Electron motion of an annular beam in a low-magnetic-field drift tube

Journal Article · Mon Dec 15 04:00:00 EST 2014 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4904067· OSTI ID:22407934

Wu, Ping; Ye, Hu ^[1]; Tan, Weibing; Sun, Jun; Hu, Chengbao ^[2]

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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 710024 (China)

Foil-less diodes and annular electron beams are widely adopted in high power microwave systems, and the electron beam is usually constrained by a guiding magnetic field to pass through the downstream drift tube and beam-wave interaction region. The electron beam, however, will present obvious radial motion when a low magnetic field is adopted, which will prominently influence the beam transmission and beam-wave interaction. This paper focuses on the radial motion of the electron beam in a low-magnetic-field drift tube. A spatial period is demonstrated with methods of theoretical analysis, single-particle calculations, particle-in-cell simulations, and experiments. The results obtained with different methods show good coherency, indicating that the real spatial period of the electron beam can be predicted by a simple formula which is based on single-particle motion regardless of space-charge effect.

• OSTI ID: 22407934
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 12 Vol. 21; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BEAM TRANSPORT
COMPUTERIZED SIMULATION
DRIFT TUBES
ELECTRON BEAMS
INTERACTIONS
MAGNETIC FIELDS
MICROWAVE RADIATION
SPACE CHARGE