An electron Bernstein wave heating scheme for the Proto-MPEX linear device
| Autor: | R. W. Harvey, Yu. V. Petrov, D. L. Green, S. J. Diem |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
Cyclotron Atmospheric-pressure plasma Electron Plasma Condensed Matter Physics 01 natural sciences 010305 fluids & plasmas Computational physics law.invention Helicon Physics::Plasma Physics law 0103 physical sciences Electron temperature 010306 general physics Absorption (electromagnetic radiation) Microwave |
| Zdroj: | Physics of Plasmas. 25:072124 |
| ISSN: | 1089-7674 1070-664X |
| Popis: | Linear plasma devices, such as the Prototype Material Plasma Exposure eXperiment (Proto-MPEX), are an economic method to study plasma-material interactions under high heat and particle fluxes. The Proto-MPEX device at Oak Ridge National Laboratory is a high-density helicon plasma generator with additional resonant electron heating to study plasma-material interactions in ITER-like conditions. Here, we present modeling results of an electron Bernstein wave (EBW) heating scheme for this device using a microwave-based system. A 28 GHz injection system is available to provide power levels up to 100 kW injected into low electron temperature and high electron density plasmas. A modified version of the GENRAY ray-tracing code, GENRAY-C, has been used to determine the EBW and electron cyclotron heating wave accessibility for these overdense plasmas. Modeling has shown that greater than 80% of mode conversion from the ordinary mode to the EBW is possible for 28 GHz injection in Proto-MPEX. Calculations show that by utilizing the effects of Doppler-shifted resonance absorption, power deposition near the core is possible. Significant collisional damping, leading to edge absorption, is expected to occur for neutral pressures >1.0 mTorr; however, experiments can be designed to minimize these effects. |
| Databáze: | OpenAIRE |
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