Development of 394.6 GHz CW gyrotron (Gyrotron FUCWII) for DNP/proton-NMR at 600 MHz

被引：73
|
作者：
Idehara, T. [1 ]
Ogawa, I. [1 ]
Agusu, La [1 ]
Kanemaki, T. [1 ]
Mitsudo, S. [1 ]
Saito, T. [1 ]
Fujiwara, T. [1 ]
Takahashi, H. [1 ]
机构：
[1] Univ Fukui Bunkyo, Res Ctr Dev Far Infrared Reg, Fukui 9108507, Japan
来源：
INTERNATIONAL JOURNAL OF INFRARED AND MILLIMETER WAVES | 2007年 / 28卷 / 06期
基金：
日本科学技术振兴机构;
关键词：
gyrotron; THz; DNP; NMR; CW operation; second harmonic;
D O I：
10.1007/s10762-007-9224-x
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
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.
引用
收藏
页码：433 / 442
页数：10
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