The theoretical study of a step-tunable gyrotron controlled by successive excitation of multi-harmonic modes is presented in this paper. An axis-encircling electron beam is employed to eliminate the harmonic mode competition. Physics images are depicted to elaborate the multi-harmonic interaction mechanism in determining the operating parameters at which arbitrary harmonic tuning can be realized by magnetic field sweeping to achieve controlled multiband frequencies' radiation. An important principle is revealed that a weak coupling coefficient under a high-harmonic interaction can be compensated by a high Q-factor. To some extent, the complementation between the high Q-factor and weak coupling coefficient makes the high-harmonic mode potential to achieve high efficiency. Based on a previous optimized magnetic cusp gun, the multi-harmonic step-tunable gyrotron is feasible by using harmonic tuning of first-to-fourth harmonic modes. Multimode simulation shows that the multi-harmonic gyrotron can operate on the 34 GHz first-harmonic TE11 mode, 54 GHz second-harmonic TE21 mode, 74 GHz third-harmonic TE31 mode, and 94 GHz fourth-harmonic TE41 mode, corresponding to peak efficiencies of 28.6%, 35.7%, 17.1%, and 11.4%, respectively. The multi-harmonic step-tunable gyrotron provides new possibilities in millimeter–terahertz source development especially for advanced terahertz applications.
Skip Nav Destination
Article navigation
March 2017
Research Article|
March 01 2017
The design of a multi-harmonic step-tunable gyrotron
Xiang-Bo Qi
;
Xiang-Bo Qi
School of Electronics Engineering and Computer Science,
Peking University
, Beijing 100871, People's Republic of China
Search for other works by this author on:
Chao-Hai Du
;
Chao-Hai Du
a)
School of Electronics Engineering and Computer Science,
Peking University
, Beijing 100871, People's Republic of China
Search for other works by this author on:
Juan-Feng Zhu;
Juan-Feng Zhu
School of Electronics Engineering and Computer Science,
Peking University
, Beijing 100871, People's Republic of China
Search for other works by this author on:
Shi Pan;
Shi Pan
School of Electronics Engineering and Computer Science,
Peking University
, Beijing 100871, People's Republic of China
Search for other works by this author on:
Pu-Kun Liu
Pu-Kun Liu
a)
School of Electronics Engineering and Computer Science,
Peking University
, Beijing 100871, People's Republic of China
Search for other works by this author on:
a)
Authors to whom correspondence should be addressed. Electronic addresses: [email protected] and [email protected].
Phys. Plasmas 24, 033101 (2017)
Article history
Received:
January 06 2017
Accepted:
February 13 2017
Citation
Xiang-Bo Qi, Chao-Hai Du, Juan-Feng Zhu, Shi Pan, Pu-Kun Liu; The design of a multi-harmonic step-tunable gyrotron. Phys. Plasmas 1 March 2017; 24 (3): 033101. https://doi.org/10.1063/1.4977452
Download citation file:
Pay-Per-View Access
$40.00
Sign In
You could not be signed in. Please check your credentials and make sure you have an active account and try again.
Citing articles via
Progress toward fusion energy breakeven and gain as measured against the Lawson criterion
Samuel E. Wurzel, Scott C. Hsu
Weakly nonlinear incompressible Rayleigh–Taylor–Kelvin–Helmholtz instability in plane geometry
Zhen-Qi Zou, Jun-Feng Wu, et al.
FreeGSNKE: A Python-based dynamic free-boundary toroidal plasma equilibrium solver
N. C. Amorisco, A. Agnello, et al.
Related Content
Mode control by rearrangement of the slow wave structure in a 12-cavity relativistic magnetron with diffraction output using single-stepped cavities driven by a transparent cathode
AIP Advances (March 2021)
PIC simulations of a frequency agile multicavity relativistic magnetron using irregular ring metamaterials driven by a transparent cathode
Phys. Plasmas (July 2022)
Investigation of the operating characteristics of a 12 stepped-cavity relativistic magnetron with axial extraction driven by an “F” transparent cathode using particle-in-cell simulations
Phys. Plasmas (November 2016)
A “crab-like” 12-cavity relativistic magnetron with diffraction output driven by a transparent cathode
Phys. Plasmas (October 2019)