Relativistic backward-wave oscillators operating near cyclotron resonance

Vlasov, Alexander N.; Nusinovich, G. S.; Levush, B.; Bromborsky, A.; Lou, W. R.; Carmel, Y.

doi:10.1063/1.860902

Cited by 34 publications

(19 citation statements)

References 15 publications

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“…Additionally, the measured resonant magnetic fields of this article may differ from those of previous works ͑see Refs. 1,4,9,12,14, and 20͒ because the experiment design parameters of this article are different. Similarly, one can obtain the other theoretically predicted value of the resonant magnetic field using the design parameters of our experiment; therefore, B 2 res is about 12.0 kG.…”

Section: Discussionmentioning

confidence: 98%

“…Many authors [1][2][3][4][5][6][7][8][9][10][11][12] have focused their attention on this device for more efficient operation at high-power levels, and important results have been obtained both experimentally and theoretically. In order to further enhance the output power of microwave and the conversion efficiency of electron beam to microwave radiation, some scientists [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] have introduced background plasmas into the BWOs, and both theoretical and experimental results have demonstrated that the background plasmas improve the beam-waveguide interaction dramatically.…”

Section: Introductionmentioning

confidence: 96%

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Experiment on the plasma-loaded backward-wave oscillator using a gas-loaded foil-less diode

Qian

Liu

et al. 2000

Journal of Applied Physics

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High-power microwave radiation of 9.5–13.4 GHz was generated in a plasma-loaded backward-wave oscillator employing a relativistic electron beam of 400–500 keV and 1–3 kA. This experiment was to re-examine and confirm the previous works that had been done in other various institutions. The relativistic electron beam, which was produced from a helium gas-loaded foil-less diode, was injected into the helium gas-loaded rippled-wall waveguide of the backward-wave oscillator, generating a plasma in the waveguide and then the high-power microwave radiation. A sharp increase in the output microwave power has been observed in a narrow range of the helium gas pressure, and two dips in the microwave emission have also been found in a certain range of the axial magnetic field. Additionally, at certain values of the helium gas pressure and guide magnetic field, the total microwave emission of the plasma-loaded backward-wave oscillator was found to be seven times as large as that of the vacuum case. The highest interaction efficiency was estimated to be about 29% for the present experiment.

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Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 96%

Experiment on the plasma-loaded backward-wave oscillator using a gas-loaded foil-less diode

Qian

Liu

et al. 2000

Journal of Applied Physics

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“…[53], the cyclotron dip calculated numerically and measured experimentally is shown. References [53] and [54] considered the cyclotron resonance with the zeroeth spatial harmonic of the backward wave. As was"mentioned in the beginning of this subsection, the cyclotron resonance with the zeroeth harmonic of the forward wave is also possible, as shown in Fig.…”

Section: Cyclotron Resonance Effectsmentioning

confidence: 99%

“…14, taken from Ref. [53], the cyclotron dip calculated numerically and measured experimentally is shown. References [53] and [54] considered the cyclotron resonance with the zeroeth spatial harmonic of the backward wave.…”

Section: Cyclotron Resonance Effectsmentioning

confidence: 99%

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Research on Compact, High-Energy, Microwave Sources (MURI '94)

Granatstein¹

2000

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Relativistic Surface Wave Oscillator in Y-Band with Large Oversized Structures Modulated by Dual Reflectors

Wang

2020

Sci Rep

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To increase the generation efficiency of the terahertz wave in the Y band, the idea of dual-reflector is introduced in the relativistic surface wave oscillator (SWo) with large oversized structures. the dual-reflector and the slow-wave structure (SWS) construct a resonator where the field strength of tM 01 mode inside is intensively enhanced and then the efficiency is increased. The pre-modulation on electron beam caused by the reflector is also helpful in improving the output power. Meanwhile, the reflector can reduce the loss of negatively going electrons. Through the particle-in-cell (PIC) simulations, the optimized structure is tested to be stable and little power is transmitting back to the diode area. The output power reaches 138 MW in the perfectly electrical conductivity condition and the frequency is 337.7 GHz with a pure spectrum. The device's efficiency is increased from 10.7% to 16.2%, compared with the device without any reflectors. The performance of device with lossy material is also focused on. In the situation of copper device, the output power is about 41 MW under the same input conditions and the corresponding efficiency is about 4.8%. In recent years, the terahertz wave has shown great potential in the applications of remote high-resolution imaging, remote detection of radioactive material, deep space research and communications, plasma diagnostic in nuclear fusion, materials research, biomedical diagnostics, high data rate communications, basic biological spectroscopy, chemical spectroscopy, and so on 1-8. The prospect of terahertz technology has attracted many researchers to devote to developing the high power terahertz generators, especially the vacuum electronic devices (VEDs) 9-13. And the slow wave devices are an important class of the VEDs. Based on the interaction between the intense electron beam and the slow-wave structure (SWS), the backward wave oscillator (BWO) becomes a remarkable kind of slow wave device with good performance in high output power and compact structure 14,15. In a BWO, the electrons are in synchronism with −1 st spatial harmonic wave. When a slow wave device operates near the upper edge of the transmission band, it becomes a surface wave oscillator (SWO) whose operation point is close to π point. In an SWO, the fundamental wave slows down to the electron velocity 16. The Q-factor in the SWO is relatively large due to the large reflection and small group velocity, and then the start current is usually lowered in this case 17,18. What's more, the large coupling impedance in the SWO is significant in obtaining high interaction efficiency. Besides, use of the surface wave is valid in achieving mode selection in the overmoded structure as well. Thus, the SWO attracts more and more attention in generating millimeter and terahertz waves. However, their structural dimensions decrease rapidly as the working frequency goes up, causing many crucial problems that must be solved, such as the internal breakdown, limitation of the power capacity, and difficulties in manufacturi...

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Relativistic backward-wave oscillators operating near cyclotron resonance

Cited by 34 publications

References 15 publications

Experiment on the plasma-loaded backward-wave oscillator using a gas-loaded foil-less diode

Experiment on the plasma-loaded backward-wave oscillator using a gas-loaded foil-less diode

Research on Compact, High-Energy, Microwave Sources (MURI '94)

Relativistic Surface Wave Oscillator in Y-Band with Large Oversized Structures Modulated by Dual Reflectors

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