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Sub-THz gyrotrons with the functions of frequency control are useful for application to high power sub-THz spectroscopy including a DNP enhanced high-sensitive NMR spectroscopy. Continuous frequency tunability, frequency modulation and frequency step-changing will be achieved for our Gyrotron FU CW Series and such special functions of frequency control are applied for additional enhancement of NMR...
Development of two 460 GHz second harmonic gyrotrons for 700 MHz DNP-NMR spectroscopy is presented. One gyrotron is frequency-fixed and the other is frequency tunable in the bandwidth of 1.5 GHz. In addition, the former has a function of frequency modulation.
We used the world first hard x-ray FEL to investigate the response of molecular systems to the ultraintense, femtosecond x-ray radiation. We report sequential multiphoton ionization, frustrated absorption and double core hole production mechanisms.
A high power THz radiation source is needed to analyze the structures of complex proteins by DNP-NMR spectroscopy. For this objective, we have been developing gyrotrons having boardband frequency tunability using a long cavity. Prototype gyrotron was achieved with a tuning range of 1.6 GHz and exceeded output power of 10 W.
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