Overview of recent HL-2A experiments-猫眼课题宝

DOI：

10.1088/0029-5515/55/10/104022

发表时间：

2015

期刊：

Nuclear Fusion

影响因子：

3.3

通讯作者：

中科院分区：

物理与天体物理1区

文献类型：

作者：

M. Xu;X. Duan;J. Dong;X. Ding;L.W. Yan;Yi Liu;X. Song;Y. Huang;X. Zou;Q.W. Yang;D.Q. Liu;J. Rao;W. Xuan;L.Y. Chen;W. Mao;Q.M. Wang;Q. Li;Z. Cao;J.Y. Cao;G. Lei;J.H. Zhang;X.D. Li;Y. Xu;X. Ji;J. Cheng;W. Chen;L.M. Yu;W. Zhong;D. Yu;Y.P. Zhang;Z. Shi;C.Y. Chen;M. Isobe;S. Morita;Z. Cui;Y.B. Dong;B. Feng;C. Cui;M. Huang;G.S. Li;H. Li;Qing Li;J. Peng;Y.Q. Wang;B. Li;L. Yao;L. Yao;B. Yuan;J. Zhou;Y. Zhou;K. Itoh;Y. Liu

自上一次聚变能量大会以来，HL-2A实验在以下方面取得了重大进展：(I)低-中-高(L-I-H)跃迁和基座动力学物理；(Ii)磁流体力学(MHD)和高能粒子(EP)物理；(Iii)新经典撕裂模(NTM)和非局域输运之间的相互作用；(Iv)超声分子束注入(SMBI)缓解边缘局域模(ELM)。在中间阶段(I阶段)观察到两种类型的极限环振荡(LCoS)，这表明除了传统的涉及纬向流和湍流的捕食-被捕食过程外，还存在介于湍流和压力梯度之间的第二类捕食-被捕食过程。结果表明，在I-H相变之前，扭折型MHD模经常破裂，它通过增大边缘压力梯度和E×B流剪切来触发H模，从而抑制湍流输运。研究还发现，杂质浓度在无Elm H-模和I-相之间的多重转变中起着重要作用。此外，在无ELM的H模中，50-100 kHz附近的准相干模与基座密度梯度饱和有关。在存在强撕裂模的情况下，首次观察到了n=0的两种磁活动。傅立叶双相干分析表明，这些模式是由Alfvén本征模和低频MHD模之间的非线性耦合产生的。实验上识别了上扫面和下扫面的反向剪切Alfvén本征模。还研究了鱼骨模式和长寿命模式之间的转换。结果表明，鱼骨可以从LLM过渡到LLM，甚至触发撕裂模式(TMS)。对于非局地传输，确定了自组织临界性(SOC)理论中增强雪崩的主要特征，包括高赫斯特指数和大规模径向传播。实验结果表明，非局部迁移与非局部迁移密切相关。此外，SMBI在缓解榆树退化方面的研究也取得了很大进展。

Since the last Fusion Energy Conference, the HL-2A experiment has made significant progress in the following areas: (i) physics on low-intermediate-high (L-I-H) transition and pedestal dynamics; (ii) magnetohydrodynamic (MHD) and energetic-particle (EP) physics; (iii) interaction between neoclassical tearing modes (NTMs) and non-local transport; (iv) and edge localized mode (ELM) mitigation by supersonic molecular beam injection (SMBI). Two types of limit-cycle-oscillations (LCOs) were observed in the intermediate phase (I-phase), which indicated a second type of predator-prey process between turbulence and pressure gradient in addition to the conventional predator–prey involving zonal flows and turbulence. It was found that a kink-type MHD mode often crashed prior to the I-H transition, which played a crucial role in triggering H-mode by increasing the edge pressure gradient and E × B flow shear and consequently suppressing turbulent transport. It was also found that impurity concentration played an important role in the multi-transitions between ELM-free H-mode and I-phase. Besides, a quasi-coherent mode around 50–100 kHz was found to be associated with pedestal density gradient saturation in ELM-free H-mode. For the first time, two types of magnetic activities with n = 0 were observed in the presence of strong tearing modes. Fourier bicoherence analysis suggested that these modes were generated by the nonlinear coupling between Alfvén eigenmodes (AEs) and low-frequency MHD modes. Up- and down-sweeping reverse shear Alfvén eigenmodes (RSAEs) were identified experimentally. The transitions between fishbone and long-lived mode (LLM) were also investigated. The results showed that fishbone could transit from/to LLM and even trigger tearing modes (TMs). For non-local transport, key characteristics of enhanced avalanches in the theory of self-organized criticality (SOC) were identified, including high Hurst exponents and large-scale radial propagation. Experimental results revealed a close correlation between NTMs and non-local transport. In addition, studies on ELM mitigation by SMBI have also progressed substantially.

Overview of recent HL-2A experiments

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