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A Ku-band coaxial relativistic transit-time oscillator with low guiding magnetic field

Published online by Cambridge University Press:  28 March 2014

Jun-Pu Ling ,
Jun-Tao He ,
Jian-De Zhang ,
Tao Jiang  and
Li-Li Song
Jun-Pu Ling
Affiliation:
College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha, Hunan, Peoples Republic of China
Jun-Tao He*
Affiliation:
College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha, Hunan, Peoples Republic of China
Jian-De Zhang
Affiliation:
College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha, Hunan, Peoples Republic of China
Tao Jiang
Affiliation:
College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha, Hunan, Peoples Republic of China
Li-Li Song
Affiliation:
College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha, Hunan, Peoples Republic of China
*
Address correspondence and reprint requests to: Jun-Tao He, College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha, Hunan, Peoples Republic of China410073. E-mail: [email protected]
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Abstract

A novel coaxial relativistic transit-time oscillator with low guiding magnetic field is proposed and investigated to generate high power microwave at Ku-band. With the coaxial structure and a quasi body wave adopted as the operating mode, the device has a larger space-charge limiting current, higher power handling capacity, and lower guiding magnetic field. Moreover, for further improving the output power, a coaxial TM02 mode resonant reflector is well designed. Main structure parameters of the device are optimized by particle in cell simulations. A typical simulation result is that, with a 358 keV, 7.25 kA beam guided by a magnetic field of about 0.7 T, an 810 MW microwave pulse at 14.25 GHz is generated, yielding a conversion efficiency of about 31%. The primary experiments are also carried out. At a low guiding magnetic field of 0.7 T, a microwave pulse with power of 400 MW, pulse duration of 30 ns, frequency of 14.3 GHz close to the simulation one, and efficiency of 15.4% is generated.

Keywords

Coaxial structureHigh power microwaveKu-bandLow guiding magnetic fieldTransit-time oscillator
Type
Research Article
Information
Laser and Particle Beams , Volume 32 , Issue 2 , June 2014 , pp. 295 - 303
Copyright
Copyright © Cambridge University Press 2014 

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