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Experimental research based on a C-band compact transit-time oscillator with a novel diode loading an embedded soft magnetic material and shielding structure

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Chinese Physics B 2023年第7期32卷 428-434页

作者：何宇放贺军涛令钧溥王蕾宋莉莉 College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China

In order to reduce the external magnetic field and improve the conversion efficiency of high-power microwave generation devices with low external magnetic field,a novel diode with an embedded soft magnetic and shielding structure is *** soft magnetic material is designed to enhance the local magnetic field in the diode ***,the diode applies a shielding structure which can reduce the radial electric *** simulation research,it is found that the emission and transmission quality of the electron beam with low magnetic field is greatly improved when loading this *** simulation research,it is verified that the diode can increase the conversion efficiency of the transit-time oscillator(TTO)from 30%to 36.7%.In our experimental study,under the conditions of a diode voltage of 540 kV and a current of 10.5 kA,the output microwave power is 1.51 GW when loading the novel diode and the microwave frequency is 4.27 GHz when an external guiding magnetic field of 0.3 T is *** corresponding conversion efficiency is improved from 20.0%to 26.6%,which is 6.6%higher than that of a device loaded with a conventional *** experiments have verified that this novel diode can effectively improve the conversion efficiency of high-power microwave sources operating with low magnetic field,and contribute to the miniaturization and compactness of high-power microwave devices.

关键词： high-power microwave soft magnetic material shielding structure transit-time oscillator

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Study on cosmogenic radioactive production in germanium as a background for future rare event search experiments

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Nuclear Science and Techniques 2020年第6期31卷 22-29页

作者： Yu-Lu Yan Wei-Xin Zhong Shin-Ted Lin Jing-Jun Zhu Chen-Kai Qiao Lei Zhang Yu Liu Qian Yue Hao-Yang Xing Shu-Kui Liu College of Physics Sichuan UniversityChengdu 610064China School of Physics Nankai UniversityTianjin 30071China Institute of Nuclear Science and Technology Sichuan UniversityChengdu 610065China Department of Engineering Physics Tsinghua UniversityBeijing 100084China

Rare event search experiments are one of the most important topics in the field of fundamental physics,and high-purity germanium(HPGe)detectors with an ultralow radioactive background are frequently used for such ***,cosmogenic activation contaminates germanium crystals during transport and *** this study,we investigated the movable shielding containers of HPGe crystals using Geant4 and CRY Monte Carlo *** production rates of 68Ge,65Zn,60Co,55Fe,and 3H were obtained individually for different types of cosmic *** validity of the simulation was confirmed through a comparison with the available experimental *** on this simulation,we found that the interactions induced by neutrons contribute to approximately 90%of the production rate of cosmogenic *** addition,by adding an optimized shielding structure,the production rates of cosmogenic radionuclides are reduced by about one order of *** results show that it is feasible to use a shielding container to reduce the cosmogenic radioactivity produced during the transport and storage of high-purity germanium on the ground.

关键词： High-purity germanium shielding structure Geant4 Transportation

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