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Title: Preliminary research on overmoded high-power millimeter-wave Cerenkov generator with dual-cavity reflector in low guiding magnetic field

Abstract

This paper presents preliminary research on a V-band overmoded Cerenkov generator with dual-cavity reflector operating in a low guiding magnetic field. It is found that the fluctuation of the electron envelope in the low guiding magnetic field can be predicted using an equivalent coaxial model of a foilless diode, and a dual-cavity reflector based on the model matching method can provide strong reflection at the front end of the overmoded structures so that any microwave power that leaks into the diode region can be effectively suppressed. Numerical simulations indicate that the control of the beam envelope and the use of the dual-cavity reflector ease generator operation in the low guiding magnetic field. In the experimental research, the fluctuation of the annular electron beam with the outer radius of 7.5 mm measures approximately 0.7 mm, which is in good agreement with the theoretical results. The disturbance caused by power leaking from the overmoded slow wave structure is eliminated by the dual-cavity reflector. With accurate fabrication and assembly processes, an operating frequency of 61.6 GHz is attained by the fifth harmonic heterodyne method, and the output power is measured to be approximately 123 MW by the far-field measurement method at a diode voltage of 445 kV,more » a beam current of 4.45 kA, and under a guiding magnetic field of 1.45 T. The output mode is measured using an array of neon flash bulbs, and the pulse shortening phenomenon is both observed and analyzed.« less

Authors:
;  [1]; ; ; ; ; ; ; ;  [2]
  1. Department of Engineering Physics, Tsinghua University, Beijing 100084 (China)
  2. Science and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi'an, Shaanxi 710024 (China)
Publication Date:
OSTI Identifier:
22489954
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 22; Journal Issue: 12; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BEAM CURRENTS; BULBS; CHERENKOV RADIATION; COMPUTERIZED SIMULATION; DISTURBANCES; ELECTRIC POTENTIAL; ELECTRON BEAMS; FLASH TUBES; FLUCTUATIONS; GHZ RANGE; MAGNETIC FIELDS; MICROWAVE RADIATION; NEON; POWER GENERATION; PULSES; REFLECTION

Citation Formats

Ye, Hu, Wu, Ping, Science and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi'an, Shaanxi 710024, Chen, Changhua, Ning, Hui, Tan, Weibing, Teng, Yan, Shi, Yanchao, Song, Zhimin, Cao, Yibing, and Du, Zhaoyu. Preliminary research on overmoded high-power millimeter-wave Cerenkov generator with dual-cavity reflector in low guiding magnetic field. United States: N. p., 2015. Web. doi:10.1063/1.4937777.
Ye, Hu, Wu, Ping, Science and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi'an, Shaanxi 710024, Chen, Changhua, Ning, Hui, Tan, Weibing, Teng, Yan, Shi, Yanchao, Song, Zhimin, Cao, Yibing, & Du, Zhaoyu. Preliminary research on overmoded high-power millimeter-wave Cerenkov generator with dual-cavity reflector in low guiding magnetic field. United States. https://doi.org/10.1063/1.4937777
Ye, Hu, Wu, Ping, Science and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi'an, Shaanxi 710024, Chen, Changhua, Ning, Hui, Tan, Weibing, Teng, Yan, Shi, Yanchao, Song, Zhimin, Cao, Yibing, and Du, Zhaoyu. 2015. "Preliminary research on overmoded high-power millimeter-wave Cerenkov generator with dual-cavity reflector in low guiding magnetic field". United States. https://doi.org/10.1063/1.4937777.
@article{osti_22489954,
title = {Preliminary research on overmoded high-power millimeter-wave Cerenkov generator with dual-cavity reflector in low guiding magnetic field},
author = {Ye, Hu and Wu, Ping and Science and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi'an, Shaanxi 710024 and Chen, Changhua and Ning, Hui and Tan, Weibing and Teng, Yan and Shi, Yanchao and Song, Zhimin and Cao, Yibing and Du, Zhaoyu},
abstractNote = {This paper presents preliminary research on a V-band overmoded Cerenkov generator with dual-cavity reflector operating in a low guiding magnetic field. It is found that the fluctuation of the electron envelope in the low guiding magnetic field can be predicted using an equivalent coaxial model of a foilless diode, and a dual-cavity reflector based on the model matching method can provide strong reflection at the front end of the overmoded structures so that any microwave power that leaks into the diode region can be effectively suppressed. Numerical simulations indicate that the control of the beam envelope and the use of the dual-cavity reflector ease generator operation in the low guiding magnetic field. In the experimental research, the fluctuation of the annular electron beam with the outer radius of 7.5 mm measures approximately 0.7 mm, which is in good agreement with the theoretical results. The disturbance caused by power leaking from the overmoded slow wave structure is eliminated by the dual-cavity reflector. With accurate fabrication and assembly processes, an operating frequency of 61.6 GHz is attained by the fifth harmonic heterodyne method, and the output power is measured to be approximately 123 MW by the far-field measurement method at a diode voltage of 445 kV, a beam current of 4.45 kA, and under a guiding magnetic field of 1.45 T. The output mode is measured using an array of neon flash bulbs, and the pulse shortening phenomenon is both observed and analyzed.},
doi = {10.1063/1.4937777},
url = {https://www.osti.gov/biblio/22489954}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 12,
volume = 22,
place = {United States},
year = {Tue Dec 15 00:00:00 EST 2015},
month = {Tue Dec 15 00:00:00 EST 2015}
}