Donaldson, C.R., He, W., Zhang, L., McElhinney, P. , Phelps, A.D.R., Cross, A.W. and Ronald, K. (2012) A W-band Gyro-twa Based on a CUSP Electron Gun and Helically Corrugated Waveguide. In: 2012 Abstracts IEEE International Conference on Plasma Science, Edinburgh, UK, 08-13 Jul 2012, ISBN 9781457721298 (doi: 10.1109/PLASMA.2012.6383943)
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Abstract
The latest experimental results of a W-band (75-110 GHz) gyrotron traveling wave amplifier [1] with a helically corrugated waveguide and cusp electron gun is presented. A waveguide with a helical corrugation on its inner surface has ideal dispersive properties which improve the bandwidth of the amplifier whilst maintaining the already good efficiency of operation [2,3]. The large orbit annular electron beam generated by the cusp electron gun [4] is ideal for driving the beam-wave interaction as the beam interacts resonantly with an optimum eigenwave existing in this particular interaction region. The fast-wave interaction is based on the cyclotron resonance maser. When driven by the electron beam of energy 40 keV and current 1.5A, the amplifier was simulated to output 5-10 kW (CW) with a 3 dB frequency bandwidth of 90-100 GHz and saturated gain of 40 dB. The gyro-TWA system includes a 3-layer microwave window, broadband input coupler and quasi-optical mode converter in the form of a corrugated horn. The electron gun has been designed and simulated [5,6] using both MAGIC and Opera and experimentally tested [7] to show the output of a 1.5 A, 40 Kv electron beam with alpha up to 1.56. Experimental results include electron beam profile, current and velocity ration, the microwave power, profile and bandwidth.
| Item Type: | Conference Proceedings |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | McElhinney, Dr Paul |
| Authors: | Donaldson, C.R., He, W., Zhang, L., McElhinney, P., Phelps, A.D.R., Cross, A.W., and Ronald, K. |
| College/School: | College of Medical Veterinary and Life Sciences > School of Psychology & Neuroscience |
| ISSN: | 0730-9244 |
| ISBN: | 9781457721298 |
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