DiPS: Diversified Plasma Simulator for Divertor, Space and Processing Plasma Simulation

Abstract

Summary form only given. DiPS (diversified plasma simulator), a new versatile linear machine (length=4000 mm, diameter=200-600 mm) is introduced for development of electric probe technology and its applications. As a unique feature for the diversified uses of sources and divertor simulator experiments, space and processing simulation chambers can be detached from and attached to the divertor simulation chamber by rail. To verify current theories and develop new theories of electric probes with magnetic field, collisionality, various particle source, and wide range of plasma parameters: density=106-10 14 cm-3, electron temperature=1-10 eV, magnetic field=0-2 kG, plasma types=RF and DC. To make a stable high density DC plasma, LaB6 disk of 4 inches is used as thermal electron emission source. Heater of LaB6 disk is made of graphite and the heating power is about 5 kW. Initial plasma density of the LaB6 source is 5times1012 cm-3, electron temperature is 8-10 eV. Plasma size is about 40 mm at pressure of 1.6 mtorr in test region and 100 mtorr in source region, which can be expanded up to 100 mm in diameter with lower magnetic field. Helicon plasma source is also developed as a high density RF plasma source in DiPS, which generates the plasma with density of 2times1013 cm-3 and electron temperature 3.5 eV for the RF power of 2.5 kW at optimum pressure of 7.5 mtorr. DiPS is to be utilized as simulators for fusion edge plasmas, space plasma and processing plasma