Lower hybrid wave heating in the Octopole tokamak

Stambaugh, R.D.; Armentrout, C.J.; Harvey, R. W.; Haye, R.J. La; Ohkawa, T.; Petersen, P.I.; Gomay, Y.

doi:10.1088/0029-5515/22/2/005

Cited by 3 publications

(2 citation statements)

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“…These phenomena are quite similar to the results of particle simulations [20][21][22]. If we take into account surface electron heating, the problem concerning the energy flow [5] can be solved. These fast electrons will hit the limiter and the wall because of poor confinement on the plasma surface.…”

Section: Discussionsupporting

confidence: 81%

“…Therefore it is difficult to understand the mechanism of the current drive. Also, there is no explanation of the energy flow in the electron heating experiment of the Octopole Tokamak where a coherent multiwavelength antenna excited a relatively slow LHW [5]. The experiment of our group shows the tail formed in the electron velocity distribution function in a currentdriven phase [16].…”

Section: Introductionmentioning

confidence: 79%

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Experimental studies on current drive by slow lower-hybrid waves

1984

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Very slow lower-hybrid waves travelling unidirectionally with a phase velocity of a few times the electron thermal velocity have been used to drive surface currents in a tokamak plasma. Most of the wave energy is dissipated at the plasma surface by virtue of a strong interaction with the electrons. This leads to electron acceleration up to velocities an order of magnitude greater than the electron thermal velocity. Electron trapping by the wave is discussed as a possible mechanism for surface current generation.

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Section: Discussionsupporting

confidence: 81%

Section: Introductionmentioning

confidence: 79%

Experimental studies on current drive by slow lower-hybrid waves

1984

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Electron behavior during electron cyclotron resonance heating in a stellarator

Trost

Shohet

1989

Physics of Fluids B: Plasma Physics

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Experimental and theoretical studies of the electron energy distribution during electron cyclotron resonant heating of a target plasma in the Interchangeable Module Stellarator (IMS) [IEEE Trans. Plasma Sci. PS-9, 212 (1981)] have been made. The experimental results show an electron energy distribution with a bulk Maxwellian component (f0) with a temperature of 10–25 eV, and a warm component (f1) with an average energy of 140–160 eV. The electron energy distribution is obtained numerically with a particle-following Monte Carlo simulation. To model the electron cyclotron heating interactions with the electrons, an rf collision model based on stochastic electron–wave interactions is used. Results from this simulation are compared to experimental results. The experimental measurements and the calculated distributions agree well, to within experimental error.

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Lower Hybrid Heating and Current Drive: Experimental Results Versus Theoretical Expectations

Wegrowe¹

1985

Fusion Technology

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Lower hybrid wave heating in the Octopole tokamak

Abstract: Electron heating (ΔTe/Te≤30%, Δne/ne≤100%) was produced in tokamak-like discharges (ne = 2 × 1011 cm−3, Te ≅ 15 eV, ) in the General Atomic Octopole by application of lower hybrid wave power. The heating efficiency was 50% for vϕ/vT = 1.7 and 17% for vϕ/vT = 3.4.

Cited by 3 publications

References 18 publications

Experimental studies on current drive by slow lower-hybrid waves

Experimental studies on current drive by slow lower-hybrid waves

Electron behavior during electron cyclotron resonance heating in a stellarator

Lower Hybrid Heating and Current Drive: Experimental Results Versus Theoretical Expectations

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