Abstract
The European Gyrotron Consortium (EGYC) is responsible for developing one set of 170 GHz mm-wave sources, in support of Europe’s contribution to ITER. The original plan of targeting a 2 MW coaxial gyrotron is currently under discussion, in view of essential delays and damages. This paper reports on the latest results and plans with regard to the two 2 MW gyrotron prototypes, the industrial prototype at CRPP’s CW test stand and a modular pre-prototype at KIT. The industrial prototype was delivered to CRPP end of September 2011 and reached an output power of 2 MW at an efficiency of 45 % and with good RF beam pattern, in only four days of short pulse RF test. These results validated all design changes made in reaction to the results of the experiments in 2008. On the fifth experimental day, an internal absorber broke, terminating any further experiment with this tube. In parallel, design and experimental activities at KIT went on, in particular featuring reduced stray radiation down to 4% of the RF power. Next years’ plans for the 2 MW modular pre-prototype foresee a stepwise increase of pulse length.
Highlights
The ITER fusion facility which is currently under construction in a world-wide collaboration will be equipped with a powerful electron cyclotron resonance heating (ECRH) system, among others
This paper reports on the latest results and plans with regard to the two 2 MW gyrotron prototypes, the industrial prototype at CRPP’s CW test stand and a modular pre-prototype at KIT
Europe will provide for this purpose gyrotrons for a total of 8 MW generated power, which are under development through the European Gyrotron Consortium (EGYC), with Thales Electron Devices (TED), Velizy, France as industrial partner [1]
Summary
The ITER fusion facility which is currently under construction in a world-wide collaboration will be equipped with a powerful electron cyclotron resonance heating (ECRH) system, among others. This refurbished prototype was delivered to CRPP with major delays due to manufacturing problems in September 2011. It was shortly tested with good success, but the experiments were terminated by an internal RF absorber, which broke and flooded the tube with water, rendering the tube unusable. In view of this accident and the delays, and in view of the large experience in Europe with series production of conventional MW-class gyrotrons, a fallback to a conventional 1 MW 170 GHz gyrotron is currently under consideration. The paper reports on the latest results with the two 2 MW coaxial gyrotrons, the refurbished prototype at CRPP and the short pulse pre-prototype at KIT (see Figure 1), as well as on the planning for further steps
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