Development of 394.6 GHz CW Gyrotron (Gyrotron FU CW II) for DNP/Proton-NMR at 600 MHz

Gyrotron FU CW II with an 8 T liquid He free superconducting magnet, the second gyrotron of the THz Gyrotron FU CW Series, has been constructed and the operation test was successfully carried out. It will be used for enhancing the sensitivity of 600 MHz proton-NMR by use of Dynamic Nuclear Polarizat...

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Bibliographic Details
Published in:International journal of infrared and millimeter waves 2007-06, Vol.28 (6), p.433-442
Main Authors: Idehara, T., Ogawa, I., Agusu, La, Kanemaki, T., Mitsudo, S., Saito, T., Fujiwara, T., Takahashi, H.
Format: Article
Language:English
Subjects:
Cyclotron resonance devices
Diameters
Magnetism
NMR
Nuclear magnetic resonance
Protons
Sensitivity enhancement
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Summary:Gyrotron FU CW II with an 8 T liquid He free superconducting magnet, the second gyrotron of the THz Gyrotron FU CW Series, has been constructed and the operation test was successfully carried out. It will be used for enhancing the sensitivity of 600 MHz proton-NMR by use of Dynamic Nuclear Polarization (DNP). The designed operation mode of the gyrotron is TE2,6 at the second harmonic. The corresponding frequency is 394.6 GHz. The real operation frequency is 394.3 GHz at TE06 mode, because of fabrication error of the diameter of the cavity. The operation is in complete CW at the output power of around 30 W or higher at the TE06 cavity mode. There are many other operation modes at the fundamental and the second harmonic. Typical output power of the fundamental and the second harmonic are higher than 100 W and 20 W, respectively. The highest frequency observed up to the present is 443.5 GHz at the second harmonic operation of TE6,5 mode. The measured results are compared with the theoretical consideration.
ISSN:0195-9271
1866-6892
1572-9559
1866-6906
DOI:10.1007/s10762-007-9224-x