Modeling of the ECCD injection effect on the Heliotron J and LHD plasma stability

Varela, J.; Nagasaki, K.; Nagaoka, K.; Yamamoto, S.; Watanabe, K. Y.; Spong, D. A.; Garcia, L.; Cappa, A.; Azegami, A.

doi:10.1088/1741-4326/abad84

Modeling of the ECCD injection effect on the Heliotron J and LHD plasma stability

Journal Article · Tue Sep 22 00:00:00 EDT 2020 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/abad84· OSTI ID:1772609

^[1]; ^[2]; ^[3]; Yamamoto, S. ^[4]; ^[4]; ^[5]; ^[6]; ^[7]; Azegami, A. ^[8]

National Inst. of Natural Science, Toki (Japan). National Inst. for Fusion Science; Univ. Carlos III de Madrid (Spain)
Kyoto Univ., Uji (United States). Inst. of Advanced Energy
National Inst. of Natural Science, Toki (Japan). National Inst. for Fusion Science; Nagoya Univ. (Japan)
National Inst. of Natural Science, Toki (Japan). National Inst. for Fusion Science
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. Carlos III de Madrid (Spain)
Lab. Nacional de Fusion CIEMAT, Madrid (Spain)
Nagoya Univ. (Japan)

The aim of the study is to analyze the stability of the energetic particle modes (EPM) and Alfven Eigenmodes (AE) in Helitron J and LHD plasma if the electron cyclotron current drive (ECCD) is applied. Additionally, the analysis is performed using the code FAR3d that solves the reduced MHD equations describing the linear evolution of the poloidal flux and the toroidal component of the vorticity in a full 3D system, coupled with equations of density and parallel velocity moments for the energetic particle (EP) species, including the effect of the acoustic modes. The Landau damping and resonant destabilization effects are added via the closure relation. The simulation results show that the n = 1 EPM and n = 2 global AE (GAE) in Heliotron J plasma can be stabilized if the magnetic shear is enhanced at the plasma periphery by an increase (co-ECCD injection) or decrease (ctr-ECCD injection) of the rotational transform at the magnetic axis ($$\rlap{-} \iota_{0}$$). In the ctr-ECCD simulations, the EPM/AE growth rate decreases only below a given $$\rlap{-} \iota_{0}$$, similar to the ECCD intensity threshold observed in the experiments. In addition, ctr-ECCD simulations show an enhancement of the continuum damping. The simulations of the LHD discharges with ctr-ECCD injection indicate the stabilization of the n = 1 EPM, n = 2 toroidal AE (TAE) and n = 3 TAE, caused by an enhancement of the continuum damping in the inner plasma leading to a higher EP β threshold with respect to the co- and no-ECCD simulations.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: JSPS KAKENHI; USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1772609

Alternate ID(s):: OSTI ID: 23018681

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 11 Vol. 60; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

References (36)

Numerical calculations using the full MHD equations in toroidal geometry Charlton, L. A.; Holmes, J. A.; Hicks, H. R. Journal of Computational Physics, Vol. 63, Issue 1 https://doi.org/10.1016/0021-9991(86)90086-0	journal	March 1986
Compressible linear and nonlinear resistive MHD calculations in toroidal geometry Charlton, L. A.; Holmes, J. A.; Lynch, V. E. Journal of Computational Physics, Vol. 86, Issue 2 https://doi.org/10.1016/0021-9991(90)90102-7	journal	February 1990
Heating and current drive by electron cyclotron waves Prater, R. Physics of Plasmas, Vol. 11, Issue 5 https://doi.org/10.1063/1.1690762	journal	May 2004
Effect of fast electrons on the stability of resistive interchange modes in the TJ-II stellarator García, L.; Ochando, M. A.; Carreras, B. A. Physics of Plasmas, Vol. 23, Issue 6 https://doi.org/10.1063/1.4954826	journal	June 2016
Alpha‐Alfvén local dispersion relation and solutions Hedrick, C. L.; Leboeuf, J. ‐N.; Spong, D. A. Physics of Fluids B: Plasma Physics, Vol. 4, Issue 12 https://doi.org/10.1063/1.860344	journal	December 1992
Linearized gyrofluid model of the alpha‐destabilized toroidal Alfvén eigenmode with continuum damping effects Spong, D. A.; Carreras, B. A.; Hedrick, C. L. Physics of Fluids B: Plasma Physics, Vol. 4, Issue 10 https://doi.org/10.1063/1.860386	journal	October 1992
Steepest-descent moment method for three-dimensional magnetohydrodynamic equilibria Hirshman, S. P. Physics of Fluids, Vol. 26, Issue 12 https://doi.org/10.1063/1.864116	journal	January 1983
Characteristics of Alfvén eigenmodes, burst modes and chirping modes in the Alfvén frequency range driven by negative ion based neutral beam injection in JT-60U Kusama, Y.; Kramer, G. J.; Kimura, H. Nuclear Fusion, Vol. 39, Issue 11Y https://doi.org/10.1088/0029-5515/39/11Y/324	journal	November 1999
Stability of alpha particle driven Alfvén eigenmodes in high performance JET DT plasmas Sharapov, S. E.; Borba, D.; Fasoli, A. Nuclear Fusion, Vol. 39, Issue 3 https://doi.org/10.1088/0029-5515/39/3/307	journal	March 1999
Effects of non-vanishing toroidal current densities on stability in the Wendelstein 7-AS stellarator Sallander, E.; Weller, A.; Team, W7-As Nuclear Fusion, Vol. 40, Issue 8 https://doi.org/10.1088/0029-5515/40/8/308	journal	August 2000
Recent progress of Alfvén eigenmode experiments using N-NB in JT-60U tokamak Shinohara, K.; Takechi, M.; Ishikawa, M. Nuclear Fusion, Vol. 42, Issue 8 https://doi.org/10.1088/0029-5515/42/8/302	journal	August 2002
MHD instabilities and their effects on plasma confinement in Large Helical Device plasmas Toi, K.; Ohdachi, S.; Yamamoto, S. Nuclear Fusion, Vol. 44, Issue 2 https://doi.org/10.1088/0029-5515/44/2/001	journal	January 2004
Heating and current drive by electron cyclotron waves in JT-60U Suzuki, T.; Ide, S.; Hamamatsu, K. Nuclear Fusion, Vol. 44, Issue 7 https://doi.org/10.1088/0029-5515/44/7/002	journal	May 2004
Stabilization of neoclassical tearing mode by ECCD and its evolution simulation on JT-60U tokamak Nagasaki, K.; Isayama, A.; Hayashi, N. Nuclear Fusion, Vol. 45, Issue 12 https://doi.org/10.1088/0029-5515/45/12/016	journal	November 2005
Experimental studies of energetic-ion-driven MHD instabilities in Large Helical Device plasmas Yamamoto, S.; Toi, K.; Ohdachi, S. Nuclear Fusion, Vol. 45, Issue 5 https://doi.org/10.1088/0029-5515/45/5/003	journal	April 2005
Experimental observations of enhanced radial transport of energetic particles with Alfvén eigenmode on the LHD Osakabe, M.; Yamamoto, S.; Toi, K. Nuclear Fusion, Vol. 46, Issue 10 https://doi.org/10.1088/0029-5515/46/10/S07	journal	September 2006
High-power and long-pulse injection with negative-ion-based neutral beam injectors in the Large Helical Device Takeiri, Y.; Kaneko, O.; Tsumori, K. Nuclear Fusion, Vol. 46, Issue 6 https://doi.org/10.1088/0029-5515/46/6/S01	journal	May 2006
Stabilization and prevention of the 2/1 neoclassical tearing mode for improved performance in DIII-D Prater, R.; Haye, R. J. La; Luce, T. C. Nuclear Fusion, Vol. 47, Issue 5 https://doi.org/10.1088/0029-5515/47/5/001	journal	April 2007
Control of non-inductive current in Heliotron J Motojima, G.; Nagasaki, K.; Nosaku, M. Nuclear Fusion, Vol. 47, Issue 8 https://doi.org/10.1088/0029-5515/47/8/039	journal	August 2007
Stabilization of energetic-ion-driven MHD modes by ECCD in Heliotron J Nagasaki, K.; Yamamoto, S.; Kobayashi, S. Nuclear Fusion, Vol. 53, Issue 11 https://doi.org/10.1088/0029-5515/53/11/113041	journal	October 2013
Simulation of Alfvén frequency cascade modes in reversed shear-discharges using a Landau-closure model Spong, D. A. Nuclear Fusion, Vol. 53, Issue 5 https://doi.org/10.1088/0029-5515/53/5/053008	journal	April 2013
Mitigation of NBI-driven Alfvén eigenmodes by electron cyclotron heating in the TJ-II stellarator Nagaoka, K.; Ido, T.; Ascasíbar, E. Nuclear Fusion, Vol. 53, Issue 7 https://doi.org/10.1088/0029-5515/53/7/072004	journal	July 2013
Electron cyclotron heating can drastically alter reversed shear Alfvén eigenmode activity in DIII-D through finite pressure effects Van Zeeland, M. A.; Heidbrink, W. W.; Sharapov, S. E. Nuclear Fusion, Vol. 56, Issue 11 https://doi.org/10.1088/0029-5515/56/11/112007	journal	July 2016
RF current drive by electron cyclotron waves in the presence of magnetic islands Rosa, P. R. da Silva; Giruzzi, G. Plasma Physics and Controlled Fusion, Vol. 42, Issue 7 https://doi.org/10.1088/0741-3335/42/7/302	journal	May 2000
Influence of magnetic topology on transport and stability in stellarators Castejón, F.; Fujisawa, A.; Ida, K. Plasma Physics and Controlled Fusion, Vol. 47, Issue 12B https://doi.org/10.1088/0741-3335/47/12B/S05	journal	November 2005
The effects of electron cyclotron heating and current drive on toroidal Alfvén eigenmodes in tokamak plasmas Sharapov, S. E.; Garcia-Munoz, M.; Van Zeeland, M. A. Plasma Physics and Controlled Fusion, Vol. 60, Issue 1 https://doi.org/10.1088/1361-6587/aa90ee	journal	November 2017
Suppression of fast-ion-driven MHD instabilities by ECH/ECCD on Heliotron J Yamamoto, S.; Nagasaki, K.; Kobayashi, S. Nuclear Fusion, Vol. 57, Issue 12 https://doi.org/10.1088/1741-4326/aa8f04	journal	November 2017
Effect of ECH/ECCD on energetic-particle-driven MHD modes in helical plasmas Yamamoto, S.; Nagasaki, K.; Nagaoka, K. Nuclear Fusion, Vol. 60, Issue 6 https://doi.org/10.1088/1741-4326/ab7f13	journal	June 2020
Resistive Interchange Modes Destabilized by Helically Trapped Energetic Ions in a Helical Plasma Du, X. D.; Toi, K.; Osakabe, M. Physical Review Letters, Vol. 114, Issue 15 https://doi.org/10.1103/PhysRevLett.114.155003	journal	April 2015
Suppression of Trapped Energetic Ions Driven Resistive Interchange Modes with Electron Cyclotron Heating in a Helical Plasma Du, X. D.; Toi, K.; Ohdachi, S. Physical Review Letters, Vol. 118, Issue 12 https://doi.org/10.1103/PhysRevLett.118.125001	journal	March 2017
Steady-State Fully Noninductive Current Driven by Electron Cyclotron Waves in a Magnetically Confined Plasma Sauter, O.; Henderson, M. A.; Hofmann, F. Physical Review Letters, Vol. 84, Issue 15 https://doi.org/10.1103/PhysRevLett.84.3322	journal	April 2000
Progress on Electron Cyclotron Heating and Electron Cyclotron Current Drive Experiments in LHD Shimozuma, Takashi; Kubo, Shin; Yoshimura, Yasuo Fusion Science and Technology, Vol. 50, Issue 3 https://doi.org/10.13182/FST06-A1262	journal	October 2006
ECCD Experiments in the TJ-II Stellarator Fernández, A.; Cappa, A.; Castejón, F. Fusion Science and Technology, Vol. 53, Issue 1 https://doi.org/10.13182/FST08-A1670	journal	January 2008
High Performance of Neutral Beam Injectors for Extension of LHD Operational Regime Takeiri, Y.; Kaneko, O.; Tsumori, K. Fusion Science and Technology, Vol. 58, Issue 1 https://doi.org/10.13182/FST10-A10834	journal	August 2010
Transport Dynamics and Multi-Scale Coupling of Turbulence in LHD Inagaki, Shigeru; Tamura, Naoki; Nagashima, Yoshihiko Plasma and Fusion Research, Vol. 3 https://doi.org/10.1585/pfr.3.S1006	journal	January 2008
First Demonstration of Rotational Transform Control by Electron Cyclotron Current Drive in Large Helical Device Notake, Takashi; Shimozuma, Takashi; Kubo, Shin Plasma and Fusion Research, Vol. 3 https://doi.org/10.1585/pfr.3.S1077	journal	January 2008

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