تقرير
Early evolution of electron cyclotron driven current during suppression of tearing modes in a circular tokamak
| العنوان: | Early evolution of electron cyclotron driven current during suppression of tearing modes in a circular tokamak |
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| المؤلفون: | Pratt, J., Huijsmans, G. T. A., Westerhof, E. |
| سنة النشر: | 2016 |
| المجموعة: | Physics (Other) |
| مصطلحات موضوعية: | Physics - Plasma Physics |
| الوصف: | When electron cyclotron (EC) driven current is first applied to the inside of a magnetic island, the current spreads throughout the island and after a short period achieves a steady level. Using a two equation fluid model for the EC current that allows us to examine this early evolution in detail, we analyze high-resolution simulations of a 2/1 classical tearing mode in a low-beta large aspect-ratio circular tokamak. These simulations use a nonlinear 3D reduced-MHD fluid model and the JOREK code. During the initial period where the EC driven current grows and spreads throughout the magnetic island, it is not a function of the magnetic flux. However, once it has reached a steady-state, it should be a flux function. We demonstrate numerically that if sufficiently resolved toroidally, the steady-state EC driven current becomes approximately a flux function. We discuss the physics of this early period of EC evolution and its impact on the size of the magnetic island. Comment: 12 pages, 7 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1063/1.4964785 |
| URL الوصول: | http://arxiv.org/abs/1609.08850 |
| رقم الأكسشن: | edsarx.1609.08850 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1063/1.4964785 |
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