Report of recent experiments with the European 1 MW, 170 GHz CW and SP prototype gyrotrons for ITER
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The quality factor and oscillating mode of a gyrotron cavity are essential parameters to consider when trying to obtain a high power (>500 kW), high efficiency (∼50%) microwave source, which oscillates in a stable manner in the principal mode of the cavity ...
The parasitic oscillation of the TE21-degrees gyrotron backward wave (gyro BW) mode is observed in a low-Q, 8 GHz TE011-degrees gyrotron. Although at low power (P(BW) < 5 kW), the oscillation of the gyro BW mode, simultaneously with the gyrotron mode, resu ...
In current tokamaks and, in particular, in future larger devices such as ITER, the control of neo-classical tearing modes (NTM) is essential for achieving high performance in terms of the beta limit. A commonly used scheme for NTM stabilization consists in ...
For the development of a 1 MW, 140 GHz gyrotron for CW operation which will be installed at the stellarator facility Wendelstein 7-X at IPP Greifswald, a collaboration between different European research institutes and an industrial company has been establ ...
The development of high power gyrotrons in continuous wave (CW) operation for heating of plasmas used in nuclear fusion research has been in progress for several years in a joint collaboration between different European research institutes and industrial p ...
Experimental start-up results of a 118 GHz TE(22,6) gyrotron are presented and compared with theory. The theoretical excitation regimes of competing modes are computed in the energy-velocity-pitch-angle plane. The start-up paths through the plane are deter ...
This thesis aims at developing wireless systems with a strong emphasis on low-power consumption and low-voltage operation. The main technical objective is the development of a single cells battery operated fully integrated CMOS RF transceiver that fulfills ...
