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Axis-encircling electron beam generation using a smooth magnetic cusp for gyrodevices

He, W. and Whyte, C.G. and Rafferty, E.G. and Cross, A.W. and Phelps, A.D.R. and Ronald, K. and Young, A.R. and Robertson, C.W. (2008) Axis-encircling electron beam generation using a smooth magnetic cusp for gyrodevices. Applied Physics Letters, 93 (12). ISSN 0003-6951

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Abstract

The generation of an annular-shaped axis-encircling electron beam using a smooth magnetic cusp was studied through numerical simulations and experiments for harmonic operation of a gyrodevice. Two magnetic coils were used to form a magnetic cusp located just downstream from the velvet cathode of an accelerator diode. An electron beam of current 34 A and voltage 130 kV with an adjustable velocity ratio α up to 1.2 was fully transported to the downstream uniform magnetic field region and used to drive a gyrotron traveling wave amplifier into saturation. (Abstract copied from: http://apl.aip.org/applab/v93/i12)