Donaldson, C. R. and He, W. and Cross, A.W. and Li, Fengping and Phelps, A.D.R. and Zhang, Liang and Ronald, Kevin and Robertson, Craig and Whyte, Colin and Young, Alan (2010) A cusp electron gun for millimeter wave gyrodevices. Applied Physics Letters, 96 (14). p. 141501. ISSN 0003-6951
The experimental results of a thermionic cusp electron gun, to drive millimeter and submillimeter wave harmonic gyrodevices, are reported in this paper. Using a "smooth" magnetic field reversal formed by two coils this gun generated an annular-shaped, axis-encircling electron beam with 1.5 A current, and an adjustable velocity ratio alpha of up to 1.56 at a beam voltage of 40 kV. The beam cross-sectional shape and transported beam current were measured by a witness plate technique and Faraday cup, respectively. These measured results were found to be in excellent agreement with the simulated results using the three-dimensional code MAGIC.
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