Investigations on an improved transmission line for THz DNP-NMR spectroscopy

作者：Cao Yi-Chao; Chen Qiang; Zhang Chen; Song Tao; Huang Jie; Hu Qiao; Liu Di-Wei; Wang Wei^*; Hu Min; Zhong Ren-Bin; Shen Hao

来源：Journal of Infrared and Millimeter Waves, 2019, 38(6): 690-694.

DOI：10.11972/j.issn.1001-9014.2019.06.002

• transmission line
• phase-correcting mirror
• nuclear magnetic resonance
• dynamic nuclear polarization

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 +/- 15 degrees.

• 单位
  电子科技大学