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Author Ye, Hu ♦ Wu, Ping ♦ Chen, Changhua ♦ Ning, Hui ♦ Tan, Weibing ♦ Teng, Yan ♦ Shi, Yanchao ♦ Song, Zhimin ♦ Cao, Yibing ♦ Du, Zhaoyu
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword 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
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, 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.
ISSN 1070664X
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-12-15
Publisher Place United States
Journal Physics of Plasmas
Volume Number 22
Issue Number 12


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