Low-noise heterodyne receiver for electron cyclotron emission imaging and microwave imaging reflectometry.
Low-noise heterodyne receiver for electron cyclotron emission imaging and microwave imaging reflectometry.
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DOI：
10.1063/1.4959273
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发表时间：
2016-11
期刊：
影响因子：
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通讯作者：
B. Tobias;C. Domier;N. Luhmann;C. Luo;M. Mamidanna;T. Phan;A. Pham;Y. Wang
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文献类型：
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作者：
B. Tobias;C. Domier;N. Luhmann;C. Luo;M. Mamidanna;T. Phan;A. Pham;Y. Wang
使电子回旋发射成像（ECEI）和微波成像反射仪（MIR）能够解决二维和三维电子温度和密度扰动的关键组件是外差成像阵列，它收集并将辐射发射和/或反射信号（50-150 GHz）下变频到中频（IF）频段（例如0.1-18 GHz），该中频（IF）频段可以通过屏蔽同轴电缆传输，以进行进一步滤波和检测。为了完成这一任务，人们开发了新的电路，将砷化镓（GaAs）单片微波集成电路（mmic）集成在液晶聚合物（LCP）衬底上。改进后的拓扑结构显著增加了对带外干扰的电磁屏蔽，使信噪比提高了10倍，并通过集成大幅节省了成本。目前的设计，针对中型托卡马克的反射测量和边缘辐射测量进行了优化，在上v波段（60-75 GHz）已经证明了bbb20 dB的转换增益。在多通道电子回旋发射成像（ECEI）阵列中实现该电路将提高对边缘局域模式和高约束或h模式基座波动的诊断。
The critical component enabling electron cyclotron emission imaging (ECEI) and microwave imaging reflectometry (MIR) to resolve 2D and 3D electron temperature and density perturbations is the heterodyne imaging array that collects and downconverts radiated emission and/or reflected signals (50-150 GHz) to an intermediate frequency (IF) band (e.g. 0.1-18 GHz) that can be transmitted by a shielded coaxial cable for further filtering and detection. New circuitry has been developed for this task, integrating gallium arsenide (GaAs) monolithic microwave integrated circuits (MMICs) mounted on a liquid crystal polymer (LCP) substrate. The improved topology significantly increases electromagnetic shielding from out-of-band interference, leads to 10× improvement in the signal-to-noise ratio, and dramatic cost savings through integration. The current design, optimized for reflectometry and edge radiometry on mid-sized tokamaks, has demonstrated >20 dB conversion gain in upper V-band (60-75 GHz). Implementation of the circuit in a multi-channel electron cyclotron emission imaging (ECEI) array will improve the diagnosis of edge-localized modes and fluctuations of the high-confinement, or H-mode, pedestal.