Response to “Comment on ‘Magnetohydrodynamic simulations of direct current helicity injection for current drive in tokamaks’ ’’ [Phys. Plasmas 3, 1038 (1996)]

1997 ◽  
Vol 4 (2) ◽  
pp. 503-504 ◽  
Author(s):  
C. R. Sovinec ◽  
S. C. Prager
Keyword(s):  
Direct Current ◽  
Current Drive ◽  
Helicity Injection ◽  
Magnetohydrodynamic Simulations ◽  
Current Helicity

scholarly journals Initiation and sustainment of tokamak plasmas with local helicity injection as the majority current drive

2018 ◽  
Vol 58 (9) ◽  
pp. 096002 ◽  
Author(s):  
J.M. Perry ◽  
G.M. Bodner ◽  
M.W. Bongard ◽  
M.G. Burke ◽  
R.J. Fonck ◽  
...  
Keyword(s):  
Current Drive ◽  
Tokamak Plasmas ◽  
Helicity Injection

Design of Observer for Direct Current Drive

2009 ◽  
Vol 147-149 ◽  
pp. 119-124
Author(s):  
Andrius Petrovas ◽  
Roma Rinkeviciene ◽  
Saulius Lisauskas
Keyword(s):  
Mathematical Model ◽  
Control Theory ◽  
State Space ◽  
Characteristic Equation ◽  
Direct Current ◽  
Angular Speed ◽  
Current Drive

Control theory proposes to apply observers in systems with uncertain plant parameters. Observers can be used for calculation of feedback gains and getting desired, even strictly determined response requirements. The paper considers design of controller for direct current drive. As state space variables are chosen armature current and angular speed of motor. Mathematical model of the motor, operating with load which is assumed as disturbance, is elaborated. Full order Luenberg observer is designed according to desired characteristic equation of system. The results of simulation are presented and discussed.

RF current drive with magnetic helicity injection

1985 ◽  
Vol 33 (2) ◽  
pp. 257-264 ◽  
Author(s):  
D. K. Bhadra ◽  
C. Chu
Keyword(s):  
Steady State ◽  
Plasma Density ◽  
Electromagnetic Waves ◽  
Current Drive ◽  
Magnetic Helicity ◽  
Finite Frequency ◽  
Helicity Injection ◽  
Steady State Current ◽  
External Injection ◽  
Frequency Current

External injection of magnetic helicity into a plasma may be possible through the introduction of appropriately polarized electromagnetic waves. A concept of steady-state current-drive is presented, based on the validity of conservation of helicity (appropriately defined for finite frequency processes). It is shown that such external injection of helicity can maintain a steady-state current by compensating the volt-seconds consumed through plasma resistivity. Such a mechanism, if experimentally successful, is particularly interesting at high densities because the efficiency of the process does not depend on plasma density, as opposed to other radio-frequency current-drive techniques.

Low Aspect Ratio Tokamak Formation and Sustainment by Coaxial Helicity Injection Current Drive

1995 ◽  
Vol 27 (3T) ◽  
pp. 333-336
Author(s):  
B. A. Nelson ◽  
T. R. Jarboe ◽  
D. J. Orvis ◽  
A. K. Martin ◽  
J. Xie ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Current Drive ◽  
Injection Current ◽  
Helicity Injection ◽  
Low Aspect Ratio ◽  
Coaxial Helicity Injection
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