A 140 GHz Gyro-amplifier using a Dielectric-loaded, Sever-less Confocal Waveguide

被引：0

作者：

Soane, Alexander, V ^{[1
]}

Jawla, Sudheer ^{[1
]}

Shapiro, Michael A. ^{[1
]}

Temkin, Richard J. ^{[1
]}

机构：

[1] MIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA

来源：

2017 EIGHTEENTH INTERNATIONAL VACUUM ELECTRONICS CONFERENCE (IVEC) | 2017年

关键词：

Gyrotron; gyro-amplifier; confocal waveguide;

D O I：

暂无

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：

We report results of the high gain operation of a pulsed 140 GHz gyro-amplifier system under development at MIT for pulsed Dynamic Nuclear Polarization NMR (DNP-NMR). With a 46 kV, 3 A beam, the gyro-amplifier operated with 23 dB of device gain at 140 GHz, measured from the input port to the output port. With input / output coupling losses estimated at 12 dB, the gain of the confocal circuit itself is estimated to be 35 dB at 140 GHz. The gyro-amplifier uses a sever-less, confocal geometry to provide an overmoded interaction circuit with reduced mode competition. Higher gain has been achieved by including ceramic absorbers in order to attenuate unwanted oscillations due to spatial modes that are reflected from the outer vacuum tube wall.

引用

页数：2

共 4 条

[1] Demonstration of a 140-GHz 1-kW Confocal Gyro-Traveling-Wave Amplifier [J].

Joye, Colin D. ;

Shapiro, Michael A. ;

Sirigiri, Jagadishwar R. ;

Temkin, Richard J. .

IEEE TRANSACTIONS ON ELECTRON DEVICES, 2009, 56 (05) :818-827

[2] Amplification of Picosecond Pulses in a 140-GHz Gyrotron-Traveling Wave Tube [J].

Kim, H. J. ;

Nanni, E. A. ;

Shapiro, M. A. ;

Sirigiri, J. R. ;

Woskov, P. P. ;

Temkin, R. J. .

PHYSICAL REVIEW LETTERS, 2010, 105 (13)

[3]

Soane A. V., 2016, VAC EL C IEEE INT MO, P1

[4]

Soane AV, 2014, IEEE INT VAC ELECT C, P85, DOI 10.1109/IVEC.2014.6857502

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