Visualization of Fast Ion Phase-Space Flow Driven by Alfvén Instabilities,Physical Review Letters

当前位置： X-MOL 学术 › Phys. Rev. Lett. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Visualization of Fast Ion Phase-Space Flow Driven by Alfvén Instabilities
Physical Review Letters ( IF 8.1 ) Pub Date : 2021-12-01 , DOI: 10.1103/physrevlett.127.235002
X D Du ₁ , M A Van Zeeland ₁ , W W Heidbrink ₂ , J Gonzalez-Martin ₂ , K Särkimäki ₃ , A Snicker ₄ , D Lin ₂ , C S Collins ₁ , M E Austin ₅ , G R McKee ₆ , Z Yan ₆ , Y Todo ₇ , W Wu ₁

Affiliation

Fast ion phase-space flow, driven by Alfvén eigenmodes (AEs), is measured by an imaging neutral particle analyzer in the DIII-D tokamak. The flow firstly appears near the minimum safety factor at the injection energy of neutral beams, and then moves radially inward and outward by gaining and losing energy, respectively. The flow trajectories in phase space align well with the intersection lines of the constant magnetic moment surfaces and constant

E - (ω / n) P_{ζ}

surfaces, where

E

P_{ζ}

are the energy and canonical toroidal momentum of ions;

ω

and

n

are angular frequencies and toroidal mode numbers of AEs. It is found that the flow is so destructive that the thermalization of fast ions is no longer observed in regions of strong interaction. The measured phase-space flow is consistent with nonlinear hybrid kinetic-magnetohydrodynamics simulation. Calculations of the relatively narrow phase-space islands reveal that fast ions must transition between different flow trajectories to experience large-scale phase-space transport.

中文翻译：

阿尔文不稳定性驱动的快离子相空间流的可视化

由阿尔文本征模式 (AE) 驱动的快速离子相空间流由 DIII-D 托卡马克中的成像中性粒子分析仪测量。流动首先在中性束注入能量处出现在最小安全系数附近，然后分别通过获得和失去能量而径向向内和向外移动。相空间中的流动轨迹与恒磁矩面和恒磁矩面的交线吻合得很好。