Energetic particle experiments in JT-60U and their implications for a fusion reactor

K. Tobita; Y. Kusama; K. Shinohara; T. Nishitani; H. Kimura; G. J. Kramer; M. Nemoto; T. Kondoh; T. Oikawa; A. Morioka; K. Hamamatsu; S. Wang; S. Takeji; M. Takechi; M. Ishikawa; K. Tani; M. Saigusa; T. Ozeki

doi:10.13182/FST02-A231

Energetic particle experiments in JT-60U and their implications for a fusion reactor

K. Tobita
, Y. Kusama
, K. Shinohara
, T. Nishitani
, H. Kimura
, G. J. Kramer
, M. Nemoto
, T. Kondoh
, T. Oikawa
, A. Morioka
, K. Hamamatsu
, S. Wang
, S. Takeji
, M. Takechi
, M. Ishikawa
, K. Tani
, M. Saigusa
, T. Ozeki

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

Energetic particle experiments in JT-60U are summarized, mainly covering ripple loss and Alfvén eigen-modes (AE modes). Significant loss was observed for 85 keV neutral beam injected (NBI) ions and fusion-produced tritons as toroidal field ripple at the plasma surface increased, especially in a reversed shear plasma. Measurement of hot spots on the first wall due to ripple loss confirmed agreement with code predictions, validating the modeling incorporated in an orbit-following Monte Carlo code. A variety of AE modes were destabilized in ion cyclotron range of frequencies (ICRF) minority heating and negative-ion-based NBI (N-NBI) heating. Most of the observed modes are gap modes identified to be toroidicity-induced, ellipticity-induced, and triangularity-induced AE modes. An interesting finding is pulsating modes accompanying frequency sweep, which were de-stabilized by N-NBI and sometimes induced a beam ion loss of up to 25%. Also presented are energetic particle issues in auxiliary heating with ICRF and N-NBI.

Original language	English (US)
Pages (from-to)	315-326
Number of pages	12
Journal	Fusion Science and Technology
Volume	42
Issue number	2-3
DOIs	https://doi.org/10.13182/FST02-A231
State	Published - 2002
Externally published	Yes

All Science Journal Classification (ASJC) codes

Civil and Structural Engineering
Nuclear and High Energy Physics
Nuclear Energy and Engineering
General Materials Science
Mechanical Engineering

Keywords

Alfvén eigenmode
Energetic particle
Ripple loss

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10.13182/FST02-A231

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Tobita, K., Kusama, Y., Shinohara, K., Nishitani, T., Kimura, H., Kramer, G. J., Nemoto, M., Kondoh, T., Oikawa, T., Morioka, A., Hamamatsu, K., Wang, S., Takeji, S., Takechi, M., Ishikawa, M., Tani, K., Saigusa, M., & Ozeki, T. (2002). Energetic particle experiments in JT-60U and their implications for a fusion reactor. Fusion Science and Technology, 42(2-3), 315-326. https://doi.org/10.13182/FST02-A231

@article{ef864a4d36d44cd5bad6c48661f3ecc5,

title = "Energetic particle experiments in JT-60U and their implications for a fusion reactor",

abstract = "Energetic particle experiments in JT-60U are summarized, mainly covering ripple loss and Alfv{\'e}n eigen-modes (AE modes). Significant loss was observed for 85 keV neutral beam injected (NBI) ions and fusion-produced tritons as toroidal field ripple at the plasma surface increased, especially in a reversed shear plasma. Measurement of hot spots on the first wall due to ripple loss confirmed agreement with code predictions, validating the modeling incorporated in an orbit-following Monte Carlo code. A variety of AE modes were destabilized in ion cyclotron range of frequencies (ICRF) minority heating and negative-ion-based NBI (N-NBI) heating. Most of the observed modes are gap modes identified to be toroidicity-induced, ellipticity-induced, and triangularity-induced AE modes. An interesting finding is pulsating modes accompanying frequency sweep, which were de-stabilized by N-NBI and sometimes induced a beam ion loss of up to 25\%. Also presented are energetic particle issues in auxiliary heating with ICRF and N-NBI.",

keywords = "Alfv{\'e}n eigenmode, Energetic particle, Ripple loss",

author = "K. Tobita and Y. Kusama and K. Shinohara and T. Nishitani and H. Kimura and Kramer, \{G. J.\} and M. Nemoto and T. Kondoh and T. Oikawa and A. Morioka and K. Hamamatsu and S. Wang and S. Takeji and M. Takechi and M. Ishikawa and K. Tani and M. Saigusa and T. Ozeki",

year = "2002",

doi = "10.13182/FST02-A231",

language = "English (US)",

volume = "42",

pages = "315--326",

journal = "Fusion Science and Technology",

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publisher = "Taylor and Francis Ltd.",

number = "2-3",

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Tobita, K, Kusama, Y, Shinohara, K, Nishitani, T, Kimura, H, Kramer, GJ, Nemoto, M, Kondoh, T, Oikawa, T, Morioka, A, Hamamatsu, K, Wang, S, Takeji, S, Takechi, M, Ishikawa, M, Tani, K, Saigusa, M & Ozeki, T 2002, 'Energetic particle experiments in JT-60U and their implications for a fusion reactor', Fusion Science and Technology, vol. 42, no. 2-3, pp. 315-326. https://doi.org/10.13182/FST02-A231

TY - JOUR

T1 - Energetic particle experiments in JT-60U and their implications for a fusion reactor

AU - Tobita, K.

AU - Kusama, Y.

AU - Shinohara, K.

AU - Nishitani, T.

AU - Kimura, H.

AU - Kramer, G. J.

AU - Nemoto, M.

AU - Kondoh, T.

AU - Oikawa, T.

AU - Morioka, A.

AU - Hamamatsu, K.

AU - Wang, S.

AU - Takeji, S.

AU - Takechi, M.

AU - Ishikawa, M.

AU - Tani, K.

AU - Saigusa, M.

AU - Ozeki, T.

PY - 2002

Y1 - 2002

N2 - Energetic particle experiments in JT-60U are summarized, mainly covering ripple loss and Alfvén eigen-modes (AE modes). Significant loss was observed for 85 keV neutral beam injected (NBI) ions and fusion-produced tritons as toroidal field ripple at the plasma surface increased, especially in a reversed shear plasma. Measurement of hot spots on the first wall due to ripple loss confirmed agreement with code predictions, validating the modeling incorporated in an orbit-following Monte Carlo code. A variety of AE modes were destabilized in ion cyclotron range of frequencies (ICRF) minority heating and negative-ion-based NBI (N-NBI) heating. Most of the observed modes are gap modes identified to be toroidicity-induced, ellipticity-induced, and triangularity-induced AE modes. An interesting finding is pulsating modes accompanying frequency sweep, which were de-stabilized by N-NBI and sometimes induced a beam ion loss of up to 25%. Also presented are energetic particle issues in auxiliary heating with ICRF and N-NBI.

AB - Energetic particle experiments in JT-60U are summarized, mainly covering ripple loss and Alfvén eigen-modes (AE modes). Significant loss was observed for 85 keV neutral beam injected (NBI) ions and fusion-produced tritons as toroidal field ripple at the plasma surface increased, especially in a reversed shear plasma. Measurement of hot spots on the first wall due to ripple loss confirmed agreement with code predictions, validating the modeling incorporated in an orbit-following Monte Carlo code. A variety of AE modes were destabilized in ion cyclotron range of frequencies (ICRF) minority heating and negative-ion-based NBI (N-NBI) heating. Most of the observed modes are gap modes identified to be toroidicity-induced, ellipticity-induced, and triangularity-induced AE modes. An interesting finding is pulsating modes accompanying frequency sweep, which were de-stabilized by N-NBI and sometimes induced a beam ion loss of up to 25%. Also presented are energetic particle issues in auxiliary heating with ICRF and N-NBI.

KW - Alfvén eigenmode

KW - Energetic particle

KW - Ripple loss

UR - https://www.scopus.com/pages/publications/0036752953

UR - https://www.scopus.com/pages/publications/0036752953#tab=citedBy

U2 - 10.13182/FST02-A231

DO - 10.13182/FST02-A231

M3 - Article

AN - SCOPUS:0036752953

SN - 1536-1055

VL - 42

SP - 315

EP - 326

JO - Fusion Science and Technology

JF - Fusion Science and Technology

IS - 2-3

ER -

Energetic particle experiments in JT-60U and their implications for a fusion reactor

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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