Impact of pellet injection on extension of the operational region in LHD

R. Sakamoto; H. Yamada; K. Tanaka; K. Narihara; S. Morita; S. Sakakibara; S. Masuzaki; S. Inagaki; L. R. Baylor; P. W. Fisher; S. K. Combs; M. J. Gouge; S. Kato; A. Komori; O. Kaneko; N. Ashikawa; P. De Vries; M. Emoto; H. Funaba; M. Goto; K. Ida; H. Idei; K. Ikeda; M. Isobe; S. Kado; K. Kawahata; K. Khlopenkov; S. Kubo; R. Kumazawa; T. Minami; J. Miyazawa; T. Morisaki; S. Murakami; S. Muto; T. Mutoh; Y. Nagayama; Y. Nakamura; H. Nakanishi; K. Nishimura; N. Noda; T. Notake; T. Kobuchi; Y. Liang; S. Ohdachi; N. Ohyabu; Y. Oka; M. Osakabe; T. Ozaki; R. O. Pavlichenko; B. J. Peterson; A. Sagara; K. Saito; H. Sasao; M. Sasao; K. Sato; M. Sato; T. Seki; T. Shimozuma; M. Shoji; S. Sudo; H. Suzuki; M. Takechi; Y. Takeiri; N. Tamura; K. Toi; T. Tokuzawa; Y. Torii; K. Tsumori; I. Yamada; S. Yamaguchi; S. Yamamoto; Y. Yoshimura; K. Y. Watanabe; T. Watari; K. Yamazaki; Y. Hamada; O. Motojima; M. Fujiwara

doi:10.1088/0029-5515/41/4/304

Impact of pellet injection on extension of the operational region in LHD

R. Sakamoto, H. Yamada, K. Tanaka, K. Narihara, S. Morita, S. Sakakibara, S. Masuzaki, S. Inagaki, L. R. Baylor, P. W. Fisher, S. K. Combs, M. J. Gouge, S. Kato, A. Komori, O. Kaneko, N. Ashikawa, P. De Vries, M. Emoto, H. Funaba, M. GotoK. Ida, H. Idei, K. Ikeda, M. Isobe, S. Kado, K. Kawahata, K. Khlopenkov, S. Kubo, R. Kumazawa, T. Minami, J. Miyazawa, T. Morisaki, S. Murakami, S. Muto, T. Mutoh, Y. Nagayama, Y. Nakamura, H. Nakanishi, K. Nishimura, N. Noda, T. Notake, T. Kobuchi, Y. Liang, S. Ohdachi, N. Ohyabu, Y. Oka, M. Osakabe, T. Ozaki, R. O. Pavlichenko, B. J. Peterson, A. Sagara, K. Saito, H. Sasao, M. Sasao, K. Sato, M. Sato, T. Seki, T. Shimozuma, M. Shoji, S. Sudo, H. Suzuki, M. Takechi, Y. Takeiri, N. Tamura, K. Toi, T. Tokuzawa, Y. Torii, K. Tsumori, I. Yamada, S. Yamaguchi, S. Yamamoto, Y. Yoshimura, K. Y. Watanabe, T. Watari, K. Yamazaki, Y. Hamada, O. Motojima, M. Fujiwara

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57 Citations (Scopus)

Abstract

Pellet injection has been used as a primary fuelling scheme in the Large Helical Device. With pellet injection, the operational region of NBI plasmas has been extended to higher densities while maintaining a favourable dependence of energy confinement on density, and several important values, such as plasma stored energy of 0.88 MJ, energy confinement time of 0.3 s, β of 2.4% at 1.3 T and density of 1.1 × 10²⁰ m^-3, have been achieved. These parameters cannot be attained by gas puffing. Ablation and the subsequent behaviour of the plasma have been investigated. The measured pellet penetration depth estimated on the basis of the duration of the H_α emission is shallower than the depth predicted from the simple neutral gas shielding (NGS) model. It can be explained by the NGS model with inclusion of the effect of fast ions on the ablation. Just after ablation, the redistribution of the ablated pellet mass was observed on a short timescale (∼400 ms). The redistribution causes shallow deposition and low fuelling efficiency.

Original language	English
Pages (from-to)	381-386
Number of pages	6
Journal	Nuclear Fusion
Volume	41
Issue number	4
DOIs	https://doi.org/10.1088/0029-5515/41/4/304
Publication status	Published - Apr 2001
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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10.1088/0029-5515/41/4/304

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Sakamoto, R., Yamada, H., Tanaka, K., Narihara, K., Morita, S., Sakakibara, S., Masuzaki, S., Inagaki, S., Baylor, L. R., Fisher, P. W., Combs, S. K., Gouge, M. J., Kato, S., Komori, A., Kaneko, O., Ashikawa, N., De Vries, P., Emoto, M., Funaba, H., ... Fujiwara, M. (2001). Impact of pellet injection on extension of the operational region in LHD. Nuclear Fusion, 41(4), 381-386. https://doi.org/10.1088/0029-5515/41/4/304

Sakamoto, R, Yamada, H, Tanaka, K, Narihara, K, Morita, S, Sakakibara, S, Masuzaki, S, Inagaki, S, Baylor, LR, Fisher, PW, Combs, SK, Gouge, MJ, Kato, S, Komori, A, Kaneko, O, Ashikawa, N, De Vries, P, Emoto, M, Funaba, H, Goto, M, Ida, K, Idei, H, Ikeda, K, Isobe, M, Kado, S, Kawahata, K, Khlopenkov, K, Kubo, S, Kumazawa, R, Minami, T, Miyazawa, J, Morisaki, T, Murakami, S, Muto, S, Mutoh, T, Nagayama, Y, Nakamura, Y, Nakanishi, H, Nishimura, K, Noda, N, Notake, T, Kobuchi, T, Liang, Y, Ohdachi, S, Ohyabu, N, Oka, Y, Osakabe, M, Ozaki, T, Pavlichenko, RO, Peterson, BJ, Sagara, A, Saito, K, Sasao, H, Sasao, M, Sato, K, Sato, M, Seki, T, Shimozuma, T, Shoji, M, Sudo, S, Suzuki, H, Takechi, M, Takeiri, Y, Tamura, N, Toi, K, Tokuzawa, T, Torii, Y, Tsumori, K, Yamada, I, Yamaguchi, S, Yamamoto, S, Yoshimura, Y, Watanabe, KY, Watari, T, Yamazaki, K, Hamada, Y, Motojima, O & Fujiwara, M 2001, 'Impact of pellet injection on extension of the operational region in LHD', Nuclear Fusion, vol. 41, no. 4, pp. 381-386. https://doi.org/10.1088/0029-5515/41/4/304

@article{1dff222872ef49d5a15bbf3bb6e3f316,

title = "Impact of pellet injection on extension of the operational region in LHD",

abstract = "Pellet injection has been used as a primary fuelling scheme in the Large Helical Device. With pellet injection, the operational region of NBI plasmas has been extended to higher densities while maintaining a favourable dependence of energy confinement on density, and several important values, such as plasma stored energy of 0.88 MJ, energy confinement time of 0.3 s, β of 2.4% at 1.3 T and density of 1.1 × 1020 m-3, have been achieved. These parameters cannot be attained by gas puffing. Ablation and the subsequent behaviour of the plasma have been investigated. The measured pellet penetration depth estimated on the basis of the duration of the Hα emission is shallower than the depth predicted from the simple neutral gas shielding (NGS) model. It can be explained by the NGS model with inclusion of the effect of fast ions on the ablation. Just after ablation, the redistribution of the ablated pellet mass was observed on a short timescale (∼400 ms). The redistribution causes shallow deposition and low fuelling efficiency.",

author = "R. Sakamoto and H. Yamada and K. Tanaka and K. Narihara and S. Morita and S. Sakakibara and S. Masuzaki and S. Inagaki and Baylor, {L. R.} and Fisher, {P. W.} and Combs, {S. K.} and Gouge, {M. J.} and S. Kato and A. Komori and O. Kaneko and N. Ashikawa and {De Vries}, P. and M. Emoto and H. Funaba and M. Goto and K. Ida and H. Idei and K. Ikeda and M. Isobe and S. Kado and K. Kawahata and K. Khlopenkov and S. Kubo and R. Kumazawa and T. Minami and J. Miyazawa and T. Morisaki and S. Murakami and S. Muto and T. Mutoh and Y. Nagayama and Y. Nakamura and H. Nakanishi and K. Nishimura and N. Noda and T. Notake and T. Kobuchi and Y. Liang and S. Ohdachi and N. Ohyabu and Y. Oka and M. Osakabe and T. Ozaki and Pavlichenko, {R. O.} and Peterson, {B. J.} and A. Sagara and K. Saito and H. Sasao and M. Sasao and K. Sato and M. Sato and T. Seki and T. Shimozuma and M. Shoji and S. Sudo and H. Suzuki and M. Takechi and Y. Takeiri and N. Tamura and K. Toi and T. Tokuzawa and Y. Torii and K. Tsumori and I. Yamada and S. Yamaguchi and S. Yamamoto and Y. Yoshimura and Watanabe, {K. Y.} and T. Watari and K. Yamazaki and Y. Hamada and O. Motojima and M. Fujiwara",

year = "2001",

month = apr,

doi = "10.1088/0029-5515/41/4/304",

language = "English",

volume = "41",

pages = "381--386",

journal = "Nuclear Fusion",

issn = "0029-5515",

publisher = "IOP Publishing Ltd.",

number = "4",

}

TY - JOUR

T1 - Impact of pellet injection on extension of the operational region in LHD

AU - Sakamoto, R.

AU - Yamada, H.

AU - Tanaka, K.

AU - Narihara, K.

AU - Morita, S.

AU - Sakakibara, S.

AU - Masuzaki, S.

AU - Inagaki, S.

AU - Baylor, L. R.

AU - Fisher, P. W.

AU - Combs, S. K.

AU - Gouge, M. J.

AU - Kato, S.

AU - Komori, A.

AU - Kaneko, O.

AU - Ashikawa, N.

AU - De Vries, P.

AU - Emoto, M.

AU - Funaba, H.

AU - Goto, M.

AU - Ida, K.

AU - Idei, H.

AU - Ikeda, K.

AU - Isobe, M.

AU - Kado, S.

AU - Kawahata, K.

AU - Khlopenkov, K.

AU - Kubo, S.

AU - Kumazawa, R.

AU - Minami, T.

AU - Miyazawa, J.

AU - Morisaki, T.

AU - Murakami, S.

AU - Muto, S.

AU - Mutoh, T.

AU - Nagayama, Y.

AU - Nakamura, Y.

AU - Nakanishi, H.

AU - Nishimura, K.

AU - Noda, N.

AU - Notake, T.

AU - Kobuchi, T.

AU - Liang, Y.

AU - Ohdachi, S.

AU - Ohyabu, N.

AU - Oka, Y.

AU - Osakabe, M.

AU - Ozaki, T.

AU - Pavlichenko, R. O.

AU - Peterson, B. J.

AU - Sagara, A.

AU - Saito, K.

AU - Sasao, H.

AU - Sasao, M.

AU - Sato, K.

AU - Sato, M.

AU - Seki, T.

AU - Shimozuma, T.

AU - Shoji, M.

AU - Sudo, S.

AU - Suzuki, H.

AU - Takechi, M.

AU - Takeiri, Y.

AU - Tamura, N.

AU - Toi, K.

AU - Tokuzawa, T.

AU - Torii, Y.

AU - Tsumori, K.

AU - Yamada, I.

AU - Yamaguchi, S.

AU - Yamamoto, S.

AU - Yoshimura, Y.

AU - Watanabe, K. Y.

AU - Watari, T.

AU - Yamazaki, K.

AU - Hamada, Y.

AU - Motojima, O.

AU - Fujiwara, M.

PY - 2001/4

Y1 - 2001/4

N2 - Pellet injection has been used as a primary fuelling scheme in the Large Helical Device. With pellet injection, the operational region of NBI plasmas has been extended to higher densities while maintaining a favourable dependence of energy confinement on density, and several important values, such as plasma stored energy of 0.88 MJ, energy confinement time of 0.3 s, β of 2.4% at 1.3 T and density of 1.1 × 1020 m-3, have been achieved. These parameters cannot be attained by gas puffing. Ablation and the subsequent behaviour of the plasma have been investigated. The measured pellet penetration depth estimated on the basis of the duration of the Hα emission is shallower than the depth predicted from the simple neutral gas shielding (NGS) model. It can be explained by the NGS model with inclusion of the effect of fast ions on the ablation. Just after ablation, the redistribution of the ablated pellet mass was observed on a short timescale (∼400 ms). The redistribution causes shallow deposition and low fuelling efficiency.

AB - Pellet injection has been used as a primary fuelling scheme in the Large Helical Device. With pellet injection, the operational region of NBI plasmas has been extended to higher densities while maintaining a favourable dependence of energy confinement on density, and several important values, such as plasma stored energy of 0.88 MJ, energy confinement time of 0.3 s, β of 2.4% at 1.3 T and density of 1.1 × 1020 m-3, have been achieved. These parameters cannot be attained by gas puffing. Ablation and the subsequent behaviour of the plasma have been investigated. The measured pellet penetration depth estimated on the basis of the duration of the Hα emission is shallower than the depth predicted from the simple neutral gas shielding (NGS) model. It can be explained by the NGS model with inclusion of the effect of fast ions on the ablation. Just after ablation, the redistribution of the ablated pellet mass was observed on a short timescale (∼400 ms). The redistribution causes shallow deposition and low fuelling efficiency.

UR - http://www.scopus.com/inward/record.url?scp=0035323784&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035323784&partnerID=8YFLogxK

U2 - 10.1088/0029-5515/41/4/304

DO - 10.1088/0029-5515/41/4/304

M3 - Article

AN - SCOPUS:0035323784

SN - 0029-5515

VL - 41

SP - 381

EP - 386

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 4

ER -

Impact of pellet injection on extension of the operational region in LHD

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