New Thomson scattering diagnostic on RFX-mod.
New Thomson scattering diagnostic on RFX-mod.
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DOI：
10.1063/1.2431769
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发表时间：
2007-01
期刊：
影响因子：
--
通讯作者：
A. Alfier;R. Pasqualotto
中科院分区：
文献类型：
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作者：
A. Alfier;R. Pasqualotto
本文介绍了自2005年改型反场实验（RFX-mod）重新投入使用以来，对汤姆逊散射（TS）诊断系统进行的全面改造。该系统沿着赤道直径测量等离子体电子温度和密度分布，测量84个位置，空间分辨率为7毫米。定制的Nd:YLF激光器在50 Hz下产生10个脉冲，能量为3 J，在持续约300 ms的等离子体放电中提供10个剖面测量。光延迟系统可容纳28个干涉滤光光谱仪中的每一个中的三个散射体。雪崩光电二极管检测汤姆逊散射信号，并允许它们被记录的手段波形数字化。利用一种基于超连续介质光源的相对校准方法获得了电子温度。氮中的旋转拉曼散射为电子密度测量提供了绝对校准。在2005年的RFX-mod实验活动中，TS诊断已经证明了它的性能，通常提供可靠的高分辨率剖面。
This article describes the completely renovated Thomson scattering (TS) diagnostic employed in the modified Reversed Field eXperiment (RFX-mod) since it restarted operation in 2005. The system measures plasma electron temperature and density profiles along an equatorial diameter, measuring in 84 positions with 7 mm spatial resolution. The custom built Nd:YLF laser produces a burst of 10 pulses at 50 Hz with energy of 3 J, providing ten profile measurements in a plasma discharge of about 300 ms duration. An optical delay system accommodates three scattering volumes in each of the 28 interference filter spectrometers. Avalanche photodiodes detect the Thomson scattering signals and allow them to be recorded by means of waveform digitizers. Electron temperature is obtained using an alternative relative calibration method, based on the use of a supercontinuum light source. Rotational Raman scattering in nitrogen has supplied the absolute calibration for the electron density measurements. During RFX-mod experimental campaigns in 2005, the TS diagnostic has demonstrated its performance, routinely providing reliable high resolution profiles.