Recent Progress in Low-A RFP Plasma Research in RELAX

Akio SANPEI; Ryuya IKEZOE; Takumi ONCHI; Kensuke OKI; Masaki SUGIHARA; Yuusuke KONISHI; Shin-ichi FUJITA; Mitsuru NAKAMURA; Akio HIGASHI; Hidehiko MOTOI; Haruhiko HIMURA; Sadao MASAMUNE

doi:10.1585/pfr.5.S2063

Regular Articles

Recent Progress in Low-A RFP Plasma Research in RELAX

Akio SANPEI, Ryuya IKEZOE, Takumi ONCHI, Kensuke OKI, Masaki SUGIHARA, Yuusuke KONISHI, Shin-ichi FUJITA, Mitsuru NAKAMURA, Akio HIGASHI, Hidehiko MOTOI, Haruhiko HIMURA, Sadao MASAMUNE

Author information

Akio SANPEI
Kyoto Institute of Technology, Kyoto 606-8585, Japan
Ryuya IKEZOE
Kyoto Institute of Technology, Kyoto 606-8585, Japan
Takumi ONCHI
Kyoto Institute of Technology, Kyoto 606-8585, Japan
Kensuke OKI
Kyoto Institute of Technology, Kyoto 606-8585, Japan
Masaki SUGIHARA
Kyoto Institute of Technology, Kyoto 606-8585, Japan
Yuusuke KONISHI
Kyoto Institute of Technology, Kyoto 606-8585, Japan
Shin-ichi FUJITA
Kyoto Institute of Technology, Kyoto 606-8585, Japan
Mitsuru NAKAMURA
Kyoto Institute of Technology, Kyoto 606-8585, Japan
Akio HIGASHI
Kyoto Institute of Technology, Kyoto 606-8585, Japan
Hidehiko MOTOI
Kyoto Institute of Technology, Kyoto 606-8585, Japan
Haruhiko HIMURA
Kyoto Institute of Technology, Kyoto 606-8585, Japan
Sadao MASAMUNE
Kyoto Institute of Technology, Kyoto 606-8585, Japan

Keywords: reversed field pinch (RFP), low-aspect ratio (low-A), nonlinear MHD

JOURNAL FREE ACCESS

2010 Volume 5 Pages S2063

DOI https://doi.org/10.1585/pfr.5.S2063

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Abstract

Recent results from a low-aspect-ratio (low-A) reversed field pinch (RFP) machine with an aspect ratio of 2 (R/a = 0.51/0.25) are reported. The discharge characteristics of low-A RFP plasmas are described. The discharge regime in F − Θ space indicates that lowering the aspect ratio expanded the operational F − Θ space to the extremely high-Θ (> 3), deep-reversal (F < −1) region and to the non reversal (F > 0) region. A rotating helical Ohmic equilibrium RFP state could be realized in shallow-reversal discharge on REversed field pinch of Low Aspect eXperiment (RELAX). A preliminary feedback system is developed that results in plasma current with a longer discharge duration of ∼2 ms.

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