Continuous-wave operation of a 460-GHz second harmonic gyrotron oscillator

被引：116
|
作者：
Hornstein, Melissa K.
Bajaj, Vikram S.
Griffin, Robert G.
Temkin, Richard J.
机构：
[1] MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA
[2] MIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA
[3] MIT, Dept Chem, Cambridge, MA 02139 USA
[4] MIT, Francis Bitter Natl Magnet Lab, Cambridge, MA 02139 USA
[5] MIT, Dept Phys, Cambridge, MA 02139 USA
来源：
IEEE TRANSACTIONS ON PLASMA SCIENCE | 2006年 / 34卷 / 03期
关键词：
continuous-wave (CW); dynamic nuclear polarization (DNP); gyrotron oscillator; harmonic; low voltage; nuclear magnetic resonance (NMR); submillimeter; terahertz;
D O I：
10.1109/TPS.2006.875769
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
We report the regulated continuous-wave (CW) operation of a second harmonic gyrotron oscillator at output power levels of over 8 W (12.4 kV and 135 mA beam voltage and current) in the TE0,6,1 mode near 460 GHz. The gyrotron also operates in the second harmonic TE2,6,1 mode at 456 GHz and in the TE2,3,1 fundamental mode at 233 GHz. CW operation was demonstrated for a one-hour period in the TE0,6,1 mode with better than 1% power stability, where the power was regulated using feedback control. Nonlinear simulations of the gyrotron operation agree with the experimentally measured output power and radio-frequency (RF) efficiency when cavity ohmic losses are included in the analysis. The output radiation pattern was measured using a pyroelectric camera and is highly Gaussian, with an ellipticity of 4%. The 460-GHz gyrotron will serve as a millimeter-wave source for sensitivity-enhanced nuclear magnetic resonance (dynamic nuclear polarization) experiments at a magnetic field of 16.4 T.
引用
收藏
页码：524 / 533
页数：10
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