Abstract
The European 1 MW, 170 GHz CW industrial prototype gyrotron for ECRH&CD on ITER was under test at the KIT test facility during 2016. In order to optimize the gyrotron operation, the tube was thoroughly tested in the short-pulse regime, with pulse lengths below 10 ms, for a wide range of operational parameters. The operation was extended to longer pulses with a duration of up to 180 s. In this work we present in detail the achievements and the challenges that were faced during the long-pulse experimental campaign.
Highlights
The European 1 MW, 170 GHz industrial prototype CW gyrotron for ECRH&CD on ITER is a conventional gyrotron, which has been developed by the European GYrotron Consortium (EGYC) in cooperation with the industrial partner Thales Electron Devices (TED), under the coordination of the European Joint Undertaking for ITER and the Development of Fusion Energy (F4E)
The nominal one is the High Voltage Operating Point (HVOP), which corresponds to an accelerating voltage of 79.5 kV and a beam current of 40 A, the alternative one is the Low Voltage Operating Point (LVOP), which corresponds to an accelerating voltage of 71 kV and a beam current of 45 A
The first phase of the experiments with the 1 MW, 170 GHz CW prototype EU gyrotron for the ITER ECRH&CD system have been successfully completed at KIT
Summary
The European 1 MW, 170 GHz industrial prototype CW gyrotron for ECRH&CD on ITER is a conventional (hollow-cavity) gyrotron, which has been developed by the European GYrotron Consortium (EGYC) in cooperation with the industrial partner Thales Electron Devices (TED), under the coordination of the European Joint Undertaking for ITER and the Development of Fusion Energy (F4E). The SP prototype was developed in order to validate the scientific design in terms of RF output power, total efficiency and quality of RF output beam. The SP prototype was extensively tested at the KIT test facility in 2015 and the scientific design of the individual tube components has been verified, with the gyrotron delivering an output power of higher than 1.2 MW with 40 % total efficiency (in single-stage depressed collector operation) and with a RF output beam Gaussian mode content of about ~98 % [2]. The CW industrial prototype was delivered to the KIT test facility in early 2016 and the experiments started immediately in the short-pulse regime (with pulse length below 10 ms). In this work we focus on the performance of the tube during the second validation phase, i.e. long-pulse operation at the KIT test facility, details regarding the operating points are presented, the performance of the tube during the short-pulse phase of the experiments is summarized and the long-pulse phase of the experiments with pulses up to 180 s is analyzed
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