Resistive MHD modelling of the quasi-single helicity state in the KTX regimes
- Univ. of Science and Technology of China, Hefei (China)
- Univ. of Science and Technology of China, Hefei (China); Univ. of Wisconsin, Madison, WI (United States)
Here, the potential formation of a quasi-single-helicity (QSH) state in the Keda Torus eXperiment (KTX) is investigated in resistive MHD simulations using the NIMROD code. We focus on the effects of finite resistivity on the mode structure and characteristics of the dominant linear and nonlinear resistive tearing-mode in a finite β, cylindrical configuration of a reversed field pinch model for KTX. In the typical resistive regimes of KTX where the Lundquist number $$S=5 \times 10^4$$ , the plasma transitions to a steady QSH state after evolving through an initial transient phase with multiple helicities. The dominant mode of the QSH state develops from the dominant linear tearing mode instability. In the lower β regime, the QSH state is intermittent and short in duration; in the higher β regime, the QSH state persists for a longer time and should be more easily observed in experiments.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Contributing Organization:
- KTX Team
- Grant/Contract Number:
- AC02-05CH11231; FC02-08ER54975; FG02-86ER53218
- OSTI ID:
- 1523626
- Journal Information:
- Nuclear Fusion, Vol. 58, Issue 1; ISSN 0029-5515
- Publisher:
- IOP ScienceCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Similar Records
Improved Particle Confinement in Transition from Multiple-Helicity to Quasi-Single-Helicity Regimes of a Reversed-Field Pinch
Thermal transport dynamics in the quasi-single helicity state