Fast pulsed radar reflectometry for the Textor Tokamak
Fast pulsed radar reflectometry for the Textor Tokamak
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用于 Textor 托卡马克的快速脉冲雷达反射计
DOI：
10.1063/1.1149426
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发表时间：
1999
影响因子：
1.6
通讯作者：
G. Ermak
中科院分区：
文献类型：
--
作者：
C. Hugenholtz;A. Donne;B. Elzendoorn;J. V. Gorkom;W. Kooijman;H. V. D. Laan;M. J. V. D. Pol;A. Putter;H. J. F. V. Ramele;D. Smit;P. Vries;F. Wijnoltz;W. Pysik;G. Waidmann;G. Ermak
聚变研究的进展表明，为了研究聚变等离子体中的小而快的现象，对具有高时间和空间分辨率的诊断的需求越来越大。因此，正在为TEXTOR托卡马克研制一种新的十通道脉冲雷达反射计，以在2 MHz的高重复频率下测量0.4-4×1019 m−3范围内的电子密度分布。这种诊断的另一个特点是可以在10 MHz重复率下进行相关测量，以研究密度波动。反射计将在18-57 GHz范围内用1 ns长的雷达脉冲扫描等离子体。尽管脉冲的飞行时间很长，约为100 ns，但上述高重复率可以通过对雷达脉冲的产生和接收进行时分复用来实现。接收脉冲的时间选择是由外差接收机的本振输入的快速切换来执行的，以产生时间窗口，在该时间窗口中，反射信号的接收…
Progress in fusion research shows an increasing demand for diagnostics with high temporal and spatial resolution in order to study small and fast phenomena in fusion plasmas. Therefore, a new ten-channel pulsed radar reflectometer is under development for the TEXTOR Tokamak, to measure electron density profiles in the range of 0.4–4×1019 m−3 at a high repetition rate of 2 MHz. An additional feature of this diagnostic is the possibility to perform correlation measurements at 10 MHz repetition rate to investigate density fluctuations. The reflectometer will scan the plasma with 1-ns-long radar pulses in the 18–57 GHz range. In spite of the long flight time of the pulses of about 100 ns, the above mentioned high repetition rates could be achieved by time multiplexing the generation and reception of the radar pulses. Temporal selection of the received pulses is performed by fast switching of the local oscillators inputs of the heterodyne receiver, to generate time windows in which the reception of the reflect...