Alfvenic fluctuations measured by in-vessel Mirnov coils at the Wendelstein 7-X stellarator

Rahbarnia K.; Thomsen H.; Schilling J.; Vaz Mendes S.; Endler M.; Kleiber R.; Koenies A.; Borchardt M.; Slaby C.; Bluhm T.; Zilker M.; Carvalho B. B.

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Alfvenic fluctuations measured by in-vessel Mirnov coils at the Wendelstein 7-X stellarator

机译：在WENDELSTEIN 7-X Stertarator上通过船内MIRNOV线圈测量的敏感波动

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The magnetic diagnostic system at the optimized stellarator experiment Wendelstein 7-X (W7-X) includes a total number of 125 Mirnov coils, which are mounted at the inner plasma vessel wall. A wide range of expected signal amplitudes, frequencies and mode numbers is covered to account for the complex three-dimensional geometry of W7-X. The performed amplitude and phase calibration of individual coils including all relevant data acquisition system components allows a detailed spectral and mode analysis. The damped multiple signal classification method and stochastic system identification techniques are shortly described and applied. Two observations are emphasized within this work. Firstly, independent of magnetic configuration and heating scenario (electron cyclotron resonance heating and/or neutral beam injection), broadband fluctuations around 180 kHz have been measured. The nature of these fluctuations is possibly associated with ellipticity-induced Alfven eigenmodes in the outer regions of the plasma. The latter was inferred by studying corresponding theoretically predicted Alfven continua calculated with the 3D-MHD continuum code CONTI. Secondly, fast collapses of plasma current and energy, which occurred during recent operational phases at W7-X, show a clear magnetic signature. Short time scale Alfvenic bursts are revealed, which are induced during these sawtooth-like collapses.

机译：优化恒星实验温德尔斯坦7-X（W7-X）的磁诊断系统包括总共125个米尔诺夫线圈，安装在等离子体容器内壁。涵盖了广泛的预期信号振幅、频率和模式数，以解释W7-X的复杂三维几何结构。包括所有相关数据采集系统组件在内的单个线圈的振幅和相位校准允许进行详细的光谱和模式分析。简要介绍了阻尼多信号分类方法和随机系统辨识技术。这项工作强调了两个观察结果。首先，独立于磁结构和加热场景（电子回旋共振加热和/或中性束注入），测量了180 kHz左右的宽带波动。这些涨落的性质可能与等离子体外部区域由椭圆诱导的阿尔芬本征模有关。后者是通过研究用3D-MHD连续体程序CONTI计算的相应理论预测阿尔芬连续体推断出来的。其次，在W7-X最近的运行阶段，等离子体电流和能量的快速崩塌显示出明显的磁特征。在这些锯齿状崩塌过程中，我们发现了短时间尺度的阿尔弗雷德爆发。

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来源
《Plasma physics and controlled fusion》 |2021年第1期|共12页
作者
Rahbarnia K.; Thomsen H.; Schilling J.; Vaz Mendes S.; Endler M.; Kleiber R.; Koenies A.; Borchardt M.; Slaby C.; Bluhm T.; Zilker M.; Carvalho B. B.;
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作者单位

Max Planck Inst Plasma Phys Wendelsteinstr 1 D-17491 Greifswald Germany;

Max Planck Inst Plasma Phys Wendelsteinstr 1 D-17491 Greifswald Germany;

Max Planck Inst Plasma Phys Wendelsteinstr 1 D-17491 Greifswald Germany;

Max Planck Inst Plasma Phys Wendelsteinstr 1 D-17491 Greifswald Germany;

Max Planck Inst Plasma Phys Wendelsteinstr 1 D-17491 Greifswald Germany;

Max Planck Inst Plasma Phys Wendelsteinstr 1 D-17491 Greifswald Germany;

Max Planck Inst Plasma Phys Wendelsteinstr 1 D-17491 Greifswald Germany;

Max Planck Inst Plasma Phys Wendelsteinstr 1 D-17491 Greifswald Germany;

Max Planck Inst Plasma Phys Wendelsteinstr 1 D-17491 Greifswald Germany;

Max Planck Inst Plasma Phys Wendelsteinstr 1 D-17491 Greifswald Germany;

Max Planck Inst Plasma Phys Wendelsteinstr 1 D-17491 Greifswald Germany;

Inst Super Tecn Inst Plasmas &

Fusao Nucl Lisbon Portugal;

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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
stellarator; magnetic fluctuations; Mirnov coils; mode analysis;

机译：螺栓磨机;磁波动;mirnov线圈;模式分析;

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外文文献
专利

1. Other Projects：SMBI Experiments in the Wendelstein 7-AS Stellarator [J] . YAOLianghua, J.Baldzuhn 核工业西南物理研究院年报：英文版 . 2003,第001期
2. Experiments on Gas Jet in the Wendelstein 7-AS Stellarator [J] . Yao Lianghua(姚良骅), J.Baldzuhn 等离子体科学和技术（英文版） . 2003,第005期
3. Numerical estimate of multi-species ion sound speed of Langmuir probe interpretations in the edge plasmas of Wendelstein 7-X [J] . J COSFELD, P DREWS, B BLACKWELL, 等离子体科学和技术（英文版） . 2020,第008期
4. Spectroscopic studies of fuel recycling and impurity behaviors in the divertor region of Wendelstein 7-X [J] . Yanling WEI, Lukas RUDISCHHAUSER, Michael ENDLER, 等离子体科学和技术（英文版） . 2019,第010期
5. Probe manipulators for Wendelstein 7-X and their interaction with the magnetic topology [J] . M RACK, Y LIANG, M HUBENY, 等离子体科学和技术（英文版） . 2018,第005期
6. Production management and quality assurance for the fabrication of the In-Vessel Components of the stellarator Wendelstein 7-X [J] . C. Li, J. Boscary, N. Dekorsy, Fusion Engineering and Design . 2014,第7a8期

机译：恒星飞机Wendelstein 7-X的船内组件制造的生产管理和质量保证
7. The procurement and testing of the stainless steel in-vessel panels of the Wendelstein 7-X Stellarator [J] . A.Peacock, A.Girlinger, A. Vorkoeper, Fusion Engineering and Design . 2011,第9a11期

机译：Wendelstein 7-X Stellarator的不锈钢内装板的采购和测试
8. Thermal analysis of the Mirnov coils of Wendelstein 7-X [J] . M.Y. Ye, X.B. Peng, L. Fransico, Fusion Engineering and Design . 2013,第9a10期

机译：Wendelstein 7-X的Mirnov线圈的热分析
9. Purpose and design of trim coils for the Wendelstein 7-X stellarator experiment [C] . Risse K., Kisslinger J., Freundt S., 2011 IEEE/NPSS 24th Symposium on Fusion Engineering . 2011

机译：Wendelstein 7-X恒星仪实验的微调线圈的用途和设计
10. 3D Plasma Edge Transport and Radiative Power Exhaust in Wendelstein 7-X Limiter and Island Divertor Scenarios =3D Plasmarandschichttransport und Strahlungskühlung in Wendelstein 7-X Limiter- und Inseldivertorszenarien [D] . Effenberg, Florian. 2018

机译：3d等离子体边缘运输和瓦登斯坦7-X Limiter和Island Devertor情景中的散热速度= Wendelstein 7-X Limiter和Island Viverts情景中的3D Plasmarandschiptransport和辐射冷却
11. Erratum: Confirmation of the topology of the Wendelstein 7-X magnetic field to better than 1:100000 [O] . T. Sunn Pedersen, M. Otte, S. Lazerson, -1

机译：勘误：确认Wendelstein 7-X磁场的拓扑优于1：100000
12. Production management and quality assurance for the fabrication of the In-vessel components of the stellarator Wendelstein 7-X [O] . Li, C., Boscary, J., Dekorsy, N., 2014

机译：制造防盗器Wendelstein 7-X的容器内部件的生产管理和质量保证
13. Vacuum Magnetic Field and Modular Coil System of the Advanced Stellarator Wendelstein VII-AS [R] . Rau, F., Kisslinger, J., Wobig, H. 1982

机译：高级仿星机Wendelstein VII-as的真空磁场和模块化线圈系统

Alfvenic fluctuations measured by in-vessel Mirnov coils at the Wendelstein 7-X stellarator

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