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 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.
Urbanus
W H
WH
FOM Institute for Plasma Physics "Rijnhuizen," Association EURATOM-FOM, Trilateral Euregio Cluster, P.O. Box 1207, 3430 BE Nieuwegein, The Netherlands.
Bongers
W A
WA
Bratman
V
V
Van Der Geer
C A J
CA
Graswinckel
M F
MF
Manintveld
P
P
Militsyn
B L
BL
Savilov
A
A