An investigation of thermal transport during tokamak sawtooth events
- Univ. of Wisconsin, Madison, WI (United States)
A numerical investigation of the m = 1, n = 1 ideal/resistive kink mode is undertaken with an emphasis on understanding the important mechanisms that control the temperature dynamics during a sawtooth event. Recently, the magnetic field line structure and the temperature profile have been measured simultaneously during a sawtooth crash phase. A possible interpretation of the experiments could be that a stochastization of the magnetic field lines in the vicinity of the q = 1 surface occurs and because of this, fast electron thermal energy transport ensues. To explore the details of this energy transport, and also the time scale of the final stage of the crash, non-linear MHD simulations of the m = 1, n = 1 mode are being conducted with the FAR code. The calculations include a pressure evolution equation which account for thermal transport self-consistently and are based on an incompressibility assumption and large aspect ratio expansion. A curvature effect term has been implemented to study the finite pressure effects and toroidal effects on the mode. The formation and the evolution of the m = 1, n = 1 magnetic island and the pressure evolution will also be presented.
- DOE Contract Number:
- FG02-86ER53218
- OSTI ID:
- 489547
- Report Number(s):
- CONF-960354-; TRN: 97:011694
- Resource Relation:
- Conference: International Sherwood fusion theory conference, Philadelphia, PA (United States), 18-20 Mar 1996; Other Information: PBD: 1996; Related Information: Is Part Of 1996 international Sherwood fusion theory conference; PB: 244 p.
- Country of Publication:
- United States
- Language:
- English
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