Technical developments at the KIT gyrotron test facility

Parasitic beam tunnel oscillations have been discovered on some of the series production gyrotrons for W7-X and also on the coaxial pre-prototype gyrotron for ITER. Solutions to remedy these problems have resulted in a modified beam tunnel design, technologically close to the existing beam tunnel. T...

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Bibliographic Details
Published in:Fusion engineering and design 2011-10, Vol.86 (6), p.518-521
Main Authors: Schmid, Martin, Erckmann, Volker, Gantenbein, Gerd, Illy, Stefan, Kern, Stefan, Liévin, Christophe, Samartsev, Andrey, Schlaich, Andreas, Rzesnicki, Thomáz, Thumm, Manfred
Format: Article
Language:English
Subjects:
Acceptance tests
Applied sciences
Atmospherics
Beam tunnel
Beams (radiation)
Controled nuclear fusion plants
Cylinders
ECRH
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Gyrotron
Gyrotrons
Installations for energy generation and conversion: thermal and electrical energy
Manufacturing engineering
Remedies
Superconducting magnet
Test load
Tunnels (transportation)
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Summary:Parasitic beam tunnel oscillations have been discovered on some of the series production gyrotrons for W7-X and also on the coaxial pre-prototype gyrotron for ITER. Solutions to remedy these problems have resulted in a modified beam tunnel design, technologically close to the existing beam tunnel. The new design has successfully been tested on both the coaxial and also the f-step-tunable gyrotrons and has subsequently been implemented on one of the W7-X series-production-tubes presently undergoing factory acceptance tests in Karlsruhe. The ECRH test loads at KIT are operated under normal atmospheric conditions. Several loads have eventually failed in 1 MW long pulse experiments and KIT has therefore started to design its own loads. The first KIT-load is based on a fixed conical mirror and an aluminum cylinder coated with a lossy material for increased absorption. The new load has so far successfully been used during the acceptance tests of two 1-MW CW gyrotrons. Nevertheless a new load based on pure (uncoated) stainless steel absorbers is being developed as a backup solution for the ongoing high priority gyrotron testing. A superconducting magnet capable of rapid field changes between 4.15 and 5.67 T for frequency step-tunable gyrotrons has been procured, has demonstrated a (static) field of 7.2 T and its capability of rapid field-changes.
ISSN:0920-3796
1873-7196
DOI:10.1016/j.fusengdes.2011.01.072