Title :
Plasma position control experiments on a tokamak with force-balanced coils
Author :
Komatsu, Y. ; Nomura, J. ; Shimada, K. ; Tsoji-Iio, S. ; Shimada, R.
Author_Institution :
Res. Lab. for Nucl. Reactors, Tokyo Inst. of Technol., Japan
Abstract :
The force-balanced coils (FBCs) which can drastically reduce the vital centering force, have been proposed for tokamak coil systems. “TODOROKI-1” is the small pulsed tokamak device with FBCs. The plasma current reached 10 kA and the pulse duration was 0.7 ms with a two-step FBC excitation scheme. The electron temperature was about 50 eV and the electron density was 2×1019 m3. The plasma displacement has been evaluated through approximating the plasma current by six filaments, and the inward shift in the later phase of the discharge was found. A next device´s concept to demonstrate better plasma position control with optimized FBCs and vertical field coils and the winding modulation of FBCs are being formed. The FBCs are composed of some segmented coils that can simplify the maintenance of the device
Keywords :
fusion reactor design; fusion reactor operation; nuclear reactor maintenance; physical instrumentation control; plasma temperature; plasma toroidal confinement; position control; 0.7 ms; 10 kA; 50 eV; TODOROKI-1; centering force; electron temperature; force-balanced coils; fusion reactors; maintenance; plasma displacement; plasma position control; pulsed tokamak device; segmented coils; tokamak; two-step FBC excitation scheme; vertical field coils; winding modulation; Coils; Plasma confinement; Plasma density; Plasma devices; Plasma properties; Plasma temperature; Plasma waves; Position control; Tokamak devices; Toroidal magnetic fields;
Conference_Titel :
Fusion Engineering, 1999. 18th Symposium on
Conference_Location :
Albuquerque, NM
Print_ISBN :
0-7803-5829-5
DOI :
10.1109/FUSION.1999.849904
