Broadband electron cyclotron emission radiometry for the Large Helical Device
Broadband electron cyclotron emission radiometry for the Large Helical Device
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DOI：
10.1063/1.1530385
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发表时间：
2003-03-01
影响因子：
1.6
通讯作者：
Ito, Y
中科院分区：
文献类型：
--
作者：
Kawahata, K;Nagayama, Y;Ito, Y
已开发出用于测量电子回旋发射（ECE）光谱的32通道外差辐射计，并将其安装在大型螺旋装置（LHD）上。两个双边带混频器[带镜像抑制滤波器（高通和低通滤波器）的带宽（BW=2-26 GHz）]用于覆盖二次谐波 LHD ECE 的几乎整个光谱范围。每个边带接收器的光谱分辨率为Deltaf = 1.2 GHz，对应于半等离子体半径位置处的1 cm空间分辨率。采用132 GHz的耿氏振荡器作为本地振荡器，因此系统覆盖的频率范围为106-158 GHz，对应于B(0) = 2.82 T的二次谐波ECE。发现系统的高时间分辨率（Deltat类似于1 mu）和优异的信噪比有利于研究与磁流体动力学活动和输运跃迁相关的快速现象。本文将介绍 LHD ECE 诊断仪器的特性和典型实验结果。 (C) 2003 年美国物理研究所。
A 32-channel heterodyne radiometer for the purpose of measuring the electron cyclotron emission (ECE) spectrum, has been developed and installed on the large helical device (LHD). Two double-sideband mixers [bandwidth (BW=2-26 GHz) with image rejection filters (high-pass and low-pass filters)] are used to cover almost the full spectral range of the second harmonic LHD ECE. The spectral resolution of each sideband receiver is Deltaf = 1.2 GHz, which corresponds to a spatial resolution of 1 cm at the position of the half plasma radius. A Gunn oscillator at 132 GHz is used as a local oscillator, so the frequency range covered by the system is 106-158 GHz, which corresponds to the second harmonic ECE for B (0) = 2.82 T. It is found that the high temporal resolution (Deltat similar to 1 mus) of the system with excellent signal-to-noise ratio is favorable for studying fast phenomena related to the magnetohydrodynamic activities and transport transitions. In this article, the properties of the diagnostic instrument and typical experimental results of the LHD ECE will be presented. (C) 2003 American Institute of Physics.