R&D progress of high power ion source on EAST-NBI

Abstract

The neutral beam injector (NBI) system was designed and developed mainly for the plasma heating on the Experimental Advanced Superconducting Tokamak (EAST). The high power ion source is the key part of the NBI. A hot cathode ion source was used on the EAST-NBI. The ion source was conditioned on the ion source test bed with hydrogen gas and achieved the designed parameters. The deuterium gas was used when it moved to the EAST-NBI. The main performance of the ion source on EAST is presented in this paper. The highest beam power of 4.5 MW in NBI-1 and 2.75 MW in NBI-2 was achieved. The total neutral beam power is about 4.5 MW. The long pulse beam of 100 s is injected into the EAST plasma too.

Key issues for the filament-arc ion source of EAST neutral beam injector toward high-power and long-pulse operation

“…The EAST ion source for neutral beam injection consists mainly of two parts: a filament-arc driven plasma generator and a tetrode accelerator (shown in figure 2) [19][20][21]. The EAST ion source is based on the common long pulse source (CLPS) developed for the DIII-D neutral beam injectors.…”

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

“…A bucket-type ion source with hot filament cathode was employed on EAST-NBI, the schematic diagram of ion source is presented in figure 1. The design and performance of ion source was reported before [11][12][13][14]. It consists of a bucket plasma source and a tetrode accelerator with slot-type grids [15,16].…”

Flexible PVA/Mn Ferrite/(MoS2)x Nanocomposites With Electromagnetic Wave Absorption Performance for Light Dependent Resistances

“…Due to its exceptional electromagnetic characteristics, the electromagnetic wave has the ability to be assimilated through both dielectric loss and magnetic loss. This particular capability serves as the chief source of guidance and inspiration for the development and design of electromagnetic wave absorbers [6–9] …”