Influence of magnetic configuration and heating methods on distribution of diverted plasmas in Heliotron E

Mizuuchi, T.; Voitsenya, V.S.; Chechkin, V. V.; Nagasaki, K.; Zushi, H.; Nakasuga, M.; Okada, H.; Besshou, S.; Hayakawa, A.; Funaba, H.; Hamada, T.; Masuzaki, S.; Kondo, K.; Sano, F.; Motojima, O.; Pavlichenko, O. S.; Obiki, T.

doi:10.1016/s0022-3115(98)00686-2

Cited by 12 publications

(27 citation statements)

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“…This shift well correlated with that of calculated locations of the longest open magnetic field lines crossing the collectors [13] (with the second ends crossing the vessel wall), similar to what was observed in practically all other cases of DPF measurements in Heliotron-E [1,[3][4][5].…”

Section: Effect Of Magnetic Configuration On Dpfsupporting

confidence: 86%

“…The spatial distribution of ISC response to an additional heating pulse was characterized by a strong poloidal inhomogeneity [3,4]. Such an inhomogeneity of relative and absolute ISC increments for different CPs in the Y ¼ 315 array can be seen in Figure 2.…”

Section: Time Behavior Of Divertor Flowsmentioning

confidence: 95%

“…[3,4] that the magnitudes of the main components of DPF rose with increase of the total density-normalized heating power absorbed by the plasma, P abs =n e . With this, the increments of this rise were quite different for different collectors.…”

Section: Effect Of Heating Power On Divertor Flowsmentioning

confidence: 98%

“…[1,3,4] for the initial ECH, NBI and NBI þ ECH regimes. By summing ISCs over all the collectors of each array, the poloidal distribution of the total plasma flow, G(Y,t) ¼ SI s (Y,t)=n e (t), can be obtained.…”

Section: Poloidal Distribution Of Divertor Plasma Flowsmentioning

confidence: 99%

“…The divertor plasma flow (DPF) distribution in the Heliotron-E (H-E) device has been already investigated elsewhere [1][2][3][4][5]. In these publications a good qualitative correlation has been found between the DPF distribution and the configuration of open magnetic field lines; dependences of separate divertor flow components on the absorbed power have been studied in detail; a possible explanation has been done of the DPF time behavior when an electron-cyclotron heating pulse was superimposed on the neutral beam heated plasma; a strong vertical asymmetry in DPF distribution has been revealed and its possible explanations have been suggested.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Experimental Conditions on Distribution of Divertor Plasma Flow in the Heliotron-E Fusion Device

Voitsenya¹,

Chechkin²,

Mizuuchi³

et al. 2002

Plasma Devices and Operations

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A comprehensive study of the divertor plasma flow (DPF) distribution in the Heliotron-E helical device has been carried out by means of collector arrays under various experimental conditions. A strong inhomogeneity of DPF distribution is observed in all the investigated regimes. This inhomogeneity is characterized by a significant asymmetry of plasma flows recorded by symmetrically displaced collectors. The degree of asymmetry in horizontal (in-out) and in vertical (up-down) directions depends on characteristics of magnetic configuration as well as on experimental conditions: method of plasma heating, injected power and power absorbed by the plasma, plasma density, gas puffing time, pellet injection, etc. A certain degree of asymmetry also remains after termination of the active phase of discharge, i.e., at the stage of decaying plasma. By comparison of asymmetry indices at the active stages of discharge and at the stage of afterglow plasma, the contribution of trapped particles into the asymmetry of DPF distribution has been estimated.

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Section: Effect Of Magnetic Configuration On Dpfsupporting

confidence: 86%

Section: Time Behavior Of Divertor Flowsmentioning

confidence: 95%

Section: Effect Of Heating Power On Divertor Flowsmentioning

confidence: 98%

Section: Poloidal Distribution Of Divertor Plasma Flowsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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