Long-pulse operation at constant output power and single-frequency mode of a high-power electrostatic free-electron maser with depressed collector |
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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 |
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Institution: | FOM Institute for Plasma Physics "Rijnhuizen," Association EURATOM-FOM, Trilateral Euregio Cluster, P.O. Box 1207, 3430 BE Nieuwegein, The Netherlands. |
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Abstract: | 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. |
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