CAJ | 학술논문

中性束加热将应用于先进实验超导托卡马克装置中,在改善等离子性能的同时也会激发起多种阿尔文不稳定性.本文主要采用了数值模拟的方法在理论上研究了中性束注入时在台基区激发的离散阿尔文本征模(αTAE)和环效应阿尔文本征模(TAE),结果表明在这个区域会激发出丰富的离散阿尔文不稳定性,这种离散阿尔文不稳定性不同于传统的TAE,这种模式是俘获在气球模驱动势阱中的束缚态,由于气球模势阱的存在使它和连续谱解耦,从势阱中漏出去的能量可以忽略不计,和TAE类似都很容易被激发,这种模式可以存在于gap内,也可以存在于gap外,频谱更宽泛.注入功率越大这种不稳定性增长率越大.这种不稳定性可能会影响等离子体的物理行为,从而影响等离子体的约束.
중성속가열장응용우선진실험초도탁잡마극장치중,재개선등리자성능적동시야회격발기다충아이문불은정성.본문주요채용료수치모의적방법재이론상연구료중성속주입시재태기구격발적리산아이문본정모(αTAE)화배효응아이문본정모(TAE),결과표명재저개구역회격발출봉부적리산아이문불은정성,저충리산아이문불은정성불동우전통적TAE,저충모식시부획재기구모구동세정중적속박태,유우기구모세정적존재사타화련속보해우,종세정중루출거적능량가이홀략불계,화TAE유사도흔용역피격발,저충모식가이존재우gap내,야가이존재우gap외,빈보경관범.주입공솔월대저충불은정성증장솔월대.저충불은정성가능회영향등리자체적물리행위,종이영향등리자체적약속.
The neutral beam injection (NBI) system is applied to the experimental advanced superconducting tokamak (EAST). It will excite some Alfv′en instabilities when the plasma characteristics are improved. The numerical research on the NBI-induced discrete Alfv′en eigenmode (αTAE) and toroidal effect-induced Alfv′en eigenmode (TAE) in the pedestal region is presented in the paper. The research results show that plenty ofαTAEs appear in this region. TheαTAE is very different from the TAE. These modes are trapped by theα-induced potential wells along the magnetic field line. Due to negligible continuum damping via wave energy tunneling, similar to TAE, theαTAE can also be readily destabilized by energetic particles. Differently,αTAE frequency spectrum is more broad than TAE, and they are existed not only inside the gap but also outside the gap. The growth rate increases with injected power increasing. This instability maybe affects the physical behavior of the tokamak and the confinement of the plasma.