Title :
Operational performance of the two channel 10 Megawatt feedback amplifier system for MHD control on the Columbia University HBT-EP tokamak
Author :
Reass, W.A. ; Wurden, G.A. ; Nadle, D.L. ; Mauel, M.E. ; Navratil, G.A.
Author_Institution :
Los Alamos Nat. Lab., NM, USA
Abstract :
The operational characteristics and performance of the two channel 10 Megawatt MHD feedback control system as installed by Los Alamos National Laboratory on the Columbia University HBT-EP tokamak are described. In the present configuration, driving independent 300 uH saddle coil sets, each channel can deliver 1100 Amperes and 16 kV peak to peak. Full power bandwidth is about 12 kHz, with capabilities at reduced power to 30 MHz. The present system topology is designed to suppress magnetohydrodynamic activity with m=2, n=1 symmetry. Application of either static (single phase) or rotating (twin phased) magnetic perturbations shows the ability to spin up or slow down the plasma, and also prevent (or cause) so-called “mode-locking”. Open loop and active feedback experiments using a digital signal processor (DSP) have been performed on the HBT-EP tokamak and initial results show the ability to manipulate the plasma MHD mode frequency
Keywords :
feedback amplifiers; fusion reactor design; fusion reactor operation; plasma instability; plasma magnetohydrodynamics; plasma toroidal confinement; 10 MW; 1100 A; 12 kHz; 16 kV; 30 kHz; Columbia University HBT-EP tokamak; MHD control; fusion reactors; mode-locking; operational performance; plasma MHD mode frequency; saddle coil sets; two channel feedback amplifier; Bandwidth; Coils; Digital signal processors; Feedback control; Feedback loop; Laboratories; Magnetohydrodynamic power generation; Plasma applications; Tokamaks; Topology;
Conference_Titel :
Fusion Engineering, 1997. 17th IEEE/NPSS Symposium
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-4226-7
DOI :
10.1109/FUSION.1997.687087
