Enhancement of overall efficiency of large-orbit gyrotrons

Amarjit Singh, ; Destler, William W. ; Granatstein, Victor L. ; Hix, William R. (1992) Enhancement of overall efficiency of large-orbit gyrotrons International Journal of Electronics, 72 (5-6). pp. 827-840. ISSN 0020-7217

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Related URL: http://dx.doi.org/10.1080/00207219208925617


Energy recovery from the spent beam in gyrotrons can enhance their overall efficiency. A technique for converting the rotational motion in the spent beam of a large-orbit gyrotron into axial motion, before leading it into a retarding electrostatic field generated by depressed collectors is proposed. This involves passing the spent beam through a magnetic cusp. A proof-of-principle experiment has been performed which verifies the prediction regarding unwinding of the beam, and its collection at a depressed potential which is higher than would otherwise be possible. The experimental set-up and results are presented. A multi-stage depressed collector for a large-orbit gyrotron has also been designed. Primary electrons representing beamlets of a range of energy values are collected at different depressed potentials after energy sorting. Any turning around of primaries before collection has been eliminated and almost all the back-scattered electrons are re-absorbed either on the same collector or on an adjacent one. A collector efficiency of 70 to 80% has been estimated.

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