ITER具有内部输运垒方案中的离散阿尔芬本征模  

Discrete Alfvén Eigenmodes in ITER with the Internal Transport Barrier Scenario

作　　者：欧阳思杰 胡双辉 欧阳学峰 朱万坡 兰源丹 黄旋格 OUYANG Sijie;HU Shuanghui;OUYANG Xuefeng;ZHU Wanpo;LAN Yuandan;HUANG Xuange(College of Physics,Guizhou University,Guiyang,Guizhou 550025,China)

机构地区：[1]贵州大学物理学院,贵州贵阳550025

出　　处：《计算物理》2023年第6期677-688,共12页Chinese Journal of Computational Physics

基　　金：国家自然科学基金(11775058);国家自然科学基金(12175049)资助项目。

摘　　要：基于国际热核聚变实验堆(ITER)装置具有内部输运垒(ITB)的方案,研究了离散阿尔芬本征模(αTAE)的物理特征,其中α是等离子体压强梯度的标度参数。采用基于负离子的中性束注入(NNBI)加热和电流驱动能获得一个大且强的ITB以实现更高的性能,并讨论该方案中αTAE的不稳定性。在纯射频方案中,探究了ITB的收缩、维持和坍塌过程中的αTAE。模拟结果表明:αTAE发生于具有陡峭压强梯度的ITB区域,形成的ITB越强会存在越多的αTAE,且该模式的频率也越高。在高能量粒子条件下αTAE的多个分支容易变得不稳定,被激发的αTAE其频率随着束能量的增加而增加。ITB作为高βp方案的关键,具有ITER稳态的许多理想特征,因此关联性地探究了DIII-D高βp方案中αTAE。The physical features of discrete Alfven eigenmodes(αTAEs)bounded by theα-induced potential wells are investigated in ITER(International Thermonuclear Experimental Reactor)with the ITB(internal transport barrier)scenario,whereαdenotes a measure of the pressure gradient.The use of the negative-ion-based neutral beam injection(NNBI)heating and current driving can obtain a large and strong ITB for higher performance,and the instability ofαTAE in this scheme is discussed.TheαTAEs during sustaining,shrinking and erosion of ITB are discussed upon the pure radio frequency scenario.It is found thatαTAEs exist in the ITB region due to the steep pressure gradient.More aTAEs exist in scenarios with strong ITB and the frequencies of these eigenmodes are higher.MultipleαTAEs are readily destabilized in the presence of energetic particles.The frequency of the excitedαTAEs increases with increasing beam energy.The highβ,scenario with ITB on DIII-D has many of the desired properties of ITER steady-state.TheαTAEs in highβ,scenariosarealso studied.

关 键 词：阿尔芬本征模 托卡马克 等离子体不稳定性 高能量粒子 

分 类 号：TL631.24[核科学技术—核技术及应用]