Abstract
The new gyrotron series at the Research Center for Development of Far Infrared Region, University of Fukui (FU), the so-called FU CW (continuous-wave) gyrotron series, is being developed for the application to high-power terahertz technologies. The second gyrotron of the series, FU CW II gyrotron with an 8 T liquid He-free superconducting magnet, has been constructed and the operation test was successfully carried out. It will be used for enhancing the sensitivity of 600 MHz proton nuclear magnetic resonance by the use of dynamic nuclear polarization (DNP). The designed operation mode of the gyrotron is TE2,6 at the second harmonic. The corresponding designed frequency is 394.6 GHz. The real operation frequency is 394.3 GHz at the TE0,6 mode, because of the fabrication error of the cavity diameter. The operation is in complete CW at an output power of around 30 W or higher at the TE0,6 cavity mode. There are many other operation modes at the fundamental and the second harmonics. Typical output power of the fundamental and the second harmonics is higher than 100 and 20 W, respectively. The third gyrotron, FU CW III gyrotron with a 20 T superconducting magnet, has already been constructed and the operation test has been almost completed. The highest frequency is around 980 GHz at the second harmonic operation. This gyrotron demonstrates the possibility of an application to higher-frequency DNP of up to 1 GHz.
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