Conformal Cross-Flow Axis-Encircling Electron Beam for Driving THz Harmonic Gyrotron

In a magnetic cusp gun, the canonical-angular-momentum (CAM) spread of the initially emitted electrons is crucial in generating substantial beam velocity spread. A new method called electron beam flow-feature compensation is proposed to build an axis-encircling electron beam with zero velocity sprea...

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Bibliographic Details
Published in:IEEE electron device letters 2015-09, Vol.36 (9), p.960-962
Main Authors: Du, Chao-Hai, Qi, Xiang-Bo, Hao, Bao-Liang, Chang, Tsun-Hsu, Liu, Pu-Kun
Format: Article
Language:English
Subjects:
axis-encircling electron beam
Cathodes
Cavity resonators
Computer aided manufacturing
Electron beams
Electron cyclotron maser
Gyrotrons
harmonic operation
Magnetic fields
Trajectory
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Summary:In a magnetic cusp gun, the canonical-angular-momentum (CAM) spread of the initially emitted electrons is crucial in generating substantial beam velocity spread. A new method called electron beam flow-feature compensation is proposed to build an axis-encircling electron beam with zero velocity spread by optimizing the cross-flow trajectories to compensate for the initial CAM spread. This method provides an effective solution to the velocity-spread problem in terahertz gyrotrons and increases the emission current to a level that is several times higher than the level that can be obtained using current technology.
ISSN:0741-3106
1558-0563
DOI:10.1109/LED.2015.2460457