Long-pulse operation at constant output power and single-frequency mode of a high-power electrostatic free-electron maser with depressed collector

The Fusion Free-Electron Maser (FFF) is the prototype of a high-power, tunable source of mm-wave radiation, for use on fusion plasma devices. In previous experiments a net output power of 730 kW at 206 GHz was generated in short pulses. The present experiment has been equipped with a system to recov...

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Bibliographic Details
Published in:Physical review letters 2002-11, Vol.89 (21), p.214801-214801, Article 214801
Main Authors: Urbanus, W H, Bongers, W A, Bratman, V, Van Der Geer, C A J, Graswinckel, M F, Manintveld, P, Militsyn, B L, Savilov, A
Format: Article
Language:English
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Summary:The Fusion Free-Electron Maser (FFF) is the prototype of a high-power, tunable source of mm-wave radiation, for use on fusion plasma devices. In previous experiments a net output power of 730 kW at 206 GHz was generated in short pulses. The present experiment has been equipped with a system to recover the charge and energy of the spent electron beam. We present experimental results which show output of mm-wave radiation at constant power level during the full pulse length, as well as single-frequency operation; even though the cavity is highly overmoded; the latter is reached by effective suppression of spurious modes by the feedback system.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.89.214801