Steady-State Currents Driven by Collisionally Damped Lower-Hybrid Waves

McWilliams, R.; Valeo, E. J.; Motley, R. W.; Hooke, W. M.; Olson, Lynn

doi:10.1103/physrevlett.44.245

Cited by 29 publications

(17 citation statements)

References 16 publications

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“…week ending 7 JUNE 2013 0031-9007=13=110(23)=235002(5) 235002-1 Ó 2013 American Physical Society current drive by transferring momentum to the plasma via electron Landau damping with a peak parallel wave refractive index of $2:1, and can achieve long-pulse H-mode operations with or without additional ion cyclotron resonance heating (ICRH). However, similar to other experiments [11,12], significant LHW power can be lost at the plasma edge, especially in a high-density plasma, due to a complex problem of coupling between fast waves and plasma particles. The influence of LHW on the characteristics of ELMs has been studied through the modulation of LHW power in an ICRH-dominated H-mode plasma as shown in Fig.…”

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confidence: 77%

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Magnetic Topology Changes Induced by Lower Hybrid Waves and their Profound Effect on Edge-Localized Modes in the EAST Tokamak

Liang¹,

Gong²,

Gan³

et al. 2013

Phys. Rev. Lett.

120

151

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Strong mitigation of edge-localized modes has been observed on Experimental Advanced Superconducting Tokamak, when lower hybrid waves (LHWs) are applied to H-mode plasmas with ion cyclotron resonant heating. This has been demonstrated to be due to the formation of helical current filaments flowing along field lines in the scrape-off layer induced by LHW. This leads to the splitting of the outer divertor strike points during LHWs similar to previous observations with resonant magnetic perturbations. The change in the magnetic topology has been qualitatively modeled by considering helical current filaments in a field-line-tracing code.

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supporting

confidence: 77%

“…It is to be mentioned that the currents in the SOL induced by LHW have been observed on several devices [11,12], however, the physical mechanism is still unclear. On Alcator C-Mod, the direction of the currents in the SOL did not change when the direction of LHW injection was reversed [11].…”

mentioning

confidence: 99%

Magnetic Topology Changes Induced by Lower Hybrid Waves and their Profound Effect on Edge-Localized Modes in the EAST Tokamak

Liang¹,

Gong²,

Gan³

et al. 2013

Phys. Rev. Lett.

120

151

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confidence: 94%

Energy Distribution of Field Emitted Charged Particles during Beam Propagation

Cho

Kim²,

Choi³

et al. 1998

Jpn. J. Appl. Phys.

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measurements of convective-cell structures in the Proto-Cleo stellarator were not conclusive [6]. In this paper, we compare cross-field and tangential plasma injection in the Proto-Cleo stellarator to demonstrate the role of injection in convective-cell formation. The results show that a significant improvement in confinement occurs with tangential plasma injection.ABSTRACT. Gun injection of plasma parallel to the magnetic field in the Proto-Cleo stellarator results in particle confinement times of 3.5 -4 ms while injection of plasma perpendicular to the magnetic field results in confinement times of 1.5 -2 ms. Calculations of confinement times based on convective-cell theory that includes shear show good agreement with experimentally measured values.

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“…For reactor application, electron*and ion heating are equally applicable since the strong electron-ion energy coupling will ensureT e = T i} regardless to which species the wave power is originally coupled. Recent experiments have investigated the possibility that the tokamak current could be driven steady-state by the Landau damping of travelling lower hybrid waves [10][11][12][13].…”

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confidence: 99%