Benchmarking of codes for electron cyclotron heating and electron cyclotron current drive under ITER conditions

Prater, R.; Farina, D.; Gribov, Y.; Harvey, R. W.; Ram, A. K.; Lin‐Liu, Y. R.; Poli, E.; Смирнов, А. П.; Volpe, F.; Westerhof, E.; Zvonkov, A. V.

doi:10.1088/0029-5515/48/3/035006

Cited by 134 publications

(171 citation statements)

References 27 publications

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“…The main features of the five codes for ECH&CD computation currently ported to the ITM framework, are listed in Table 1. Three of these codes, namely GRAY [4], TORAY-FOM [5], and TORBEAM [6] had already been benchmarked in 2008 against other EC codes [7]. Since that benchmark, all the codes have been subject to changes to improve the description of various physics' aspects, e.g.…”

Section: Ec Codes Usedmentioning

confidence: 99%

“…The plasma parameters and geometry used for this benchmarking study are those of a standard ITER scenario, known as "Scenario 2", used also for the benchmark in [7]. It is an H-mode scenario, with nominal vacuum toroidal field B 0 = 5.3 T at major radius R 0 = 6.2 m, plasma current I p = 15 MA, central electron density n e,0 = 1.02 × 10 20 m −3 , central electron temperature T e,0 = 25 keV, and an effective ionic charge Z eff ∼ 1.7 roughly uniform throughout the plasma.…”

Section: Iter As Benchmarking Casementioning

confidence: 99%

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Benchmarking of electron cyclotron heating and current drive codes on ITER scenarios within the European Integrated Tokamak Modelling framework

Figini¹,

Decker

Farina³

et al. 2012

EPJ Web of Conferences

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Abstract.A number of electron cyclotron codes have been developed in different European laboratories, to describe the behavior of EC waves in realistic tokamak plasma scenarios, and to optimize EC heating and current drive efficiency in present, and future devices like ITER. Moreover, integrated modelling is gaining popularity, since it seems to be the optimum approach for modelling tasks as complex as the assessment of future large devices performances. The outcome is presented here of a benchmark exercise for a set of EC codes, performed within the framework of the European Integrated Tokamak Modelling Task Force, and based on a standard ITER scenario, considering multiple launching conditions of the EC waves. The advantages offered by integrated modelling are explored and exploited, and the sources of the small-but-still-present differences among the various codes results are investigated.

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Section: Ec Codes Usedmentioning

confidence: 99%

Section: Iter As Benchmarking Casementioning

confidence: 99%

Benchmarking of electron cyclotron heating and current drive codes on ITER scenarios within the European Integrated Tokamak Modelling framework

Figini¹,

Decker

Farina³

et al. 2012

EPJ Web of Conferences

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“…EC deposition has been treated by 1D ray tracing and more complex full-wave calculations [3] and benchmarked against experimental deposition measurements [4]. Still, unresolved questions with significance for ITER remain.…”

Section: Introductionmentioning

confidence: 99%

Experimental Measurement of ECH Deposition Broadening: Beyond Anomalous Transport

et al. 2017

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Abstract. This work provides a first experimental measurement of broadened ECH deposition on the DIII-D tokamak. As seen in theory[1] and simulation [2], refraction by edge density fluctuations shifts the path of RF waves, altering ECH and ECCD deposition. This paper reports on an initial experimental confirmation of broadened ECH deposition on DIII-D tokamak. T e measurements from a 48 channel 2nd Harmonic ECE Radiometer digitized at 500 kHz are used with a set of broadened trial ECH deposition functions to calculate time-dependent, modulation-induced heat fluxes. The fitting of convective and diffusive transport to these fluxes allows different ECH deposition profiles to be compared. The best-fit ECH deposition produces reasonable transport coefficients which compare favorably with simulation. This method is applied to a set of L-and H-mode DIII-D discharges. Accounting for diffusive, convective, and coupled transport, the ECH deposition profile is found to be 2 to 3 times wider than predicted by TORAY-GA ray tracing.

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“…It is pointed out that conserving momentum in electron-electron collisions may have the effect for the current [4], it is necessary to modify the operator to conserve momentum. The Ray tracing code shows a large impact of parallel momentum conservation for ECCD simulation [5,6].…”

Section: Introductionmentioning

confidence: 99%

Development of Momentum Conserving Monte Carlo Simulation Code for ECCD Study in Helical Plasmas

Murakami

Hasegawa

Moriya

2015

EPJ Web of Conferences

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Abstract. Parallel momentum conserving collision model is developed for GNET code, in which a linearized drift kinetic equation is solved in the five dimensional phase-space to study the electron cyclotron current drive (ECCD) in helical plasmas. In order to conserve the parallel momentum, we introduce a field particle collision term in addition to the test particle collision term. Two types of the field particle collision term are considered. One is the high speed limit model, where the momentum conserving term does not depend on the velocity of the background plasma and can be expressed in a simple form. The other is the velocity dependent model, which is derived from the Fokker-Planck collision term directly. In the velocity dependent model the field particle operator can be expressed using Legendre polynominals and, introducing the Rosenbluth potential, we derive the field particle term for each Legendre polynominals. In the GNET code, we introduce an iterative process to implement the momentum conserving collision operator. The high speed limit model is applied to the ECCD simulation of the heliotron-J plasma. The simulation results show a good conservation of the momentum with the iterative scheme.

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Benchmarking of codes for electron cyclotron heating and electron cyclotron current drive under ITER conditions

Cited by 134 publications

References 27 publications

Benchmarking of electron cyclotron heating and current drive codes on ITER scenarios within the European Integrated Tokamak Modelling framework

Benchmarking of electron cyclotron heating and current drive codes on ITER scenarios within the European Integrated Tokamak Modelling framework

Experimental Measurement of ECH Deposition Broadening: Beyond Anomalous Transport

Development of Momentum Conserving Monte Carlo Simulation Code for ECCD Study in Helical Plasmas

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