The Role of the Plasma Current in Turbulence Decrease with Lower Hybrid Waves

The generation of lower-hybrid waves in an inhomogeneous electron beam is examined. Wave amplitudes are invariably limited by the convective nature of the instability. The self-consistent shear of the magnetic-field geometry due to the beam current is limited to the role of dividing the general problem into separate cases according to the relative orientation of the wave vector and direction of inhomogeneity. Moreover, the limiting case of small shear is smoothly connected to the case where shear is altogether negligible. Estimates of the amplification of lower-hybrid waves propagating across the electron beam are made for the various cases.

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Plasma current ramp-up and Ohmic-heating transformer recharging experiments using lower-hybrid waves on a tokamak

The Physics of Fluids ◽

10.1063/1.866316 ◽

1987 ◽

Vol 30 (4) ◽

pp. 1169 ◽

Cited By ~ 42

Author(s):

Y. Takase ◽

S. Knowlton ◽

M. Porkolab

Keyword(s):

Ohmic Heating ◽

Lower Hybrid ◽

Plasma Current ◽

Current Ramp ◽

Hybrid Waves ◽

Lower Hybrid Waves

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Generation of suprathermal electrons during plasma current startup by lower hybrid waves in a tokamak

Nuclear Fusion ◽

10.1088/0029-5515/25/6/009 ◽

1985 ◽

Vol 25 (6) ◽

pp. 732-736 ◽

Cited By ~ 8

Author(s):

K. Ohkubo ◽

K. Toi ◽

K. Kawahata ◽

Y. Kawasumi ◽

K. Matsumoto ◽

...

Keyword(s):

Lower Hybrid ◽

Plasma Current ◽

Suprathermal Electrons ◽

Hybrid Waves ◽

Lower Hybrid Waves

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Radial Distribution of the Plasma Current Driven by Lower-Hybrid Waves in the JFT-2M Tokamak

Journal of the Physical Society of Japan ◽

10.1143/jpsj.56.1348 ◽

1987 ◽

Vol 56 (4) ◽

pp. 1348-1353 ◽

Cited By ~ 2

Author(s):

Hisato Kawashima ◽

Tohru Matoba ◽

Yoshihiko Uesugi ◽

Katsumichi Hoshino ◽

Takumi Yamamoto

Keyword(s):

Radial Distribution ◽

Lower Hybrid ◽

Plasma Current ◽

Hybrid Waves ◽

Lower Hybrid Waves

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Correlation between the onset of parametric instability of lower hybrid waves and modification in edge plasma current profile on EAST

Nuclear Fusion ◽

10.1088/1741-4326/aae027 ◽

2018 ◽

Vol 58 (12) ◽

pp. 126015 ◽

Cited By ~ 1

Author(s):

B.J. Ding ◽

M.H. Li ◽

Y.C. Li ◽

R. Cesario ◽

A.A. Tuccillo ◽

...

Keyword(s):

Parametric Instability ◽

Edge Plasma ◽

Lower Hybrid ◽

Plasma Current ◽

Current Profile ◽

Hybrid Waves ◽

Lower Hybrid Waves

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Chaos in Magnetoplasmas

Nonlinear Processes in Geophysics ◽

10.5194/npg-6-129-1999 ◽

1999 ◽

Vol 6 (3/4) ◽

pp. 129-143 ◽

Cited By ~ 4

Author(s):

B. Buti

Keyword(s):

Heavy Ions ◽

Nonlinear Dynamical Systems ◽

Nonlinear Dynamical System ◽

Alfven Waves ◽

Alfvén Waves ◽

Lower Hybrid ◽

Nonlinear Dynamical ◽

Hybrid Waves ◽

Lower Hybrid Waves

Abstract. A nonlinear wave, in general, is equivalent to a nonlinear dynamical system, which exhibits the phenomena of chaos. By means of techniques of nonlinear dynamical systems, we have investigated the conditions under which nonlinear Alfvén waves and lower-hybrid waves can become chaotic. The role of heavy ions, in controlling the chaos in magnetoplasmas, is examined. Chaotic routes to Alfvénic turbulence, with k-1 spectra, are observed in case of externally driven nonlinear Alfvén waves. Anomalous heating and particle acceleration resulting from chaotic fields, generated by lower-hybrid waves, are briefly outlined.

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