Full-wave Electromagnetic Field Simulations of Lower Hybrid Waves in Tokamaks

Journal Article · Fri Sep 28 00:00:00 EDT 2007 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2800494· OSTI ID:21032775

Wright, J C; Bonoli, P T ^[1]; Brambilla, M ^[2]; Phillips, C K; Valeo, E ^[3]

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1. MIT-Plasma Science and Fusion Center Cambridge, MA 02139 (United States)
2. Institute fuer Plasma Physik Garching (Germany)
3. Princeton Plasma Physics Laboratory-Princeton, New Jersey (United States)

Alcator C-Mod is similar in density, field, and plasma shape to ITER and consequently, the lower hybrid (LH) wave dispersion is very similar. The differences in temperature between the two devices do affect the relation between n{sub parallel} and the location at which damping occurs. Even with a parallel code, LH on ITER is a petascale problem requiring on the order of 100 000 processor cores and 10 000 poloidal modes to complete in one hour. Alcator C-Mod is 1/10th the scale of ITER requiring 1000 times less computation and simulations of LH in this machine have required on the order of 1000 cpu-hours. Therefore, we focus on analysis of full-wave physics effects in LH propagation in Alcator C-Mod using the LH version of the TORIC code [J. C. Wright et al., Phys. Plasmas 11, 2473 (2004)] and contrast those results with ray tracing calculations. Non-Maxwellian effects through development of the quasilinear plateau also play a role and both codes have a generalized dielectric using numerically calculated distributions [Valeo in this proceedings] to incorporate this effect. We will discuss issues of resolution requirements, algorithm improvements, and convergence as well, and speculate on further changes to the algorithms that may enable simulations of ITER with less than petascale requirements.

• OSTI ID: 21032775
• Journal Information: AIP Conference Proceedings, Vol. 933, Issue 1; Conference: 17. topical conference on radio frequency power in plasmas, Clearwater, FL (United States), 7-9 May 2007; Other Information: DOI: 10.1063/1.2800494; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALCATOR DEVICE
ALGORITHMS
CALCULATION METHODS
CONVERGENCE
DAMPING
DIELECTRIC MATERIALS
DISTRIBUTION
ELECTROMAGNETIC FIELDS
ITER TOKAMAK
LOWER HYBRID CURRENT DRIVE
LOWER HYBRID HEATING
PLASMA
PLASMA DENSITY
PLASMA INSTABILITY
PLASMA SIMULATION