Relationship of edge localized mode burst times with divertor flux loop signal phase in JET
Relationship of edge localized mode burst times with divertor flux loop signal phase in JET
复制标题
JET 中边缘局部模式突发时间与偏滤器磁通环路信号相位的关系
DOI：
--
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
J. Contributors
中科院分区：
文献类型：
--
作者：
S. Chapman;R. Dendy;T. Todd;N. Watkins;A. Webster;F. A. Calderón;J. Morris;J. Contributors
一个相位关系确定之间的顺序边缘局域模（ELMs）发生时间在一组H-模式托卡马克等离子体的偏滤器区域的全通量方位环中测量的电压。我们专注于等离子体在欧洲联合环的一个稳定的H-模式持续了几秒钟，在此期间，ELMs被观察到在偏滤器的Be II发射。分析的ELM来自内在ELMing，即没有通过外部手段控制ELMing过程的故意意图。我们使用ELM的定时来自Be II信号进行直接的时域分析的全通量回路VLD 2和VLD 3信号，这提供了一个高节奏的全球测量成比例的极向磁通量的变化引起的电压。具体来说，我们研究如何连续ELMs对之间的时间间隔是链接到全通量回路信号的时间演变阶段。每个ELM在全通量回路信号中产生清晰的早期脉冲，其峰值时间用于调节我们的分析。以下ELM的到达时间，相对于这个脉冲，被发现属于两个类别之一：（i）提示ELM，这是直接起搏的初始响应中看到的通量回路信号;和（ii）所有其他ELM，这发生在初始响应的全通量回路信号已经衰减的幅度。相对于该对中的第一ELM，类别（ii）中的ELM发生的时间被聚集在全通量回路信号的瞬时相位接近其在第一ELM时的值的时间。
A phase relationship is identified between sequential edge localized modes (ELMs) occurrence times in a set of H-mode tokamak plasmas to the voltage measured in full flux azimuthal loops in the divertor region. We focus on plasmas in the Joint European Torus where a steady H-mode is sustained over several seconds, during which ELMs are observed in the Be II emission at the divertor. The ELMs analysed arise from intrinsic ELMing, in that there is no deliberate intent to control the ELMing process by external means. We use ELM timings derived from the Be II signal to perform direct time domain analysis of the full flux loop VLD2 and VLD3 signals, which provide a high cadence global measurement proportional to the voltage induced by changes in poloidal magnetic flux. Specifically, we examine how the time interval between pairs of successive ELMs is linked to the time-evolving phase of the full flux loop signals. Each ELM produces a clear early pulse in the full flux loop signals, whose peak time is used to condition our analysis. The arrival time of the following ELM, relative to this pulse, is found to fall into one of two categories: (i) prompt ELMs, which are directly paced by the initial response seen in the flux loop signals; and (ii) all other ELMs, which occur after the initial response of the full flux loop signals has decayed in amplitude. The times at which ELMs in category (ii) occur, relative to the first ELM of the pair, are clustered at times when the instantaneous phase of the full flux loop signal is close to its value at the time of the first ELM.
影响因子：
8.6
作者：
Schwabedal, Justus T. C.;Pikovsky, Arkady
通讯作者：
Pikovsky, Arkady
识别 JET 等离子体中 I 型边缘局域模式过程中的低维动力学
影响因子：
2.2
作者：
Calderon F
通讯作者：
Calderon F