Investigation of the long-lived saturated internal mode and its control on the HL-2A tokamak

Deng, Wei; Liu, Yi; Wang, Xianqu; Chen, Wei; Dong, Ye; Ohdachi, S.; Ji, X.Q.; Shen, Yong; Cao, Jianfei; Jun, Zhou; Bei-bing, Feng; Li, Yonggao; Huang, Xianli; Gao, Jinming; Han, Xiaoyu; Huang, M.; Wang, Xiaogang

doi:10.1088/0029-5515/54/1/013010

Cited by 34 publications

(12 citation statements)

References 22 publications

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“…The size of the gap, related to the difference in energy, between the bonding and antibonding d states it is larger than the reported energy gap for all T i 2 N i, T i 2 F e, T i Zheng et al (2012). A similar situation was found for T i 2 CoGa when the sizes of the minority band gaps were 0.5eV Kervan et al (2012) and 0.68 eV Wei et al (2012). In this context, further investigations are needed to clarify the width of band gaps from minority spin channel in the T i 2 CoZ compounds with Z=Al or Ga.…”

Section: Resultssupporting

confidence: 60%

“…In the present paper, the half metallic properties of T i 2 CoSn are theoretically investigation by first-principles calculations of density of states, energy bands, and magnetic moments. The purpose is to analyze if the half-metallicity reported in T i 2 CoB Kervan et al (2011), T i 2 CoGe Huang et al (2012) and T i2CoZ(Z=Al, Ga, In) Bayar et al (2011); Kervan et al (2011Kervan et al ( , 2012; Wei et al (2012); Zheng et al (2012) is destroyed by the substitution of B, Ge, Al, Ga or In with Sn atoms.…”

Section: Introductionmentioning

confidence: 99%

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Half-metallic state and magnetic properties versus the lattice constant in Ti2CoSn Heusler compound: An ab initio study

Birsan

Palade

Kuncser

2012

Solid State Communications

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The half metallic properties of T i 2 CoSn full-Heusler compound is studied within the framework of the density functional theory with the Perdew Burke Ernzerhof generalized gradient approximation (GGA). Structural optimization was performed and the calculated equilibrium lattice constant is 6.340Ȧ. The spin up band of compound has metallic character and spin down band is semiconducting with an indirect gap of 0.598 eV at equilibrium lattice constant. For the lattice parameter, ranging from 6.193 to 6.884Ȧ the compound presents 100% spin polarization and a total magnetic moment of 3µ B .

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Section: Resultssupporting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Half-metallic state and magnetic properties versus the lattice constant in Ti2CoSn Heusler compound: An ab initio study

Birsan

Palade

Kuncser

2012

Solid State Communications

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“…The interchange mode with the constant amplitude looks similar to the long lived modes observed in tokamak plasmas. 49 The interaction between the energetic particles and the interchange mode for both the linear and nonlinear regimes should be carefully examined in the near future.…”

Section: Summary and Discussionmentioning

confidence: 99%

Comprehensive magnetohydrodynamic hybrid simulations of fast ion driven instabilities in a Large Helical Device experiment

et al. 2017

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Alfv en eigenmodes (AEs) destabilized by the neutral beam injection (NBI) in a Large Helical Device experiment are investigated using multi-phase magnetohydrodynamic (MHD) hybrid simulation, which is a combination of classical and MHD hybrid simulations for fast ions. The fast ion distribution is simulated with NBI, collisions, and losses in the equilibrium magnetic field in the classical simulation, while the MHD hybrid simulation takes account of the interaction between fast ions and an MHD fluid, in addition to the classical dynamics. It is found in the multi-phase hybrid simulation that the stored fast ion energy is saturated due to the interaction with AEs at a lower level than that of the classical simulation. Two groups of AEs with frequencies close to those observed in the experiment are destabilized alternately at each hybrid simulation. Firstly destabilized are two toroidal Alfv en eigenmodes whose frequency is close to the local minimum of the upper Alfv en continuous spectrum. Secondly destabilized is a global Alfv en eigenmode whose frequency is located well inside the Alfv en continuous spectrum gap. In addition, two AEs whose frequencies are close to that of the ellipticity-induced Alfv en eigenmode are observed with a lower amplitude. When the hybrid simulation is run continuously, the interchange mode grows more slowly than the AEs, but becomes dominant in the long time scale. The interchange mode oscillates with a constant amplitude and a frequency of $1 kHz. The interchange mode reduces the stored fast ion energy to a lower level than that of the AEs.

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“…ECRH can also mitigate long-lived modes via changing magnetic shear in the mode location. [95] 7. Conclusions.…”

Section: Reviewmentioning

confidence: 99%

Energetic Particle Physics on the HL-2A Tokamak: A Review

Shi¹,

Chen²,

Duan³

2021

Chinese Phys. Lett.

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Interaction between shear Alfvén wave (SAW) and energetic particles (EPs) is one of major concerns in magnetically confined plasmas since it may lead to excitation of toroidal symmetry breaking collective instabilities, thus enhances loss of EPs and degrades plasma confinement. In the last few years, Alfvénic zoology has been constructed on HL-2A tokamak and series of EPs driven instabilities, such as toroidal Alfvén eigenmodes (TAEs), revered shear Alfvén eigenmodes (RSAEs), beta induced Alfvén eigenmodes (BAEs), Alfvénic ion temperature gradient (AITG) modes and fishbone modes, have been observed and investigated. Those Alfvénic fluctuations show frequency chirping behaviors through nonlinear wave-particle route, and contribute to generation of axisymmetric modes by nonlinear wave-wave resonance in the presence of strong tearing modes. It is proved that the plasma confinement is affected by Alfvénic activities from multiple aspects. The RSAEs resonate with thermal ions, and this results in an energy diffusive transport process while the nonlinear mode coupling between core-localized TAEs and tearing modes trigger avalanche electron heat transport events. Effective measures have been taken to control SAW fluctuations and the fishbone activities are suppressed by electron cyclotron resonance heating. Those experimental results will not only contribute to better understandings of energetic particles physics, but also provide technology bases for active control of Alfvénic modes on International Thermonuclear Experimental Reactor (ITER) and Chinese Fusion Engineering Testing Reactor (CFETR).

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Investigation of the long-lived saturated internal mode and its control on the HL-2A tokamak

Cited by 34 publications

References 22 publications

Half-metallic state and magnetic properties versus the lattice constant in Ti2CoSn Heusler compound: An ab initio study

Half-metallic state and magnetic properties versus the lattice constant in Ti2CoSn Heusler compound: An ab initio study

Comprehensive magnetohydrodynamic hybrid simulations of fast ion driven instabilities in a Large Helical Device experiment

Energetic Particle Physics on the HL-2A Tokamak: A Review

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