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Effects of fast-Ion Injection on a Magnetized Sheath near a Floating Wall

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Plasma Science and Technology 2013年第1期15卷 1-6页

作者：李佳佳胡章虎宋远红王友年 School of Physics and Optoelectronic Technology Dalian University of Technology

A fully kinetic particle-in-cell/Monte Carlo model is employed to self-consistently study the effects of fast-ion injection on sheath potential and electric field profile in collisional magnetized plasma with a floating absorbing wall. The influences of the fast-ion injection velocity and density, the magnetic field and angle t^0 formed by the magnetic field and the x-axis on the sheath potential and electric field are discussed in detail. Numerical results show that increasing fast-ion injection density or decreasing injection velocity can enhance the potential drop and electric field in the sheath. Also, increasing the magnetic field strength can weaken the loss of charged particles to the wall and thus decrease the potential and electric field in the sheath. The time evolution of ion flux and velocity distribution on the wall is found to be significantly affected by the magnetic field.

关键词： fast ions magnetized plasma plasma sheath

A Code that Simulates fast-Ion Dα and Neutral Particle Measurements

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Communications in Computational Physics 2011年第8期10卷 716-741页

作者： W.W.Heidbrink D.Liu Y.Luo E.Ruskov B.Geiger Department of Physics and Astronomy University of CaliforniaIrvineCaliforniaCA 92697USA Max-Planck Institute fur Plasmaphysik GarchingGermany Department of Physics University of Wisconsin-MadisonMadisonWI 53706USA Tri Alpha Energy Corporation 27211 BurbankFoothill RanchCA 92610USA

A code that models signals produced by charge-exchange reactions between fast ions and injected neutral beams in tokamak plasmas is *** the fastion distribution function as input,the code predicts the efflux to a neutral particle analyzer(NPA)diagnostic and the photon radiance of Balmer-alpha light to a fastion Dα(FIDA)*** with both the primary injected neutrals and with the cloud of secondary"halo"neutrals that surround the beam are *** calculation of the fraction of neutrals that occupy excited atomic states(the collisionalradiative transition equations)is an important element of the *** with TRANSP output and other tests verify the *** selection of grid size and other parameters facilitate efficient *** output of the code has been validated by FIDA measurements on DIII-D but further tests are warranted.

关键词： fast ions

Gyrokinetic simulation of low-n Alfvénic modes in tokamak HL-2A plasmas

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Chinese Physics B 2023年第2期32卷 358-365页

作者：林文浩李继全 J Garcia S Mazzi Southwestern Institute of Physics Chengdu 610041China CEA IRFM13108Saint-Paul-lez-DuranceFrance EPFL Swiss Plasma CenterLausanneSwitzerland

The turbulence characteristics of plasmas with internal transport barriers in the HL-2A tokamak are analyzed by means of linear gyrokinetic simulations. It is found that turbulence is dominated by the ion temperature gradient(ITG)mode together with large-scale modes characterized by high-frequency electromagnetic fluctuation, which are destabilized by the steep ion temperature gradient in the weak magnetic shear regime. Comparison with solutions of analytical dispersion relations shows that their linear features match well with the beta-induced Alfvén eigenmode branch of the shear Alfvénic spectrum. It is further clarified that the large population of fast ions in these plasmas plays a stabilization role through the dilution mechanism in high-n ITG mode regimes.

关键词： low-n Alfvénic modes fast ions gyrokinetic simulation tokamak

Linear gyrokinetic simulations of reversed shear Alfvén eigenmodes and ion temperature gradient modes in DIII-D tokamak

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Plasma Science and Technology 2021年第1期23卷 32-38页

作者：王虹宇刘鹏飞林志宏张文禄 Fusion Simulation Center Peking UniversityBeijing 100871People’s Republic of China Department of Physics and Astronomy University of CaliforniaIrvineCA 92697United States of America Institute of Physics Chinese Academy of SciencesBeijing 100190People’s Republic of China

Global linear gyrokinetic simulations using realistic DIII-D tokamak geometry and plasma profiles find co-existence of unstable reversed shear Alfvén eigenmodes(RSAE)with low toroidal mode number n and electromagnetic ion temperature gradient(ITG)instabilities with higher toroidal mode number *** intermediate n?=?[10,12],RSAE and ITG co-exist and overlap weakly in the radial domain with similar growth rates but different real *** RSAE and ITG growth rates decrease less than 5%when compressible magnetic perturbations are neglected in the *** ITG growth rates increase less than 7%when fast ions are not included in the ***,the effects of trapped electrons on the RSAE are negligible.

关键词： fast ions gyrokinetic simulation reversed shear Alfvén eigenmodes microturbulence