Current Sustainment by Lower Hybrid Waves in the WT-2 Tokamak

Masahiko Nakamura, Teruji Cho, Shin Kubo, Takashi Shimozuma, Akira Ando, Kazuo Ogura, Takashi Maekawa, Yasushi Terumichi, Shigetoshi Tanaka

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


When RF power PLHH near the lower hybrid frequency is injected into the ohmically heated plasma in the WT-2 tokamak, the RF-driven current is generated (Irf~-12 kA) and the plasma (ne~-3 x 1012 cm-3)is sustained by this current without ohmic current during the injection of PLhh- The efficiency ofRF current drive is obtained as ITf=0.06PWH/ne R (kA, kW, 1013 cm-3, m),where R is the major radius. The current 7rf is carried by suprathermal electrons which interact resonantly with lower hybrid waves. A high frequency instability and associated relaxation oscillation are observed, which can be suppressed by a simultaneous injection of the electron cyclotron heating power.

Original languageEnglish
Pages (from-to)3399-3407
Number of pages9
JournalJournal of the Physical Society of Japan
Issue number10
Publication statusPublished - 1984


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