Stabilization and Destabilization of Sawtooth Oscillations by Lower Hybrid Current Drive in the WT-3 Tokamak

Motomi Iida; Takashi Maekawa; Hitoshi Tanaka; Shunsuke Ide; Kazuo Ogura; Kazuaki Hanada; Mikito Iwamasa; Takehiko Itoh; Yasushi Terumichi; Shigetoshi Tanaka

doi:10.1143/JPSJ.57.3661

Stabilization and Destabilization of Sawtooth Oscillations by Lower Hybrid Current Drive in the WT-3 Tokamak

Motomi Iida, Takashi Maekawa, Hitoshi Tanaka, Shunsuke Ide, Kazuo Ogura, Kazuaki Hanada, Mikito Iwamasa, Takehiko Itoh, Yasushi Terumichi, Shigetoshi Tanaka

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

7 Citations (Scopus)

Abstract

Sawtooth oscillations appearing in Ohmically heated (OH) plasmas are suppressed by the lower hybrid current drive (LHCD) in the WT-3 tokamak (R = 65 cm, a = 20 cm, I_p ≃ 100 kA, n_e = 1 – 2 × 10¹³ cm^–3, q_a ≃ 4.5, and P_LH ≳ 100 kW). After the suppression, sawteeth reappear following m = 1 oscillations in the LHCD plasmas. The latter sawteeth have a large amplitude and long period (T_s = 2–5 msec), compared with the former one (T_s = 0.5–1.5 msec). Furthermore, they do not accompany a precursor and crash very fast.

Original language	English
Pages (from-to)	3661-3664
Number of pages	4
Journal	journal of the physical society of japan
Volume	57
Issue number	11
DOIs	https://doi.org/10.1143/JPSJ.57.3661
Publication status	Published - 1988
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1143/JPSJ.57.3661

Cite this

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title = "Stabilization and Destabilization of Sawtooth Oscillations by Lower Hybrid Current Drive in the WT-3 Tokamak",

abstract = "Sawtooth oscillations appearing in Ohmically heated (OH) plasmas are suppressed by the lower hybrid current drive (LHCD) in the WT-3 tokamak (R = 65 cm, a = 20 cm, Ip ≃ 100 kA, ne = 1 – 2 × 1013 cm–3, qa ≃ 4.5, and PLH ≳ 100 kW). After the suppression, sawteeth reappear following m = 1 oscillations in the LHCD plasmas. The latter sawteeth have a large amplitude and long period (Ts = 2–5 msec), compared with the former one (Ts = 0.5–1.5 msec). Furthermore, they do not accompany a precursor and crash very fast.",

author = "Motomi Iida and Takashi Maekawa and Hitoshi Tanaka and Shunsuke Ide and Kazuo Ogura and Kazuaki Hanada and Mikito Iwamasa and Takehiko Itoh and Yasushi Terumichi and Shigetoshi Tanaka",

year = "1988",

doi = "10.1143/JPSJ.57.3661",

language = "English",

volume = "57",

pages = "3661--3664",

journal = "Journal of the Physical Society of Japan",

issn = "0031-9015",

publisher = "Physical Society of Japan",

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TY - JOUR

T1 - Stabilization and Destabilization of Sawtooth Oscillations by Lower Hybrid Current Drive in the WT-3 Tokamak

AU - Iida, Motomi

AU - Maekawa, Takashi

AU - Tanaka, Hitoshi

AU - Ide, Shunsuke

AU - Ogura, Kazuo

AU - Hanada, Kazuaki

AU - Iwamasa, Mikito

AU - Itoh, Takehiko

AU - Terumichi, Yasushi

AU - Tanaka, Shigetoshi

PY - 1988

Y1 - 1988

N2 - Sawtooth oscillations appearing in Ohmically heated (OH) plasmas are suppressed by the lower hybrid current drive (LHCD) in the WT-3 tokamak (R = 65 cm, a = 20 cm, Ip ≃ 100 kA, ne = 1 – 2 × 1013 cm–3, qa ≃ 4.5, and PLH ≳ 100 kW). After the suppression, sawteeth reappear following m = 1 oscillations in the LHCD plasmas. The latter sawteeth have a large amplitude and long period (Ts = 2–5 msec), compared with the former one (Ts = 0.5–1.5 msec). Furthermore, they do not accompany a precursor and crash very fast.

AB - Sawtooth oscillations appearing in Ohmically heated (OH) plasmas are suppressed by the lower hybrid current drive (LHCD) in the WT-3 tokamak (R = 65 cm, a = 20 cm, Ip ≃ 100 kA, ne = 1 – 2 × 1013 cm–3, qa ≃ 4.5, and PLH ≳ 100 kW). After the suppression, sawteeth reappear following m = 1 oscillations in the LHCD plasmas. The latter sawteeth have a large amplitude and long period (Ts = 2–5 msec), compared with the former one (Ts = 0.5–1.5 msec). Furthermore, they do not accompany a precursor and crash very fast.

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JF - Journal of the Physical Society of Japan

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Stabilization and Destabilization of Sawtooth Oscillations by Lower Hybrid Current Drive in the WT-3 Tokamak

Abstract

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