Plasma behavior with a separatrix magnetic surface in JFT−2a tokamak

Shimomura, Y.; Maeda, Hideaki; Ohtsuka, Hokuto; Kitsunezaki, A.; Nagashima, Takashi; Yamamoto, Satoshi; Kimura, Hiroyuki; Nagami, M.; Ueda, N.; Funahashi, A.; Matoba, T.; Kasai, S.; Takeuchi, Hiroshi; Takahashi, Koki; Kumagai, K.; Tokutake, T.; Anno, K.; Arai, Toshihiko

doi:10.1063/1.861335

Cited by 32 publications

(17 citation statements)

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“…This paper describes an experimental study on the thermal interaction between plasma and walls in the divertor tokamak, DIVA [1][2][3][4][5]. The other interactions relevant to the release of the metal impurity, such as ion sputtering and arcing, are discussed in Ref.…”

Section: Introductionmentioning

confidence: 99%

Heat flux to the material surfaces in a tokamak

Kimura¹,

Maeda²,

Ueda³

et al. 1978

Nucl. Fusion

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Section: Introductionmentioning

confidence: 99%

Heat flux to the material surfaces in a tokamak

Kimura¹,

Maeda²,

Ueda³

et al. 1978

Nucl. Fusion

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“…The influence of E × B drift in ESN plasmas was demonstrated to be the determinant cause of the heat flux asymmetries observed on the DIVA machine (JFT-2a [7]). When the machine was operated in its nominal field and current directions, thermocouple measurements showed a preferential heating of the top divertor plate.…”

Section: The E × B and Diamagnetic Driftsmentioning

confidence: 98%

“…Indeed, it is one of only two tokamaks to ever have had an X point on the high field side (HFS) of the midplane, the other being the DIVA experiment on the JFT-2a machine [7], no longer in operation. This set-up makes it possible to design discharges where both divertor legs are magnetically and topologically identical.…”

Section: Introductionmentioning

confidence: 99%

Continuous-wave laser utilizingF₂⁺:O^2–color centers in an NaCl:OH crystal tunable in the 1.42–1.78 μm range

Matts¹,

Pestryakov²,

Kolyago³

et al. 1990

Sov. J. Quantum Electron.

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In equatorial single null diverted discharges in TEXT-Upgrade, up-down asymmetries have been noted, the sign and magnitude of which depend on plasma conditions such as electron density and X point position. Geometrical effects do not play a role in these plasmas, which are topologically up-down symmetric, so the asymmetry must come from physical driving mechanisms. Several such mechanisms will be investigated, both computationally and experimentally, and compared with data from tokamak discharges. An analysis is included of the E × B, diamagnetic and rT × B drifts as well as plasma rotation. The B2-EIRENE plasma simulation code is used to evaluate the respective influences of the rT × B driving terms. Scans of the X point position relative to the divertor plates and of the electron density are performed. The X point is brought in all the way to the divertor plates so as to assess the importance of the private region in the drift flow patterns and to break the flow loops. The low recycling regime typical of TEXT-Upgrade single null plasmas allows separation and identification of the influence of individual flows. It is concluded that E × B drift is the dominant effect and that it qualitatively explains the reported behaviour. * Current affiliation: Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA. the ∇T ×B associated flows. Mathematically, E ×B drift motion can be expressed as v E = E × B/B 2 . The diamagnetic velocity is

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“…After identifying a grossly stable plasma enclosed within a separatrix magnetic surface and evaluating the basic characteristics of the plasma [9], the experiment demonstrated that a poloidal divertor is effective in reducing impurities in the plasma, mostly metallic ones in JFT-2a/DIVA whose first wall was covered with a gold film. It was found that the reduction of impurities went together with a definite improvement of the energy confinement time [10].…”

Section: Jft-2/diva Experimentsmentioning

confidence: 99%