A Novel Overmoded Slow-Wave High-Power Microwave (HPM) Generator

Zhang, Jun; Zhong, Huihuang; Luo, Lei

doi:10.1109/tps.2004.835970

Cited by 102 publications

(27 citation statements)

References 13 publications

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“…Same approach applies also to our system with a significant difference: in the case when the DBE condition is satisfied, all four degenerate EM modes rather than one interact synchronously with the induced charge wave. In similar manner, we distinguish our approach from overmoded SWS designs 34,35 thanks to the degeneracy condition.…”

Section: Ctl Model Of a Periodic Waveguide With A Dbe Interactingmentioning

confidence: 99%

Giant amplification in degenerate band edge slow-wave structures interacting with an electron beam

et al. 2016

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We propose a new amplification regime based on synchronous operation of four degenerate electromagnetic (EM) modes in a slow-wave structure and the electron beam, referred to as super synchronization. These four EM modes arise in a Fabry-Pérot cavity (FPC) when degenerate band edge (DBE) condition is satisfied. The modes interact constructively with the electron beam resulting in superior amplification. In particular, much larger gains are achieved for smaller beam currents compared to conventional structures based on synchronization with only a single EM mode. We demonstrate giant gain scaling with respect to the length of the slow-wave structure compared to conventional Pierce type single mode traveling wave tube amplifiers. We construct a coupled transmission line (CTL) model for a loaded waveguide slow-wave structure exhibiting a DBE, and investigate the phenomenon of giant gain via super synchronization using the Pierce model generalized to multimode interaction.

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Section: Ctl Model Of a Periodic Waveguide With A Dbe Interactingmentioning

confidence: 99%

Giant amplification in degenerate band edge slow-wave structures interacting with an electron beam

et al. 2016

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“…In this paper, we select the quasi body wave as the operation mode. Compared with the traditional device using the surface wave (Zhang et al, 2004) this proposed device has higher power capacity. Moreover, for enhancing the strength of the beam-wave interaction, the electron beam is usually located near the maximum of the electric field.…”

Section: Operation Mode Selectionmentioning

confidence: 98%

“…Furthermore, adopting the coaxial inner conductor inside the device could significantly reduce the space-charge effects. The deceases of both the current density and the space-charge effects are beneficial for lowering the guiding magnetic field (Zhang et al, 2004).…”

Section: Design Of the Low Guiding Magnetic Fieldmentioning

confidence: 99%

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

Ling

Zhang

et al. 2014

Laser Part. Beams

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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 TM 02 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.

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“…Among various kinds of HPM sources, the relativistic backward-wave oscillator (RBWO), which is considered as one of the most promising HPM generators, are of great interests for its potential application in high-energy physics, high power radar, and satellite communication due to its high efficiency and compact structures. [1][2][3][4][5] Ref. 6 shows that coaxial SWSs have an advantage over hollow SWSs in achieving high power capacity (which describes the maximum transmission power in the SWSs under the limitation of breakdown field strength) and mode control simultaneously, especially in high frequency band.…”

Section: Introductionmentioning

confidence: 99%

A 57GHz overmoded coaxial relativistic backward wave oscillator with high conversion efficiency and pure TM01 mode output

2017

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A 57GHz overmoded relativistic backward wave oscillator (RBWO) operating on the quasi-TEM mode with pure TM01 mode output is presented in this paper, by using outer trapezoidal slow wave structure (SWS) with large distance between inner and outer conductors. The large overmoded ratio can be obtained in coaxial devices to improve power handling capacity, while the large distance between inner and outer conductors can guarantee the electron beam transmit effectively. The 8π/9 mode of quasi-TEM synchronously interacts with the electron beam, while the TM01 mode diffracted by the quasi-TEM mode outputs. The existence of TM01 6π/9 mode in SWS can extract energy from the quasi-TEM mode (which has a high value of Qe) thus increasing the power handling capacity. Particle-in-cell simulation shows that generation with high power 560 MW and efficiency 43.5% is obtained under the diode voltage 520 kV and current 2.47 kA. And the microwave has the pure frequency spectrum of 56.8 GHz radiates in the pure TM01 mode (about 98%).

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A Novel Overmoded Slow-Wave High-Power Microwave (HPM) Generator

Cited by 102 publications

References 13 publications

Giant amplification in degenerate band edge slow-wave structures interacting with an electron beam

Giant amplification in degenerate band edge slow-wave structures interacting with an electron beam

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

A 57GHz overmoded coaxial relativistic backward wave oscillator with high conversion efficiency and pure TM01 mode output

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