Experimental investigations on density bunching and its power influence in a relativistic backward-wave oscillator with low-magnetic-field operation

In a relativistic backward-wave oscillator operating at a low magnetic field, forward intense relativistic electron beams propagate with large transverse velocities and form a non-uniform beam-density distribution. This paper first investigates periodical density bunching by bombarding targets with...

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Bibliographic Details
Published in:Physics of plasmas 2020-06, Vol.27 (6)
Main Authors: Wang, Huida, Xiao, Renzhen, Chen, Changhua, Shi, Yanchao
Format: Article
Language:English
Subjects:
Bunching
C band
Density distribution
Drift tubes
Electrons
Particle in cell technique
Plasma physics
Relativistic effects
Relativistic electron beams
Standing waves
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Summary:In a relativistic backward-wave oscillator operating at a low magnetic field, forward intense relativistic electron beams propagate with large transverse velocities and form a non-uniform beam-density distribution. This paper first investigates periodical density bunching by bombarding targets with electron beams in a relativistic drift tube. Then, the dependence of the density-bunching phase on interaction efficiency is studied experimentally for the first time with a C-band relativistic backward-wave oscillator. The results show a reduction in microwave power of over 40%, arising from a mismatch between the density-bunching phase and the standing-wave field in the resonant reflector, which is in reasonable agreement with particle-in-cell simulation results.
ISSN:1070-664X
1089-7674
DOI:10.1063/5.0011898