Electron cyclotron current drive simulations for finite collisionality plasmas in Wendelstein 7-X using the full linearized collision model
| Autor: | Martin Heyn, Sergei Kasilov, Yuriy Turkin, Nikolai B. Marushchenko, Andreas Frank Martitsch, Winfried Kernbichler, Gernot Kapper |
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| Rok vydání: | 2016 |
| Předmět: |
Physics
Coulomb collision Cyclotron Electron Plasma Collisionality Condensed Matter Physics 7. Clean energy 01 natural sciences 010305 fluids & plasmas Computational physics law.invention Physics::Plasma Physics law Phase space Physics::Space Physics 0103 physical sciences Plasma parameter Wendelstein 7-X Atomic physics 010306 general physics |
| Zdroj: | Physics of Plasmas |
| ISSN: | 1089-7674 1070-664X |
| Popis: | The Electron Cyclotron Current Drive (ECCD) efficiency is usually modeled in the collisionless limit. While such models are sufficient for plasmas with rather low collisionality, they might underestimate the current drive in plasmas at low temperatures likely to occur at the initial phase of high density device operation. In this paper, the impact of finite collisionality effects on the wave-induced current drive is studied for a high-mirror configuration of Wendelstein 7-X using a combination of the drift kinetic equation solver NEO-2 and the ray-tracing code TRAVIS for a realistic set of plasma parameter profiles. The generalized Spitzer function, which describes the ECCD efficiency in phase space, is modeled with help of NEO-2, which uses the full linearized Coulomb collision operator, including energy and momentum conservation. Within this approach, the linearized drift kinetic equation is solved by means of the field line integration technique without any simplifications on device geometry. The resul... |
| Databáze: | OpenAIRE |
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