Plasma and Fusion Research
Volume 14, 3401134 (2019)
Regular Articles
- 1)
- Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
- 2)
- National Institute for Fusion Science, Toki 509-5292, Japan
Abstract
The Ring Trap 1 (RT-1) device creates a laboratory magnetosphere, that is motivated by the Jovian magnetosphere, which contains self-organized, high-beta plasmas. In the RT-1 plasmas, the density limit for 8.2 GHz electron cyclotron heating (ECH) occurs at the electron densities 8.0×1017 m−3 and for 2.45 GHz ECH, 1.6×1017 m−3. We have used full-wave simulations to study the propagation and absorption of electromagnetic waves in the RT-1 plasmas in an effort to understand the observed density limits as well as the over-dense state in which the actual density exceeds the cutoff density of the magnetospheric plasma. The simulation results cannot explain the experimentally observed over-dense states and density limits in the view of the power absorption. We discuss possible reasons for the gap between the experiments and the simulation results.
Keywords
magnetospheric plasma, ECH, electron cyclotron wave, electric field, over dense plasma, electromagnetic wave propagation
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