Theoretical and Experimental Investigation on Intense Sheet Electron Beam Transport With Its Diocotron Instability in a Uniform Magnetic Field

In this paper, the cold-fluid model theory of an intense sheet electron beam is developed to investigate the diocotron instability during its transport in a uniform magnetic field. The model shows that if the magnetic field strength and the beam filling factor are increased separately, the diocotron...

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Bibliographic Details
Published in:IEEE transactions on electron devices 2014-06, Vol.61 (6), p.1643-1650
Main Authors: Ruan, Cunjun, Wang, Shuzhong, Han, Ying, Li, Qingsheng, Yang, Xiudong
Format: Article
Language:English
Subjects:
Beams (radiation)
Cold-fluid model theory
Current measurement
diocotron instability
electron beam measuring and analyzing system (EBMAS)
Electron beams
Electrons
Instability
Magnetic analysis
Magnetic field measurement
Magnetic fields
Magnetic resonance imaging
Magnetic tunneling
Mathematical models
sheet electron beam
Stability
Trajectory
transmission rate
Transport
uniform magnetic field
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Summary:In this paper, the cold-fluid model theory of an intense sheet electron beam is developed to investigate the diocotron instability during its transport in a uniform magnetic field. The model shows that if the magnetic field strength and the beam filling factor are increased separately, the diocotron instability will be suppressed, which extends the sheet-beam transport distance effectively. To verify the above conclusion, a set of complicated instruments, the electron beam measuring and analyzing system (EBMAS), was developed to measure the beam cross section, beam current density, and the 3-D trajectory. The sheet electron beam transport process in a uniform magnetic field with its diocotron instability is investigated on the basis of EBMAS measurements. The measured results agree very well with theoretical calculation and numerical simulation. A sheet-electron-beam tube based on a uniform magnetic field was then manufactured to drive a future W-band sheet-beam klystron (WSBK). Tuning the sheet-beam parameters over a broad range, including a cathode voltage range of 20-82 kV, current range of 0.5-4.27 A, and with a beam cross section of about 10 mm \times\, 0.5 mm, the experimental beam transmission rate is above 98% through a beam tunnel of 100 mm in length.
ISSN:0018-9383
1557-9646
DOI:10.1109/TED.2014.2299286