M. Sato

T. Idehara

National Institute for Fusion Science (NIFS-Repository)

§30. Quasi-Optical Gyrotron Testing Idehara, T. (Fukui University), Sato, M. A quasi-optical gyrotron has been rebuilt and tested under the cooperation with Fukui-University and NIFS. It was made as a R&D program of LHD ECRH system in 1990-1991 . The high voltage power supply in Fukui University was modified to operate the gyrotron in 1999. The gyrotron was ship and installed at Fukui-university in 2000 as shown in the Figure 1 . The magnet was excited to 0.5 T to adjust the magnetic axis to the tube axis. The transverse magnetic field component must be smaller than 0.1 % to the axial magnetic field. The magnet was excited to 4 T. The components, such as Quasi-optical resonator, collector and electron gun were installed in the cryo-housing after magnet testing. The vacuum reached to 2 x 1 o-7 torr. A new electron gun was made under the cooperation with NIFS, Fukui-U and Institute of Applied physics of Russia. Preliminary testing showed that it worked well to satisfy the design parameters at 1 ms pulse with 0.1 %duty. Microwave dummy load will be installed to examine the microwave power from the tube. • Figure I. Installation of the gyrotron at Fukui University. 243 

Quasi-Optical Gyrotron Testing

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