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大学・研究所にある論文を検索できる 「Role of pre-ionization in NBI plasma start-up of Heliotron J using non-resonant microwave heating」の論文概要。リケラボ論文検索は、全国の大学リポジトリにある学位論文・教授論文を一括検索できる論文検索サービスです。
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Role of pre-ionization in NBI plasma start-up of Heliotron J using non-resonant microwave heating

Kobayashi, S. Nagasaki, K. Hada, K. Stange, T. Okada, H. Minami, T. Kado, S. Ohshima, S. Tokuhara, K. Nakamura, Y. Ishizawa, A. Suzuki, Y. Osakabe, M. Murase, T. Konoshima, S. Mizuuchi, T. 京都大学 DOI:10.1088/1741-4326/ac2105

2021.11

概要

Here, we report on role of pre-ionization using non-resonant 2.45 GHz microwave heating (P2.45 GHz < 20 kW) in plasma start-up of neutral beam injection (NBI) for heliotron configurations in low beam power (PNB) under non-resonant heating condition. A rapid electron heating towards burn-through of the low-Z impurities was observed experimentally in the early phase of beam injection when the seed plasma density produced by the non-resonant heating was enough for the plasma start-up. Beam heating time to the burn-through increased with decreasing the seed plasma density and a critical density condition of the seed plasma for successful start-up was observed experimentally. Proper timing of the gas fuelling is critical for plasma expansion because the beam fuelling is not significant. A 0-dimensional (0D) model analysis of the NBI start-up developed in this study well reproduces the experimental results. The 0D model clarifies the physical mechanism of the NBI start-up using pre-ionization described as follows: (1) the seed plasma produces sufficient beam ions immediately after beam injection, (2) the beam ions heat up electrons that promote the ionization/dissociation of the background neutrals, (3) this process acts as a positive feedback loop resulting in further electron heating towards burn-through. The 0D model analysis shows that the critical density corresponds to the state at which the electron heating by the beam ions is equal to electron power loss due to conduction and ionization/dissociation.

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Acknowledgments

The authors would like to acknowledge the Heliotron J staff for

conducting the experiments. This work was partly supported

by the JSPS Grants-in-Aid for Scientific Research Kiban (B)

No. 19H01875 and JSPS core-to-core program ‘PLADyS’,

A. Advanced research networks, as well as the collaboration

program of the Laboratory for complex energy processes and

the Joint Usage/Research Center for Zero Emission Energy

Research, IAE, Kyoto Univ. and NIFS Collaborative Research

Program (NIFS10KUHL030, NIFS18KUHL087).

ORCID iDs

S. Kobayashi https://orcid.org/0000-0003-1075-2401

K. Nagasaki https://orcid.org/0000-0001-6423-1754

T. Minami https://orcid.org/0000-0003-1125-931X

S. Ohshima https://orcid.org/0000-0003-1341-4969

A. Ishizawa https://orcid.org/0000-0002-5323-8448

Y. Suzuki https://orcid.org/0000-0001-7618-6305

M. Osakabe https://orcid.org/0000-0001-5220-947X

...

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