Production of sheared flow during ion cyclotron resonance heating in tokamak plasmas

1997 ◽  
Vol 4 (8) ◽  
pp. 2788-2790 ◽  
Author(s):  
C. G. Liu ◽  
M. Yamagiwa ◽  
S. J. Qian
Keyword(s):  
Cyclotron Resonance ◽  
Ion Cyclotron Resonance ◽  
Tokamak Plasmas ◽  
Sheared Flow ◽  
Ion Cyclotron

scholarly journals The merits of ion cyclotron resonance heating schemes for sawtooth control in tokamak plasmas

2015 ◽  
Vol 81 (6) ◽  
Author(s):  
I. T. Chapman ◽  
J. P. Graves ◽  
M. Lennholm ◽  
J. Faustin ◽  
E. Lerche ◽  
...  
Keyword(s):  
Cyclotron Resonance ◽  
Antenna Design ◽  
Ion Cyclotron Resonance ◽  
Tokamak Plasmas ◽  
Real Time Control ◽  
Resonance Position ◽  
Time Control ◽  
Low Field ◽  
Ion Cyclotron ◽  
Wall Interaction

JET experiments have compared the efficacy of low- and high-field side ion cyclotron resonance heating (ICRH) as an actuator to deliberately minimise the sawtooth period. It is found that low-field side ICRH with low minority concentration is optimal for sawtooth control for two main reasons. Firstly, low-field side heating means that any toroidal phasing of the ICRH ($-90^{\circ }$, $+90^{\circ }$ or dipole) has a destabilising effect on the sawteeth, meaning that dipole phasing can be employed, since this is preferable due to less plasma wall interaction from Resonant Frequency (RF) sheaths. Secondly, the resonance position of the low-field side ICRH does not have to be very accurately placed to achieve sawtooth control, relaxing the requirement for real-time control of the RF frequency. These empirical observations have been confirmed by hybrid kinetic–magnetohydrodynamic modelling, and suggest that the ICRH antenna design for ITER is well positioned to provide a control actuator capable of having a significant effect on the sawtooth behaviour.

scholarly journals Quasilinear evolution of non-thermal distributions in ion cyclotron resonance heating of tokamak plasmas

2006 ◽  
Vol 46 ◽  
pp. 82-86 ◽  
Author(s):  
E F Jaeger ◽  
R W Harvey ◽  
V E Lynch ◽  
N Ershov ◽  
L A Berry ◽  
...  
Keyword(s):  
Cyclotron Resonance ◽  
Ion Cyclotron Resonance ◽  
Tokamak Plasmas ◽  
Ion Cyclotron
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