NDLI: Experimental investigations on the pre-prototype of the 170 GHz, 2 MW coaxial cavity gyrotron for ITER

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Experimental investigations on the pre-prototype of the 170 GHz, 2 MW coaxial cavity gyrotron for ITER

Content Provider	Semantic Scholar
Author	Rzesnicki, Tomasz Piosczyk, Bernhard Flamm, Jens Jin, Jianbo Kern, Stefan Prinz, O. Thumm, Manfred
Copyright Year	2008
Abstract	The first industrial prototype of a 2 MW, CW, 170 GHz coaxial cavity gyrotron, which is under development for use in ITER, has been tested recently at CRPP Lausanne. As part of this European development of the 2 MW, 170 GHz coaxial cavity gyrotron, investigations have been performed on a short pulse coaxial tube (preprototype) at the Forschungszentrum Karlsruhe (FZK). The pre-prototype tube utilizes the same TE34,19 mode and the same cavity with up-taper, launcher and mirrors and a very similar electron as used in the industrial prototype. Thus the obtained results and observed problems are considered to be relevant for the prototype. Within this investigations parasitic low frequency (LF) oscillations have been studied and the intensity has been significantly reduced by performing some geometrical modifications. Recently in operation at higher voltages near the nominal parameters, parasitic high frequency oscillation around 160 GHz appears simultaneously with the desired gyrotron working mode. There are indications, that the high frequency parasites are excited in the beam tunnel. Investigations to suppress the oscillations are going on. The improvement of the performance of the q.o. RF-output system is a very important task. Extensive simulations and measurements have been done in order to enhance the performance of the RF beam. With a newly developed code a launcher has been designed which delivers a microwave beam with a Gaussian content around 95%.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www-pub.iaea.org/MTCD/Meetings/FEC2008/ft_3-1rc.pdf
Alternate Webpage(s)	https://www-pub.iaea.org/MTCD/Meetings/FEC2008/ft_3-1rc.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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