Compact Helical System Physics and Engineering Design

Nishimura, K.; Matsuoka, K.; Fujiwara, Masami; Yamazaki, K.; Todoroki, Jiro; Kamimura, Tomohiko; Amano, Tsuneo; Sanuki, H.; Okamura, S.; Hosokawa, M.; Yamada, H.; Tanahashi, S.; Kubo, S.; Takita, Y.; Shoji, T.; Kaneko, O.; Iguchi, H.; Takahashi, C.

doi:10.13182/fst90-a29173

Cited by 95 publications

(39 citation statements)

References 7 publications

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“…The Compact Helical System (CHS) project [1] since June 1988 came to a close at the end of August 2006. The CHS was a medium-sized helical device having a major radius R of 1 m and averaged plasma minor radius a p of ∼0.2 m and was characterized by its low aspect ratio.…”

Section: Introductionmentioning

confidence: 99%

Fast-Ion-Diagnostics for CHS Experiment

Isobe

Okamura

Nagaoka

et al. 2007

Plasma and Fusion Research

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Section: Introductionmentioning

confidence: 99%

Fast-Ion-Diagnostics for CHS Experiment

Isobe

Okamura

Nagaoka

et al. 2007

Plasma and Fusion Research

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“…In addition, toroidal magnetic surfaces inherently possess a magnetic shear that would short-circuit such electrostatic modes as the diocotron mode [5] and stabilize them. However, experiments on the Compact Helical System (CHS) machine [6] have shown that the nonneutral plasma confined on magnetic surfaces does not seem to be the case; the plasma exhibits disruption.…”

Section: Introductionmentioning

confidence: 99%

Electron Current Measurement of Helical Nonneutral Plasmas for Investigating Plasma Disruption Observed in CHS Experiments

Himura

Yamamoto

Sanpei

et al. 2007

Plasma and Fusion Research

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A nonneutral plasma confined on helical magnetic surfaces exhibits instability, although it is theoretically stable. In order to investigate the disruptive phenomenon in detail, electron particle flow into a probe tip is carefully measured inside the magnetic surfaces. Preliminary results indicate that the observed disruption is first to occur near the top of the plasma, and then, seems to propagate toward the center of the plasma.

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“…It should be noted that the lowest-aspect-ratio stellarators ever built, the Compact Helical System (CHS) [7], the Compact Auburn Torsatron (CAT) [8], and heliac H-1 [9], have A ≈ 5. In the SS concept, the plasma aspect ratio is much lower, usually about, or sometimes significantly below A = 3.5; also, the use of modular coils in a SS represents a significant advantage for reactor applications where the possibility of replacing any particular part of a device has to be maintained.…”

Section: Introductionmentioning

confidence: 99%

Low-aspect-ratio stellarators with planar coils

Moroz¹

1997

Plasma Phys. Control. Fusion

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Abstract. The possibility of using simple sets of planar coils to produce low-aspect-ratio stellarator (LARS) configurations is analysed. Various types of LARS with different planar coils of potential interest to fusion research are identified. It is found that these configurations possess rather attractive features including: compact design and coil simplicity; good access to the plasma; closed vacuum flux surfaces with large enclosed volume; a significant external rotational transform; strong magnetic well; and a natural divertor. Finite plasma-pressure and finite plasma-current effects are studied as well, and it is shown that the LARS configurations considered benefit from the plasma current.

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Compact Helical System Physics and Engineering Design

Cited by 95 publications

References 7 publications

Fast-Ion-Diagnostics for CHS Experiment

Fast-Ion-Diagnostics for CHS Experiment

Electron Current Measurement of Helical Nonneutral Plasmas for Investigating Plasma Disruption Observed in CHS Experiments

Low-aspect-ratio stellarators with planar coils

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