the absorption site in Li_{17}Pb_{83} is around 0.173 eV and that at the saddle point is around 0.235 eV. The ratio of isotope effect is almost in proportion to the square root of mass ratio of D to H. The diffusivity of T can be estimated as 1/1.7 times of H.

元の言語 | 英語 |
---|---|

記事番号 | 2405074 |

ジャーナル | Plasma and Fusion Research |

巻 | 7 |

発行部数 | SPL.ISS.1 |

DOI | |

出版物ステータス | 出版済み - 12 1 2012 |

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### All Science Journal Classification (ASJC) codes

- Condensed Matter Physics

### これを引用

*Plasma and Fusion Research*,

*7*(SPL.ISS.1), [2405074]. https://doi.org/10.1585/pfr.7.2405074

**Analysis of simultaneous H and D permeation through lithium-lead.** / Okada, Makoto; Edao, Yuki; Okitsu, Hiroaki; Fukada, Satoshi.

研究成果: ジャーナルへの寄稿 › 記事

*Plasma and Fusion Research*, 巻. 7, 番号 SPL.ISS.1, 2405074. https://doi.org/10.1585/pfr.7.2405074

}

TY - JOUR

T1 - Analysis of simultaneous H and D permeation through lithium-lead

AU - Okada, Makoto

AU - Edao, Yuki

AU - Okitsu, Hiroaki

AU - Fukada, Satoshi

PY - 2012/12/1

Y1 - 2012/12/1

N2 - Clarification of tritium transfer in blanket is an important issue for realizing fusion reactor. We perform an experiment of simultaneous H and D permeation through Li17Pb83 by means of an unsteady permeation method in order to clarify the interactions and isotope effects between H and D atoms. The experiment is conducted under the condition where the Sieverts' law holds. As a result, it is found that (i) H and D atoms permeate independently regardless of the H/D component ratio in the upstream gas and (ii) diffusion process is the rate-determining step in the overall permeation process. The diffusivity of H is around 1.4 times larger than that of D. The solubility of H is close to that of D. We estimate two vibration modes at an absorption site and a saddle point of H in Li17Pb83 based on the ratio of isotope effect. It is considered that the zero-point vibration energy of H at the absorption site in Li17Pb83 is around 0.173 eV and that at the saddle point is around 0.235 eV. The ratio of isotope effect is almost in proportion to the square root of mass ratio of D to H. The diffusivity of T can be estimated as 1/1.7 times of H.

AB - Clarification of tritium transfer in blanket is an important issue for realizing fusion reactor. We perform an experiment of simultaneous H and D permeation through Li17Pb83 by means of an unsteady permeation method in order to clarify the interactions and isotope effects between H and D atoms. The experiment is conducted under the condition where the Sieverts' law holds. As a result, it is found that (i) H and D atoms permeate independently regardless of the H/D component ratio in the upstream gas and (ii) diffusion process is the rate-determining step in the overall permeation process. The diffusivity of H is around 1.4 times larger than that of D. The solubility of H is close to that of D. We estimate two vibration modes at an absorption site and a saddle point of H in Li17Pb83 based on the ratio of isotope effect. It is considered that the zero-point vibration energy of H at the absorption site in Li17Pb83 is around 0.173 eV and that at the saddle point is around 0.235 eV. The ratio of isotope effect is almost in proportion to the square root of mass ratio of D to H. The diffusivity of T can be estimated as 1/1.7 times of H.

UR - http://www.scopus.com/inward/record.url?scp=84879100583&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84879100583&partnerID=8YFLogxK

U2 - 10.1585/pfr.7.2405074

DO - 10.1585/pfr.7.2405074

M3 - Article

AN - SCOPUS:84879100583

VL - 7

JO - Plasma and Fusion Research

JF - Plasma and Fusion Research

SN - 1880-6821

IS - SPL.ISS.1

M1 - 2405074

ER -