The factors determining the evolution of edge-localized modes in plasmas driven by lower hybrid currents

Zhang Xiao; Zang Qing; Wang Yi-feng; Han Xiao-feng; Yang Qing-quan; Xu Shuai; Meng Ling-yi; Huang Jia; Lin Xiao-dong; Wang Ke; Liu Haiqing; Yang Jianhua; Gong Xiangzu

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The factors determining the evolution of edge-localized modes in plasmas driven by lower hybrid currents

机译：确定较低混合电流驱动的等离子体中边缘局部模式演化的因素

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Modulated lower-hybrid waves (LHWs) are injected into the Experimental Advanced Superconducting Tokamak to determine the physical principles responsible for the suppression or mitigation of edge-localized modes (ELMs). There are two cases of modulated-ELM evolution (stable and unstable cases), because of two different modulated pedestal densities. They can be attributed to additional magnetic perturbations induced by the LHWs, similarly to the effect of resonant magnetic perturbations. As regards the case of unstable modulated ELM evolution, the plasma stored energy increases as the LHWs turn on. In contrast, the central line-averaged electron density decreases, which is different from the case of ELM suppression or from the stably modulated case. The effect of LHWs or density 'pump-out' effect can pass across the top of the pedestal region and enter the interior of the density pedestal, causing a decrease in the electron density gradient and its value at the top of the pedestal. Simultaneously, the pressure gradient and edge bootstrap current density increase. For ELM suppression (or for the stable) case, LHWs can couple only with the plasma outside the top region of pedestal, because of the higher top value of density pedestal. Thus, LHWs can pump out the electron density significantly only in the pedestal foot region, producing a larger gradient of electron density pedestal. Statistical analysis of the data indicates that there is a threshold value of the central line-averaged electron density for each of the two modulated ELM cases. Furthermore, the ELM amplitude is modulated by LHWs with a time delay of hundreds of microseconds, which may be further evidence that LHWs have a significant impact on the evolution of ELMs and pedestal structures. All these results imply that there is a significant correlation between the ELM behavior and the electron density profiles modulated by LHWs.

机译：将调制低杂波（LHW）注入先进超导托卡马克实验装置，以确定抑制或缓解边缘局域模（ELM）的物理原理。由于两种不同的调制基座密度，有两种调制ELM演化情况（稳定和不稳定情况）。它们可以归因于LHW引起的附加磁扰动，类似于共振磁扰动的影响。至于不稳定调制ELM演化的情况，等离子体储能随着LHW的开启而增加。相比之下，中心线平均电子密度降低，这与ELM抑制或稳定调制的情况不同。LHWs效应或密度“泵出”效应可穿过基座区域顶部，进入密度基座内部，导致基座顶部的电子密度梯度及其值减小。同时，压力梯度和边缘自举电流密度增加。对于ELM抑制（或稳定）情况，由于密度基座的顶部值较高，LHW只能与基座顶部区域外的等离子体耦合。因此，LHWs只能在基座底部区域显著地泵出电子密度，从而产生更大的电子密度梯度。数据的统计分析表明，对于两种调制ELM情况，中心线平均电子密度都有一个阈值。此外，ELM振幅由LHW调制，延迟数百微秒，这可能进一步证明LHW对ELM和基座结构的演化有重大影响。所有这些结果表明，ELM行为与LHWs调制的电子密度分布之间存在显著的相关性。

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来源
《Plasma physics and controlled fusion》 |2020年第12期|共16页
作者
Zhang Xiao; Zang Qing; Wang Yi-feng; Han Xiao-feng; Yang Qing-quan; Xu Shuai; Meng Ling-yi; Huang Jia; Lin Xiao-dong; Wang Ke; Liu Haiqing; Yang Jianhua; Gong Xiangzu;
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作者单位

Shenzhen Univ Adv Energy Res Ctr Shenzhen 518060 Peoples R China;

Chinese Acad Sci Inst Plasma Phys POB 1126 Hefei 230031 Anhui Peoples R China;

Chinese Acad Sci Inst Plasma Phys POB 1126 Hefei 230031 Anhui Peoples R China;

Chinese Acad Sci Inst Plasma Phys POB 1126 Hefei 230031 Anhui Peoples R China;

Chinese Acad Sci Inst Plasma Phys POB 1126 Hefei 230031 Anhui Peoples R China;

Chinese Acad Sci Inst Plasma Phys POB 1126 Hefei 230031 Anhui Peoples R China;

Chinese Acad Sci Inst Plasma Phys POB 1126 Hefei 230031 Anhui Peoples R China;

Chinese Acad Sci Inst Plasma Phys POB 1126 Hefei 230031 Anhui Peoples R China;

Shenzhen Univ Adv Energy Res Ctr Shenzhen 518060 Peoples R China;

Shenzhen Univ Adv Energy Res Ctr Shenzhen 518060 Peoples R China;

Chinese Acad Sci Inst Plasma Phys POB 1126 Hefei 230031 Anhui Peoples R China;

Chinese Acad Sci Inst Plasma Phys POB 1126 Hefei 230031 Anhui Peoples R China;

Chinese Acad Sci Inst Plasma Phys POB 1126 Hefei 230031 Anhui Peoples R China;

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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;
关键词
lower hybrid radio frequency; edge-localized modes; H-mode; tungsten divertor; pedestal;

机译：较低的混合射频;边缘局部模式;H模式;钨方位器;基座;

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2. Model on L-to H-Mode Transition Driven with Lower-Hybrid Wave [J] . QIU Xiaoming(X.M.Qiu), BAI Lin(L.Bai) 中国物理快报：英文版 . 1994,第011期
3. A Simulation of the Effect of Collisional Dissipation of Fast Electrons on the Radial Profiles of the Current Driven by Lower-Hybrid-Waves on the HT-7 Tokamak [J] . 李德徽, 匡光力, 王少杰等离子体科学和技术：英文版 . 2009,第006期
4. A Simulation of the Effect of Collisional Dissipation of Fast Electrons on the Radial Profiles of the Current Driven by Lower-Hybrid-Waves on the HT-7 Tokamak [J] . LI Dehui, KUANG Guangli, WANG Shaojie 等离子体科学和技术（英文版） . 2009,第006期
5. Effect of Wave Accessibility on Lower Hybrid Wave Current Drive in Experimental Advanced Superconductor Tokamak with H-Mode Operation [J] . LI Xin-Xia, XIANG Nong, GAN Chun-Yun 中国物理快报：英文版 . 2015,第003期
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机译：在HT-7托卡马克上较低混合电流驱动的等离子体中，在锯齿波斜坡阶段了解m = 1模式
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机译：在WT-3托卡马克中通过电子回旋加速器加热抑制较低混合电流驱动等离子体中的压力驱动m = 1模式
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9. EFFECTS OF SHEARED POLOIDAL FLOW AND LOWER HYBRID WAVE DRIVEN H MODE IN TOKAMAK PLASMAS [C] . Qingdi GAO, Lin BAI, Xiaodong PENG, International conference on plasma physics and controlled nuclear fusion research . 1996

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10. Active Feedback Control of MHD Modes and Plasma Rotation Using Currents Driven from a Bias Electrode Array [D] . Brooks, John Whitlock. 2020

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12. Suppression of a pressure driven m=1 mode in a lower hybrid current drive plasma by electron cyclotron heating in the WT-3 tokamak [O] . Yoshimura S, Watanabe M, Tanabe K, 2000

机译：在WT-3托卡马克中通过电子回旋加速器加热抑制较低混合电流驱动等离子体中的压力驱动m = 1模式
13. Current-Driven Lower Hybrid Waves at the Inner Edge of the Ring Current [R] . LaBelle, J., Treumann, R. A. 1987

机译：环电流内缘的电流驱动的低杂波

The factors determining the evolution of edge-localized modes in plasmas driven by lower hybrid currents

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