Long-pulse power-supply system for EAST neutral-beam injectors

Abstract

The long-pulse power-supply system equipped for the 4 MW beam-power ion source is comprised of three units at ASIPP (Institute of Plasma Physics, Chinese Academy of Sciences): one for the neutralbeam test stand and two for the EAST neutral-beam injectors (NBI-1 and NBI-2, respectively). Each power supply system consists of two low voltage and high current DC power supplies for plasma generation of the ion source, and two high voltage and high current DC power supplies for the accelerator grid system. The operation range of the NB power supply is about 80 percent of the design value, which is the safe and stable operation range. At the neutral-beam test stand, a hydrogen ion beam with a beam pulse of 150 s, beam power of 1.5 MW and beam energy of 50 keV was achieved during the long-pulse testing experiments. The result shows that the power-supply system meets the requirements of the EAST-NBIs fully and lays a basis for achieving plasma heating.

Experiment and simulation of ELM in NBI heated plasma on EAST tokamak

“…The EAST is a medium size (major radius R = 1.85 m and minor radius a = 0.45 m) fully superconducting tokamak which aims at steady-state operation. The EAST tokamak has two NBI systems (each consist of two ion sources) with a maximum power of 8 MW (4 × 2 MW) [14,15]. As shown in figure 1(a), one of the NBI systems is a co-tangential unit at A port (named 'Co-NBI') and the another one is a countertangential unit at F port (named 'Ctr-NBI'), they can provide toroidal momentum injection along/against the direction of the plasma current respectively.…”

Design and preliminary results of beam re-turn on of high power ion source

“…The circuit connection of power supplies for the ion source is shown in figure 2 [18]. A filament power supply (DC 20 V@ 5.5 kA) and an arc power supply (DC 176 V@ 2 kA) are applied for the plasma generation.…”

Design and Test of Control System of RF Ion Source Test Platform Based on Industrial PLC

“…The test platform consists of a radio frequency ion source and its supporting systems. The supporting systems include a vacuum chamber, a power supply system, an auxiliary pumping system, a gas supply unit, and a control system [2]. As an important part of the ion source performance test platform, the control system needs to keep each system stable and orderly, to provide an important guarantee for the smooth development of the experiment.…”