RFX-mod设备边缘等离子体中的等离子体密度波动通过气体抽吸成像诊断进行测量。信号的统计特征量化的概率分布函数(PDF),并计算几种放电。发现来自没有特定控制方法的放电的PDF由伽马函数充分描述,与Graves等人的最近结果一致[J. P. Graves等人,Plasma Phys. Control. Fusion 47,L1(2005)]。另一方面,用于等离子体控制的外部方法的脉冲具有修改的PDF。第一个实证分析表明,它们可以通过简单函数的线性组合进行插值。文献的检查表明,这种PDF是常见的其他设备,以及,并已被建议是由于同时存在不同的机制,分别驱动相干爆发和高斯背景湍流。尝试将PDF中的差异与血浆条件(诸如血浆柱的局部移位)相关联。一个简单的唯象模型来解释PDF的性质,并赋予其参数的意义。
英文摘要:
Plasma density fluctuations in the edge plasma of the RFX-mod device are measured through the Gas Puffing Imaging Diagnostics. Statistical features of the signal are quantified in terms of the Probability Distribution Function (PDF), and computed for several kinds of discharges. The PDFs from discharges without particular control methods are found to be adequately described by a Gamma function, consistently with the recent results by Graves et al [J.P. Graves, et al, Plasma Phys. Control. Fusion 47, L1 (2005)]. On the other hand, pulses with external methods for plasma control feature modified PDFs. A first empirical analysis suggests that they may be interpolated through a linear combination of simple functions. An inspection of the literature shows that this kind of PDFs is common to other devices as well, and has been suggested to be due to the simultaneous presence of different mechanisms driving respectively coherent bursts and gaussian background turbulence. An attempt is made to relate differences in the PDFs to plasma conditions such as the local shift of the plasma column. A simple phenomenological model to interpret the nature of the PDF and assign a meaning to its parameters is also developed.
本文利用TRB流体静电湍流程序研究了RFX-mod反向场箍缩(Reversed Field Pinch,RFP)准单螺旋区离子温度梯度漂移湍流的稳定性。我们的研究结果表明,目前的RFP等离子体对这种湍流是勉强稳定的。的不稳定性的发病可能会设想为密切的未来制度,在存在更热的等离子体与尖锐的内部传输障碍。
现今的反向场箍缩(Reversed Field Pinches,RFPs)的特征是其核心的准层状磁结构,其边界具有尖锐的内部输运势垒,类似于托卡马克和仿星器。磁混沌的减弱导致伴随粒子和热沿漂移磁力线输运的减少。同时,陡峭的温度梯度的增长可能触发漂移微不稳定性。在这项工作中,我们总结了最近在RFP RFX-mod中所做的工作,以评估离子温度梯度(ITG),陷阱电子模式(TEM)和微撕裂模式等静电和电磁微不稳定性的存在和对运输的影响。
Updated electrical design of the Diagnostic Neutral Beam Injector in RFX-mod2
CNR, Istituto per la Scienza e la Tecnologia dei Plasmi (ISTP)(意大利国家研究委员会等离子体科学与技术研究所);Consorzio RFX(RFX联盟);Università di Padova(帕多瓦大学);Università degli Studi di Padova, Centro Ricerche Fusione (CRF)(帕多瓦大学聚变研究中心)
Real-time feedback control of ELM frequency using divertor gas puffing and its effects on tungsten-induced radiation and plasma performance in KSTAR
Princeton University(普林斯顿大学);Korea Institute of Fusion Energy (KFE)(韩国聚能研究所);Princeton Plasma Physics Laboratory(普林斯顿等离子体物理实验室);Korea Advanced Institute of Science and Technology (KAIST)(韩国科学技术院)
Multi-Machine Scaling Laws for Fuel and Impurity Puffing Rates Sufficient for Detachment Access: a Systematic Review of Magnetic Confinement Fusion Devices
Gauss Fusion GmbH(高斯聚变有限公司);United Kingdom Atomic Energy Authority(英国原子能管理局);Max-Planck-Institut für Plasmaphysik(马克斯·普朗克等离子体物理研究所);EUROfusion Consortium(欧洲聚变联盟);Karlsruhe Institute of Technology(卡尔斯鲁厄理工学院)
Two-fluid boundary turbulence simulations in reversed field pinch plasmas
University of Padua(帕多瓦大学);Consorzio RFX (CNR, ENEA, INFN, Università di Padova, Acciaierie Venete SpA)(RFX联盟(意大利国家研究委员会、国家新能源研究中心、意大利国家核物理研究所、帕多瓦大学、威尼斯钢铁公司));Istituto per la Scienza e la Tecnologia dei Plasmi (ISTP), CNR(等离子体科学与技术研究所,意大利国家研究委员会)