Improvements to the Faraday cup fast ion loss detector and magnetohydrodynamic induced fast ion loss measurements in Joint European Torus plasmas.
Improvements to the Faraday cup fast ion loss detector and magnetohydrodynamic induced fast ion loss measurements in Joint European Torus plasmas.
复制标题
改进了欧洲联合环面等离子体中的法拉第杯快速离子损失检测器和磁流体动力学诱导的快速离子损失测量。
DOI：
10.1063/5.0014278
复制
发表时间：
2020
期刊：
影响因子：
--
通讯作者：
M. Podestà
中科院分区：
文献类型：
--
作者：
P. Bonofiglo;V. Kiptily;A. Horton;P. Beaumont;R. Ellis;F. E. Cecil;M. Podestà
JET薄箔法拉第杯快速离子损失探测器的电子硬件和探测器设计已经进行了升级[Darrow等人，Rev. Sci]。仪器。75,3566(2004)]在即将到来的氘-氚（DT）运动的预期。一种改进的箔堆设计已经实施，这大大减少了箔到箔的短路数量，三轴电缆已经减轻了环境噪声。与最初的5 kHz数字化仪相比，200 kHz数字化仪的初步测试提供了增强的分析技术和磁流体动力学活动的快速离子损失的直接相干测量。我们介绍了最近在JET氘等离子体中与扭结模式、鱼骨模式、边缘局域模式和锯齿相关的损耗测量。讨论了系统噪声的来源，重点讨论了电容式等离子体拾取。总的来说，系统升级已经建立了一种能够记录由于各种共振快速离子传输机制而导致的α粒子损失的诊断方法，可用于未来的dt实验和建模工作。
Upgrades to electronic hardware and detector design have been made to the JET thin-foil Faraday cup fast ion loss detector [Darrow et al., Rev. Sci. Instrum. 75, 3566 (2004)] in anticipation of the upcoming deuterium-tritium (DT) campaign. An improved foil stack design has been implemented, which greatly reduces the number of foil-to-foil shorts, and triaxial cabling has mitigated ambient noise pickup. Initial tests of 200 kHz digitizers, as opposed to the original 5 kHz digitizers, have provided enhanced analysis techniques and direct coherence measurements of fast ion losses with magnetohydrodynamic activity. We present recent loss measurements in JET deuterium plasmas correlated with kink modes, fishbone modes, edge-localized modes, and sawteeth. Sources of systematic noise are discussed with emphasis on capacitive plasma pickup. Overall, the system upgrades have established a diagnostic capable of recording alpha particle losses due to a wide variety of resonant fast ion transport mechanisms to be used in future DT-experiments and modeling efforts.