Speaker
Description
High-density linear plasma devices can produce plasmas similar to that of the Tokamaks[1,2]. But, they are simple and compact than the tokamaks. The linear devices are much more cost-effective than the tokamaks for research on plasma material interactions.
In this research, a linear helicon plasma device with permanent magnets was fabricated. A half-turn helical antenna and 13.56 MHz RF were used to excite helicon wave of m = +1. The 800 G magnetic field is uniform in the vicinity of the antenna. Ar gas was used for the plasma discharges. The electron temperatures and plasma densities were obtained by using optical emission spectroscopy(OES) and Langmuir probe. When the helicon waves were excited by RF power more than 400 W, high-density plasmas of more than 10^13 cm^(-3) were obtained. The electron temperatures were in the ranges of 1 – 5 eV. The linear helicon plasma device developed in work is excellence for the studies of plasma material interaction (PMI) for development of fusion related materials. The ion fluence, similar to that of the plasma-facing wall in tokamaks, can be investigated.
Reference
1. Caughman et al., Plasma source development for fusion-relevant material testing, Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 35, 03E114 (2017)
2. R. H Goulding et al., Progress in the Development of a High Power Helicon Plasma Source for the Materials Plasma Exposure Experiment, Fusion Science and Technology, (2017)
