scholarly journals Off-Axis Current Drive with Helicon Waves for CFETR

2021 ◽  
Author(s):  
Yuqing Yang ◽  
Xinjun Zhang ◽  
Yanping Zhao ◽  
Chengming Qin
Keyword(s):  
Travelling Wave ◽  
Current Drive ◽  
Index Of Refraction ◽  
Fast Wave ◽  
Current Profile ◽  
Plasma Parameters ◽  
High Order Harmonic ◽  
Helicon Wave ◽  
Accessibility Issues ◽  
Helicon Waves

AbstractOff-axis current drive is necessary for Tokamak to maintain and regulate the current profile. Helicon wave is the high order harmonic fast wave and helicon wave current drive (HCD) is one of the key issues in the China Fusion Engineering Test Reactor (CFETR). The theory of HCD is briefly introduced and the simulation results are listed. Helicon waves can realize off-axis current drive under CFETR plasma parameters when the frequency is greater than 1 GHz and drive current is insensitive to the launched value of the parallel index of refraction n||, so wave accessibility issues can be reduced. Travelling Wave Antenna was analyzed by the commercial software package-CST. Near the resonant frequency of the antenna, the Voltage Standing Wave Ratio < 1.2 is obtained for the antenna in the bandwidth of 50 MHz, which means that the antenna does not require a matching system.

scholarly journals Current profile evolution during fast wave current drive on the DIII-D tokamak

1996 ◽  
Author(s):  
C. C. Petty ◽  
C. B. Forest ◽  
F. W. Baity ◽  
S. C. Chiu ◽  
J. S. deGrassie ◽  
...  
Keyword(s):  
Current Drive ◽  
Fast Wave ◽  
Current Profile

Helicon waves in a cylindrical plasma column

1994 ◽  
Vol 52 (3) ◽  
pp. 465-470 ◽  
Author(s):  
M. Shoucri
Keyword(s):  
Plasma Column ◽  
Body Wave ◽  
Low Frequency ◽  
Transverse Magnetic ◽  
Current Drive ◽  
Cylindrical Plasma ◽  
Helicon Wave ◽  
Collisional Damping ◽  
Helicon Waves ◽  
Cylindrical Plasma Column

Helicon waves have been used for efficiently coupling radio-frequency power to plasmas, and are studied for their potential application for low-frequency current drive in tokamks. In this paper the electromagnetic field components and the dispersion relation for azimuthally independent helicon-wave oscillations in a cylindrical plasma column are derived. The coupling of transverse electric TE and transverse magnetic TM modes associated with these oscillations is discussed. The effect of the collisional damping on determining the nature of the TM mode (either surface wave or body wave) is analysed.

Fast wave current drive

1985 ◽  
Author(s):  
J. Goree ◽  
M. Ono ◽  
P. Colestock ◽  
R. Horton ◽  
D. McNeill ◽  
...  
Keyword(s):  
Current Drive ◽  
Fast Wave

scholarly journals Modeling of Fast Wave Current Drive Experiments on DIII-D

1992 ◽  
Author(s):  
T. C. Luce ◽  
S. C. Chiu ◽  
R. W. Harvey ◽  
M. J. Mayberry ◽  
C. C. Petty ◽  
...  
Keyword(s):  
Current Drive ◽  
Fast Wave

Self-consistent quasi-linear calculations for fast-wave current drive

1989 ◽  
Vol 104 (3) ◽  
pp. 263-272 ◽  
Author(s):  
Altair S. De Assis ◽  
J. Busnardo-Neto
Keyword(s):  
Current Drive ◽  
Fast Wave ◽  
Self Consistent

Numerical simulation of current profile flattening during lower hybrid current drive in JT-60

1990 ◽  
Vol 30 (4) ◽  
pp. 771-775 ◽  
Author(s):  
R. Yoshino ◽  
K. Ushigusa ◽  
T. Imai ◽  
H. Shirai ◽  
K. Shimizu
Keyword(s):  
Numerical Simulation ◽  
Current Drive ◽  
Lower Hybrid ◽  
Current Profile ◽  
Lower Hybrid Current Drive

Resonant wave-filament interactions as a loss mechanism for HHFW heating and current drive

2021 ◽  
Author(s):  
Wouter Tierens ◽  
James R Myra ◽  
Roberto Bilato ◽  
Laurent Colas
Keyword(s):  
Surface Wave ◽  
Surface Waves ◽  
High Harmonic ◽  
Current Drive ◽  
Fast Wave ◽  
Power Losses ◽  
Loss Mechanism ◽  
Resonant Wave ◽  
Plasma Filaments ◽  
Analytic Expression

Abstract Perkins et al. PRL 2012 [1] reported unexpected power losses during High Harmonic Fast Wave (HHFW) heating and current drive in NSTX. Recently, Tierens et al [2] proposed that these losses may be attributable to surface waves on field-aligned plasma filaments, which carry power along the filaments, to be lost at the endpoints where the filaments intersect the limiters. In this work, we show that there is indeed a resonant loss mechanism associated with the excitation of these surface waves, and derive an analytic expression for the power lost to surface wave modes at each filament.

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