Resolving magnetic field line stochasticity and parallel thermal transport in MHD simulations
- Univ. of Wisconsin, Madison, WI (United States). Dept. of Engineering Physics
Heat transport along braided, or chaotic magnetic field lines is a key to understand the disruptive phase of tokamak operations, both the major disruption and the internal disruption (sawtooth oscillation). Recent sawtooth experimental results in the Tokamak Fusion Test Reactor (TFTR) have inferred that magnetic field line stochasticity in the vicinity of the q = 1 inversion radius plays an important role in rapid changes in the magnetic field structures and resultant thermal transport. In this study, the characteristic Lyapunov exponents and spatial correlation of field line behaviors are calculated to extract the characteristic scale length of the microscopic magnetic field structure (which is important for net radial global transport). These statistical values are used to model the effect of finite thermal transport along magnetic field lines in a physically consistent manner.
- Research Organization:
- Univ. of Wisconsin, Center for Plasma Theory and Computation, Madison, WI (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG02-86ER53218
- OSTI ID:
- 334073
- Report Number(s):
- CONF-9803121-PROC.; ON: DE99001004; TRN: 99:005149
- Resource Relation:
- Conference: Workshop on nonlinear MHD and extended MHD, Atlanta, GA (United States), 25-26 Mar 1998; Other Information: PBD: [1998]; Related Information: Is Part Of Proceedings of the workshop on nonlinear MHD and extended MHD; PB: [75] p.
- Country of Publication:
- United States
- Language:
- English
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