High harmonic cusptron device with an inverted structure
- Polytechnic Univ., Farmingdale, NY (United States)
An e-beam driven coherent radiation source operating at high cyclotron harmonic is designed. This device, called inverted cusptron, has a coaxial line configuration structured with both slotted central line and outer conductor. It used a cusp-magnetic field to convert a hollow e-beam produced from an annular thermionic cathode into an e-layer as the radiation source. The advantageous feature of the tube is that the central cylindrical tube of the structure can be used as input-output ports for an amplifier setup. A particle simulation code is developed to study the interaction between the electrons in the e-layer and the mode fields of the tube. The optimum design parameters such as the dimensions of the tube, electron beam energy, and magnetic field in order to obtain the maximum efficiency of the device for the TE{sub 02} 2{pi} mode are determined by the results of simulations. Five harmonics (N = 6, 8, 10, 12, 16) are considered, and the corresponding tube parameters are tabulated. It is found that the efficiency of the tube is insensitive to the relative position between the inner and outer slots. On the other hand, it is strongly dependent on the configuration of the cathode ring. Considering an electron beam produced by a 1/4 ring cathode (i.e. a 90{degree} arc length), the optimum conversion efficiencies of the five tubes are calculated to be 25%, 23%, 16%, 11%, and 9% respectively at an output frequency around 20GHz. The experiment to test the sixteenth harmonic tube has been set up. The preliminary experimental results will also be reported.
- OSTI ID:
- 51797
- Report Number(s):
- CONF-940604-; ISBN 0-7803-2006-9; TRN: IM9524%%265
- Resource Relation:
- Conference: 1994 Institute of Electrical and Electronic Engineers (IEEE) international conference on plasma science, Santa Fe, NM (United States), 6-8 Jun 1994; Other Information: PBD: 1994; Related Information: Is Part Of IEEE conference record -- Abstracts; PB: 252 p.
- Country of Publication:
- United States
- Language:
- English
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