Investigations on an improved transmission line for THz DNP-NMR spectroscopy
投稿时间:2018-05-15  修订日期:2019-11-14  download
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作者单位邮编
CAO Yi-Chao School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China 610054
CHEN Qiang  
ZHANG Chen  
SONG Tao  
HUANG Jie  
HU Qiao  
LIU Di-Wei School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China 
WANG Wei  
HU Min  
ZHONG Ren-Bin School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China 
SHEN Hao  
Abstract:The improved transmission and mirror system for a 263 GHz DNP-NMR spectrometer has been designed and numerically simulated based on the geometric optics theory and the vector diffraction theory. The system includes two corrugated waveguides, a parabolic mirror and an angle-adjustable phase-correcting mirror. The simulation results show that a well-focused Gaussian-like output wave-beam with 99.90% scalar Gaussian mode content, 99.55% vector Gaussian mode content has been obtained. The direction of the output beam can be changed by only adjusting the angle of the phase-correcting mirror to match the DNP-NMR sample. The scalar Gaussian mode content is about 99.57%, and the vector Gaussian mode content is about 98.97% when the direction of the output beam changes in ± 15o.
keywords:transmission line  phase-correcting mirror  nuclear magnetic resonance  dynamic nuclear polarization.
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Copyright:《Journal of Infrared And Millimeter Waves》