Title :
The power supply and control system for the MM-2U neutral beam injector
Author :
Wang, D.T. ; Xu, X.W. ; Li, X.Y. ; Lu, D.L. ; Jiang, S.F. ; Sun, M.D. ; Li, H.J. ; Yuan, B.S. ; Liu, M.Z.
Author_Institution :
SIP, Chengdu, China
Abstract :
A single injector with one ion source has been constructed, which is provided for researching the stability effect of the sloshing ion distribution in the magnetic mirror experiment facility (MM-2U) by oblique injection of neutral beam. The neutral beam injector (NBI) can deliver 80 kW of neutral beam power at energy of 25 keV with 50 ms for MM-2U. In the present paper, a testing power supply for the neutral beam injector with injecting power up to 200 kW is described. A thyristor switch modulator applied to an arc power supply, it is capable of delivering 10 to 1000 A DC pulses at 20 to 100 V and pulse length up to 2 s with a duty cycle of 1/100. Both switching-on and switching off times of the circuit are less than O.5 ms. A high power vacuum tube TM-703F is used as the switch/regulator of the accel power supply, specifications of the circuit are as follows: output pulse voltage 50 kV, pulse current 30 A, pulse width 50 ms. Both the rise and fall times are less than 25 μs, fluctuation of the pulse flat top less than 1%. A programmable controller by a DBJ-Z80 computer is applied to control the sequence of the power supply. The power supply and control system have been operated for 5 years successfully
Keywords :
accelerator control systems; fusion reactor design; fusion reactors; ion sources; magnetic mirrors; nuclear electronics; nuclear engineering computing; particle beam fusion accelerators; plasma beam injection heating; plasma instability; power supplies to apparatus; power system control; programmable controllers; 0.5 s; 10 to 1000 A; 2 s; 20 to 100 V; 200 kW; 25 keV; 25 mus; 30 A; 5 y; 50 kV; 50 ms; 80 kW; MM-2U neutral beam injector; TM-703F; accel power supply; arc power supply; control system; fall times; fusion reactor; high power vacuum tube; ion source; magnetic mirror experiment facility; oblique injection; power supply; programmable controller; pulse flat top; rise times; single injector; sloshing ion distribution; stability effect; switching off times; switching-on times; testing power supply; thyristor switch modulator; Control systems; Ion sources; Power supplies; Pulse circuits; Pulse modulation; Pulsed power supplies; Space vector pulse width modulation; Stability; Switches; Switching circuits;
Conference_Titel :
Fusion Engineering, 1993., 15th IEEE/NPSS Symposium on
Conference_Location :
Hyannis, MA
Print_ISBN :
0-7803-1412-3
DOI :
10.1109/FUSION.1993.518470
