A global simulation study of ICRF heating in the LHD

Murakami, S.; Fukuyama, A.; Akutsu, T.; Nakajima, N.; Chan, V. S.; Choi, M.; Chiu, S. C.; Lao, L. L.; Kasilov, V.I.; Mutoh, T.; Kumazawa, R.; Seki, T.; Saito, Kenji; Watari, T.; Isobe, M.; Saida, T.; Sasao, M.

doi:10.1088/0029-5515/46/7/s05

Cited by 46 publications

(45 citation statements)

References 30 publications

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“…As the level of sophistication of the FP and wave solvers increased [14,15,16], the first attempts of selfconsistent modeling were made [10]. Nowadays, several toroidal full-wave codes have been interfaced with two-dimensional velocity-space Fokker-Planck solvers in order to take into account non-Maxwellian distribution functions in the wave propagation and absorption [17,18,19,20,21,22]. Here we present an extension of the FP quasilinear solver SSFPQL, coupled to the full-wave solver TORIC [23], to include in the kinetic equation a source describing NBI and an heuristic model of losses of energetic ions.…”

Section: Introductionmentioning

confidence: 99%

“…Here we present an extension of the FP quasilinear solver SSFPQL, coupled to the full-wave solver TORIC [23], to include in the kinetic equation a source describing NBI and an heuristic model of losses of energetic ions. Compared with other successful approaches to the same problem, such as CQL3D-AORSA [17], GNET-TASK/WM [18], ORBIT-AORSA [21], and VENUS-LEMan [22], the SSFPQL-TORIC package requires relatively modest computing resources, without sacrificing any important aspect of the physics involved. Thus, with the help of scripts automatically driving the iterations, fully converged simulations with very high resolution in real and velocity space can be achieved in a few hours on a laptop.…”

Section: Introductionmentioning

confidence: 99%

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Simulations of combined neutral beam injection and ion cyclotron heating with the TORIC-SSFPQL package

et al. 2011

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Abstract.A source describing the injection of fast ions due to the ionization of high-energy neutral beams has been added to the surface-averaged quasilinear Fokker-Planck code SSFPQL (M. Brambilla 1994 Nuclear Fusion 34 1121). For this purpose, the multiplebeam NBI code SINBAD (Y. Feng et al. 1995, Comp. Phys. Comm. 88 161) has been included as a module in SSFPQL, with the modifications required to handle arbitrary axisymmetric equilibria. Alternatively, the Neutral Beam Injection (NBI) source can be built using the output of a Monte Carlo NBI code. We have also added a term describing losses of fast ions during thermalization, and a subroutine evaluating the neutron production rate by nuclear reactions. With these extensions, iterations between SSFPQL and the full-wave solver TORIC (M. Brambilla 1999 Plasma Phys. Control. Fusion 41 1) can now be used to investigate the strong interplay between NBI and Ion Cyclotron (IC) heating. By comparing the predicted and measured neutron production rates from D-D reactions in a discharge with combined NBI and IC heating in ASDEX Upgrade we obtain a plausible estimate of the importance of fast ion losses, even if their cause cannot be identified. We find, however, that the plasma composition, in particular the presence low Z impurities, plays a more critical role than fast ion losses in limiting the efficiency of this heating scheme.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simulations of combined neutral beam injection and ion cyclotron heating with the TORIC-SSFPQL package

et al. 2011

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“…2.1 are the same as the full analyses [3] where models of full analyses are used only in part b) explained in Sec. 2.1.…”

Section: Comparision Of Results Of the Developed Code With Full Analysesmentioning

confidence: 99%

“…The orbit of each fast ion is traced with the guiding center equations. In the acceleration term, a model [3] in which the fast ions are accelerated in a direction perpendicular to field line on the resonance layer is used for clarifying effects of position and shape of a resonance layer on the fast ion's behavior. In a collision with bulk plasma, the collision operator [4] which includes a pitch angle scatter and energy relaxation is adopted.…”

Section: Models In the Developed Codementioning

confidence: 99%

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Evaluation of Efficiency of Power Transferred from ICRF Fast Ions to Bulk Plasma Based on Orbit Following in Real Coordinates in LHD

Seki

Watanabe

et al. 2015

Plasma and Fusion Research

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In order to optimize the transferred power efficiency from ICRF fast ions to bulk plasma, we have developed a code in which models of behaviors of ICRF fast ion are minimally adopted in order to save calculation time. A tendency of the transferred power efficiencies evaluated by the developed code is almost the same as that evaluated from the full analyses. In the regime with low efficiency of transferred power, the effect of the position of the resonance layer is large. The efficiency of the resonance layer through the point near the magnetic axis is found to be smaller than that of the typical ICRF resonance layer. Keywords: ICRF fast ion, evaluation of transferred power efficiency and transferred power profile

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Optimization Study of ICRF Heating in the LHD and HSX Configurations

Murakami

Yamamoto

Fukuyama

et al. 2010

Contrib. Plasma Phys.

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Two global simulation codes, TASK/WM (a full wave solver) and GNET (a 5-D drift kinetic equation solver), are combined to simulate the ICRF heating in the 3D magnetic configuration. The combined code is applied to the ICRF minority heating in the LHD configuration. An optimization of the ICRF heating is considered in changing the magnetic configurations and the resonance surfaces in the LHD plasmas using GNET code. It is found that the heating efficiency is improved about 30% with the heating power of 10MW in the optimized heating scenario from that of the present standard off-axis heating scenario. Also the ICRF minority heating is studied in the HSX plasma and it is found that the ICRF heating of about 100kW is still effective to heat the plasma even ρ/a ∼ 1/7.5 for tail ions.

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A global simulation study of ICRF heating in the LHD

Cited by 46 publications

References 30 publications

Simulations of combined neutral beam injection and ion cyclotron heating with the TORIC-SSFPQL package

Simulations of combined neutral beam injection and ion cyclotron heating with the TORIC-SSFPQL package

Evaluation of Efficiency of Power Transferred from ICRF Fast Ions to Bulk Plasma Based on Orbit Following in Real Coordinates in LHD

Optimization Study of ICRF Heating in the LHD and HSX Configurations

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