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A multi-megawatt Electron Cyclotron Resonance Heating (ECRH) system is in routine operation at the ASDEX Upgrade (AUG) tokamak. It applies four step-tunable gyrotrons at 105 and 140 GHz with 10 s pulse length and output powers close to 1 MW. An upgrade with four more gyrotrons is underway which will double the installed power. The first two-frequency gyrotron of the new series has recently been installed...
Recent few years a multi-frequency gyrotron for modernization of ASDEX Upgrade ECRH system is under development in GYCOM/IAP by contract with IPP. Following contract specifications the gyrotron must produce 10-s pulses with 1MW output power at 140GHz and over 800-kW power at 3 additional frequencies within 105-140GHz frequency range. The gyrotron output window is to be transparent for radiation in...
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