10 kHz repetitive high-resolution TV Thomson scattering on TEXTOR:: Design and performance (invited)
10 kHz repetitive high-resolution TV Thomson scattering on TEXTOR:: Design and performance (invited)
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DOI：
10.1063/1.2219434
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发表时间：
2006-10-01
影响因子：
1.6
通讯作者：
Pospieszczyk, A.
中科院分区：
文献类型：
--
作者：
van der Meiden, H. J.;Varshney, S. K.;Pospieszczyk, A.
2003年底，一台具有高空间分辨率的10 kHz多位置汤姆逊散射诊断仪在德克萨斯托卡马克上投入使用。在工作的初始阶段，可以从激光系统中提取18个脉冲，每个脉冲的重复频率为5 kHz，每个脉冲的能量为12J。低掺杂红宝石棒的安装(2005年春季)导致了一个系统，它可以提供更高的脉冲能量，而且发散比0.7mrad更好，导致汤姆森散射光子探测的巨大改进。此外，一个脉冲中的激光脉冲数量可以扩展到甚至超过30个。当n(E)=2.5×10(19)m(-3)，每个7.5 mm的空间元素时，获得的激光能量大于15J/脉冲，使得测量电子温度和密度分布成为可能，电子温度(T(E))的观测误差为8%，电子密度(n(E))的观测误差为4%。该观察光学系统能够采样全等离子体直径900 mm，120个空间通道，每个7.5 mm，或者160 mm长的边缘弦，其中98个空间通道，每个1.7 mm。该系统最近开始用于物理探索，已用于研究m=2磁岛的结构和等离子体对离轴电子回旋共振加热的响应。(C)2006年美国物理研究所。
In late 2003 a 10 kHz multiposition Thomson scattering diagnostic with high spatial resolution became operational on the TEXTOR tokamak. In the initial phase of operation, one burst of 18 pulses of 12 J each with a repetition rate of 5 kHz could be extracted from the laser system. The installation of a low-dope ruby rod (spring 2005) resulted in a system, which can deliver higher pulse energy and moreover a divergence of better than 0.7 mrad, leading to a big improvement in the detection of Thomson scattering photons. Furthermore, the number of laser pulses in one burst could be extended to even more than 30. The achieved laser energy of more than 15 J/pulse makes it possible to measure electron temperature and density profiles with an observational error of 8% on the electron temperature (T(e)) and 4% on the electron density (n(e)) at n(e)=2.5 X 10(19) m(-3), per spatial element of 7.5 mm. The viewing optics enables sampling of either the full plasma diameter of 900 mm with 120 spatial channels of 7.5 mm each or a 160 mm long edge chord with 98 spatial channels of 1.7 mm each. The system, which has recently become available for physics exploration, has already been used to study the structure of m=2 magnetic islands and the response of the plasma to off-axis electron cyclotron resonance heating. (c) 2006 American Institute of Physics.