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Collisional enhancement of energetic particle Alfvenic resonance width in tokamaks

机译:托克马克斯精力粒子占优势共振宽度的碰撞

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摘要

The phase-space structure of resonances between fast ions and an Alfvenic mode and the associated modification of density profiles in tokamaks are studied as a function of particle collisions. Guiding-center simulations in a realistic tokamak equilibrium are employed to address the resonance broadening parametric dependencies with respect to changes in the pitch-angle scattering rate. The rate of collisional replenishment, along with resonance strength, given by the combination of eigenmode and resonance structures and equilibrium parameters, determines saturation amplitudes for a given damping rate. As seen from the distribution function flattening, collisions have an effect of broadening the resonances, while the absolute value of delta f decreases with increasing collisionality. It is observed that the collisional broadening can be comparable to the collisionless resonance width due to the mode amplitude alone. The resonance broadening coefficients are compared with the existing theory based on analytically expected saturation levels, showing fair agreement. 'fhe results can be useful in assisting reduced kinetic models, such as quasilinear models, when prescribing the effective resonance phase-space width, i.e., the mode-particle interaction platform, due to collisional or turbulent processes. Published under license by AIP Publishing.
机译:作为颗粒碰撞的函数,研究了快速离子与烤肉模式之间的共振和相关修改的相位空间结构以及托卡马克的相关修改。采用逼真的Tokamak平衡中的引导中心模拟,以解决距极角散射速率的变化的共振拓宽参数依赖性。通过特征模和谐振结构的组合和谐振结构和平衡参数给出的碰撞补充,以及共振强度,确定给定阻尼速率的饱和幅度。从分布函数平坦所见,碰撞具有扩大共振的效果,而Delta F的绝对值随着累积性的增加而降低。观察到,由于单独的模式幅度,碰撞展会可以与碰撞共振宽度相当。基于分析预期的饱和度水平的现有理论比较了共振扩大系数,显示了公平的协议。 'FHE结果可用于辅助降低的动力学模型,例如Quasilinear模型,如碰撞或湍流过程所示的有效谐振相空间宽度,即模式粒子相互作用平台。通过AIP发布在许可证下发布。

著录项

  • 来源
    《Physics of plasmas》 |2019年第3期|共10页
  • 作者单位

    Princeton Univ Princeton Plasma Phys Lab POB 451 Princeton NJ 08543 USA;

    Princeton Univ Princeton Plasma Phys Lab POB 451 Princeton NJ 08543 USA;

    Princeton Univ Princeton Plasma Phys Lab POB 451 Princeton NJ 08543 USA;

    Max Planck Inst Plasma Phys Boltzmannstr 2 D-85748 Garching Germany;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 等离子体物理学;
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