Characterization of High Power Microwave Radiation by an Axially Extracted Vircator

Verma, Rishi; Shukla, Rohit; Sharma, Srishti; Banerjee, Partha P.; Das, Rakesh; Deb, P.; Prabaharan, T.; Das, Basanta Kumar; Mishra, Ekansh; Adhikary, Biswajit; Sagar, K.; Meena, Manraj; Shyam, A.

doi:10.1109/ted.2013.2288310

Cited by 16 publications

(7 citation statements)

References 24 publications

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“…Here, P t is the power at the transmitting antenna, P r is the power at the receiving antenna, G t is the transmitting antenna gain, G r is the receiving antenna gain, D is the distance between the transmitting antenna and the receiving antenna, and λ is the wavelength of the microwave signal [24]. In the RF measuring system, the gain of the transmitting antenna G t and the gain of the double-ridged horn antenna G r are 18.5 dBi and 12.82 dBi, respectively.…”

Section: Measurement Equipmentmentioning

confidence: 99%

“…According to the simulations, the ring reflector seems to attract the virtual cathode and lengthen the reciprocating distance when the anode to ring reflector distance is between 6 mm and 15 mm. Because the reciprocating frequency is inversely proportional to the reciprocating distance, the frequency shift is caused due to the lengthened reciprocating distance [24]. 10, x FOR PEER REVIEW 6 of 11 mm.…”

Section: Pic Simulationmentioning

confidence: 99%

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Experimental Investigation into the Optimum Position of a Ring Reflector for an Axial Virtual Cathode Oscillator

et al. 2021

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A ring reflector was experimentally investigated using an axial virtual cathode oscillator (vircator). The ring reflector was installed behind the mesh anode of the axial vircator to enhance the microwave power output by forming a resonant cavity and increasing the electron beam to microwave energy conversion efficiency. The optimum position of the ring reflector is analyzed through simulations and experiments by varying the anode to reflector distance from 6 mm to 24 mm in 3 mm steps. PIC simulations show that the ring reflector enhances the microwave power of the axial vircator up to 220%. Experiments show that the microwave power from the axial vircator without the ring reflector is 11.22 MW. The maximum average peak microwave power of the axial vircator with the ring reflector is 25.82 MW when the anode to ring reflector distance is 18 mm. From the simulations and experiments, it can be seen that the ring reflector yields decaying enhancement that is inversely proportional to the anode to ring reflector distance and there is no noticeable microwave enhancement after 24 mm. The frequency range attained from the simulations and experiments is 5.8 to 6.7 GHz and 5.16 to 5.8 GHz, respectively. The difference between the simulation and experimental results is due to the error in the anode to cathode gap distance. Although the frequency is slightly changed, the ring reflector seems to have no influence on the frequency of the generated microwave.

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Section: Measurement Equipmentmentioning

confidence: 99%

Section: Pic Simulationmentioning

confidence: 99%

Experimental Investigation into the Optimum Position of a Ring Reflector for an Axial Virtual Cathode Oscillator

et al. 2021

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“…Here, f vc is the frequency of the virtual cathode, f r is the frequency of the reciprocating motion, e is the electron charge, m is the electron mass, d is the anode to cathode distance in centimeters, and V is the diode voltage [7]. Unlike most microwave devices, the vircator can be driven without external magnetic field generating devices.…”

Section: Introductionmentioning

confidence: 99%

Operation Features of a Coaxial Virtual Cathode Oscillator Emitting Electrons in the Outer Radial Direction

et al. 2021

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The operation features of the coaxial virtual cathode oscillator emitting electrons in the outer radial direction were investigated through simulations and experiments. A coaxial vircator was compared with an axial vircator when the anode to cathode distance of both vircators was 6 mm. The proposed coaxial vircator was operated when the anode to cathode distance was 5 mm, 6 mm, and 7 mm. The peak power and frequency of the microwave generated from the proposed coaxial vircator when the anode to cathode distance was 6 mm were 20.18 MW and 6.17 GHz, respectively. The simulations and experiments show that the proposed coaxial vircator generates 80% more microwave power than the axial vircator with the same anode to cathode distance. According to the simulations and experiments, the proposed coaxial vircator tends to generate a higher power average when the anode to cathode distance was larger than 5 mm. The frequency of the proposed coaxial vircator when the anode to cathode distance was 5 mm and 7 mm was approximately 8 GHz and 5 GHz, respectively. The geometric factor of the proposed coaxial vircator was considered to be the reason for the greater microwave power generation than the axial vircator. The frequency of the proposed coaxial vircator decreases inversely proportional with the anode to cathode distance as observed in the axial and basic coaxial vircators.

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“…The operation of VCOs (vircators, virtodes, reflex triodes, etc. ) is based on the formation of the VC in the electron beam with overcritical current (Mahaffey et al 1977;Sullivan et al 1987;Kostov et al 1993Kostov et al , 1999Benford et al 2007;Hramov et al 2010;Verma et al 2014). At the present time the increase of the efficiency, the power and the generation frequency (the advancement to the sub-THz range) of a vircator and the development of the methods for the control of its generation characteristics are the actual problems of a modern plasma physics and high-power microwave electronics.…”

Section: Introductionmentioning

confidence: 99%

Effect of the electron beam modulation on the sub-THz generation in the vircator with the field-emission cathode

2015

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In this paper, we focus on the numerical investigation of the vircator with a controlling emission from a field-emission cathode. The external harmonic signal is added to the accelerating electric field in the beam formation region and effects on the beam emission process leading to the electron emission modulation. As a consequence, the beam is injected into the drift chamber of the vircator being density-modulated. The strong influence of the modulation parameters (modulation depth and frequency) on the characteristics of virtual cathode oscillations has been discovered. We have shown that the tuning of the modulation frequency to the harmonics of the basic frequency of virtual cathode oscillations leads to the considerable power increase of its higher harmonics in the output spectrum.

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Characterization of High Power Microwave Radiation by an Axially Extracted Vircator

Cited by 16 publications

References 24 publications

Experimental Investigation into the Optimum Position of a Ring Reflector for an Axial Virtual Cathode Oscillator

Experimental Investigation into the Optimum Position of a Ring Reflector for an Axial Virtual Cathode Oscillator

Operation Features of a Coaxial Virtual Cathode Oscillator Emitting Electrons in the Outer Radial Direction

Effect of the electron beam modulation on the sub-THz generation in the vircator with the field-emission cathode

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