Observation of Parametric Decay of a Pumping Wave in Lower Hybrid Wave Heating and Current Drive Experiments at the FT-2 Tokamak

2019 ◽  
Vol 45 (12) ◽  
pp. 1134-1141 ◽  
Author(s):  
V. V. D’yachenko ◽  
A. N. Konovalov ◽  
A. Yu. Stepanov ◽  
A. B. Altukhov ◽  
E. Z. Gusakov ◽  
...  
Keyword(s):  
Current Drive ◽  
Lower Hybrid ◽  
Hybrid Wave ◽  
Lower Hybrid Wave ◽  
Parametric Decay ◽  
Wave Heating

scholarly journals Parametric decay instabilities of lower hybrid wave current drive on CFETR

2020 ◽  
Author(s):  
T. T. Zhou ◽  
N. Xiang ◽  
J. L. Chen ◽  
C. Y. Gan ◽  
G. Z. Jia
Keyword(s):  
Current Drive ◽  
Lower Hybrid ◽  
Hybrid Wave ◽  
Lower Hybrid Wave ◽  
Parametric Decay

LOWER HYBRID WAVE HEATING OF FTU TOKAMAK

1982 ◽  
pp. 999-1006
Author(s):  
F. Santini ◽  
E. Barbato ◽  
F. Romanelli
Keyword(s):  
Lower Hybrid ◽  
Hybrid Wave ◽  
Lower Hybrid Wave ◽  
Wave Heating

Outline of a theory of lower-hybrid wave absorption

1993 ◽  
Vol 50 (2) ◽  
pp. 251-266
Author(s):  
E. Canobbio ◽  
R. Croci
Keyword(s):  
Homogeneous Magnetic Field ◽  
Current Drive ◽  
Lower Hybrid ◽  
Hybrid Wave ◽  
Lower Hybrid Wave ◽  
Linear Diffusion ◽  
Neighbouring Region ◽  
Nonlinear Relation ◽  
Single Path ◽  
Component Parallel

This paper outlines a theory of absorption of lower-hybrid (LH) waves in an electron plasma that is based on the nonlinear relation between grad │E3│2, where E3 is the electric field component parallel to the external homogeneous magnetic field, and the space dependent quasi-linear diffusion coefficient, and consequently between grad │E3│2 and the absorption. A local absorption induces an increase of the value of the gradient in the neighbouring region and thereby extends the absorption domain. In this way virtually total ‘single-path’ absorption of the injected LH power is obtained. The theory also allows an explanation of the density limit in current drive.

Quasimode decay of a lower-hybrid wave in a two-electron-temperature plasma

1996 ◽  
Vol 56 (2) ◽  
pp. 237-249
Author(s):  
A. Sudarshan ◽  
S. K. Sharma
Keyword(s):  
Growth Rate ◽  
Electron Temperature ◽  
Decay Channel ◽  
Lower Hybrid ◽  
Hybrid Wave ◽  
Lower Hybrid Wave ◽  
Temperature Plasma ◽  
Parametric Decay ◽  
Cylindrical Plasma ◽  
Ion Cyclotron

We study the quasimode decay of a lower-hybrid wave and a damped ion cyclotron wave in a plasma having two kinds of electrons. This decay channel is also investigated for a cylindrical plasma. The behaviour of the threshold and growth rate with variations in Tn/Tc and non/noc are studied, and a comparison is made with previous results. Our results show that the growth rate and the threshold for the onset of parametric decay are influenced by the presence of the second electron species.

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