Abstract
The Large Helical Device (LHD) experiments have started after a construction period of eight years, and two experimental campaigns were performed in 1998. The magnetic field was raised up to 2.75 T at a magnetic axis position of 3.6. m at the end of the second campaign. In the third campaign, started in July in 1999, the plasma production with ECH of 0.9 MW and auxiliary heating with NBI of 3.5 MW have achieved an electron temperature of 3.5 keV and an ion temperature of 2.4 keV. The maximum stored energy has reached 0.75 MJ with an averaged electron density of 7.7×10 19 m -3 by hydrogen pellet injection. The ICRF heating has sustained the plasma for longer than 2 s and the initial stored energy of the NBI target plasma has increased from 0.27 MJ to 0.335 MJ. The major characteristic of the LHD plasma is the formation of the temperature pedestal, which leads to some enhancement of energy confinement over the ISS95 scaling law. The confinement characteristic is gyro-Bohm and the maximum energy confinement has reached 0.28 s. The LHD has also shown its high potentiality for steady-state operation by realizing a 22 s discharge in the second campaign.
| Original language | English |
|---|---|
| Pages (from-to) | 1165-1177 |
| Number of pages | 13 |
| Journal | Plasma Physics and Controlled Fusion |
| Volume | 42 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - Nov 1 2000 |
| Externally published | Yes |
| Event | 12th International Stellarator Workshop - Madison, WI, USA Duration: Sep 27 1999 → Oct 1 1999 |
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All Science Journal Classification (ASJC) codes
- Nuclear Energy and Engineering
- Condensed Matter Physics
Cite this
Overview of the Large Helical Device. / Komori, A.; Yamada, H.; Kaneko, O.; Ohyabu, N.; Kawahata, K.; Sakamoto, R.; Sakakibara, S.; Ashikawa, N.; DeVries, P. C.; Emoto, M.; Funaba, H.; Goto, M.; Ida, K.; Idei, Hiroshi; Ikeda, K.; Shigeru, Inagaki; Inoue, N.; Isobe, M.; Kado, S.; Kubo, S.; Kumazawa, R.; Masuzaki, S.; Minami, T.; Miyazawa, J.; Morisaki, T.; Morita, S.; Murakami, S.; Muto, S.; Mutoh, T.; Nagayama, Y.; Nakamura, Y.; Nakanishi, H.; Narihara, K.; Nishimura, K.; Noda, N.; Kobuchi, T.; Ohdachi, S.; Oka, Y.; Osakabe, M.; Ozaki, T.; Peterson, B. J.; Saito, K.; Sagara, A.; Sasao, H.; Sasao, M.; Sato, K.; Sato, M.; Seki, T.; Shimozuma, T.; Shoji, M.; Suzuki, H.; Takechi, M.; Takeiri, Y.; Tanaka, K.; Toi, K.; Tokuzawa, T.; Tsumori, K.; Yamada, I.; Yamaguchi, S.; Yamamoto, S.; Yokoyama, M.; Yoshimura, Y.; Watanabe, K. Y.; Watanabe, T.; Watari, T.; Hamada, Y.; Itoh, K.; Matsuoka, K.; Murai, K.; Ohkubo, K.; Ohtake, I.; Okamoto, M.; Satoh, S.; Satow, T.; Sudo, S.; Tanahashi, S.; Yamazaki, K.; Motojima, O.; Fujiwara, M.
In: Plasma Physics and Controlled Fusion, Vol. 42, No. 11, 01.11.2000, p. 1165-1177.Research output: Contribution to journal › Conference article
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TY - JOUR
T1 - Overview of the Large Helical Device
AU - Komori, A.
AU - Yamada, H.
AU - Kaneko, O.
AU - Ohyabu, N.
AU - Kawahata, K.
AU - Sakamoto, R.
AU - Sakakibara, S.
AU - Ashikawa, N.
AU - DeVries, P. C.
AU - Emoto, M.
AU - Funaba, H.
AU - Goto, M.
AU - Ida, K.
AU - Idei, Hiroshi
AU - Ikeda, K.
AU - Shigeru, Inagaki
AU - Inoue, N.
AU - Isobe, M.
AU - Kado, S.
AU - Kubo, S.
AU - Kumazawa, R.
AU - Masuzaki, S.
AU - Minami, T.
AU - Miyazawa, J.
AU - Morisaki, T.
AU - Morita, S.
AU - Murakami, S.
AU - Muto, S.
AU - Mutoh, T.
AU - Nagayama, Y.
AU - Nakamura, Y.
AU - Nakanishi, H.
AU - Narihara, K.
AU - Nishimura, K.
AU - Noda, N.
AU - Kobuchi, T.
AU - Ohdachi, S.
AU - Oka, Y.
AU - Osakabe, M.
AU - Ozaki, T.
AU - Peterson, B. J.
AU - Saito, K.
AU - Sagara, A.
AU - Sasao, H.
AU - Sasao, M.
AU - Sato, K.
AU - Sato, M.
AU - Seki, T.
AU - Shimozuma, T.
AU - Shoji, M.
AU - Suzuki, H.
AU - Takechi, M.
AU - Takeiri, Y.
AU - Tanaka, K.
AU - Toi, K.
AU - Tokuzawa, T.
AU - Tsumori, K.
AU - Yamada, I.
AU - Yamaguchi, S.
AU - Yamamoto, S.
AU - Yokoyama, M.
AU - Yoshimura, Y.
AU - Watanabe, K. Y.
AU - Watanabe, T.
AU - Watari, T.
AU - Hamada, Y.
AU - Itoh, K.
AU - Matsuoka, K.
AU - Murai, K.
AU - Ohkubo, K.
AU - Ohtake, I.
AU - Okamoto, M.
AU - Satoh, S.
AU - Satow, T.
AU - Sudo, S.
AU - Tanahashi, S.
AU - Yamazaki, K.
AU - Motojima, O.
AU - Fujiwara, M.
PY - 2000/11/1
Y1 - 2000/11/1
N2 - The Large Helical Device (LHD) experiments have started after a construction period of eight years, and two experimental campaigns were performed in 1998. The magnetic field was raised up to 2.75 T at a magnetic axis position of 3.6. m at the end of the second campaign. In the third campaign, started in July in 1999, the plasma production with ECH of 0.9 MW and auxiliary heating with NBI of 3.5 MW have achieved an electron temperature of 3.5 keV and an ion temperature of 2.4 keV. The maximum stored energy has reached 0.75 MJ with an averaged electron density of 7.7×10 19 m -3 by hydrogen pellet injection. The ICRF heating has sustained the plasma for longer than 2 s and the initial stored energy of the NBI target plasma has increased from 0.27 MJ to 0.335 MJ. The major characteristic of the LHD plasma is the formation of the temperature pedestal, which leads to some enhancement of energy confinement over the ISS95 scaling law. The confinement characteristic is gyro-Bohm and the maximum energy confinement has reached 0.28 s. The LHD has also shown its high potentiality for steady-state operation by realizing a 22 s discharge in the second campaign.
AB - The Large Helical Device (LHD) experiments have started after a construction period of eight years, and two experimental campaigns were performed in 1998. The magnetic field was raised up to 2.75 T at a magnetic axis position of 3.6. m at the end of the second campaign. In the third campaign, started in July in 1999, the plasma production with ECH of 0.9 MW and auxiliary heating with NBI of 3.5 MW have achieved an electron temperature of 3.5 keV and an ion temperature of 2.4 keV. The maximum stored energy has reached 0.75 MJ with an averaged electron density of 7.7×10 19 m -3 by hydrogen pellet injection. The ICRF heating has sustained the plasma for longer than 2 s and the initial stored energy of the NBI target plasma has increased from 0.27 MJ to 0.335 MJ. The major characteristic of the LHD plasma is the formation of the temperature pedestal, which leads to some enhancement of energy confinement over the ISS95 scaling law. The confinement characteristic is gyro-Bohm and the maximum energy confinement has reached 0.28 s. The LHD has also shown its high potentiality for steady-state operation by realizing a 22 s discharge in the second campaign.
UR - http://www.scopus.com/inward/record.url?scp=0034318785&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0034318785&partnerID=8YFLogxK
U2 - 10.1088/0741-3335/42/11/303
DO - 10.1088/0741-3335/42/11/303
M3 - Conference article
AN - SCOPUS:0034318785
VL - 42
SP - 1165
EP - 1177
JO - Plasma Physics and Controlled Fusion
JF - Plasma Physics and Controlled Fusion
SN - 0741-3335
IS - 11
ER -