Effect of longitudinal magnetic field on microwave efficiency of virtual cathode oscillator

Jiang, Weihua; Kitano, H.; Huang, Linhua; Masugata, Katsumi; Yatsui, Kiyoshi

doi:10.1109/27.491758

Cited by 39 publications

(13 citation statements)

References 12 publications

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“…We can see that the distance between the meshed anode and the virtual cathode is almost the same distance as the A-K gap 5 mm. It is noted that the electron behavior in the diode region takes similar characteristics to the previous results (13) between the real cathode and the anode in the 3-dimentioal particle-in-cell (PIC) simulation code called "MAGIC". Figure 2 shows the spectrum distribution of the radial electric field obtained from the virtual cathode oscillation and the reflected electrons due to the virtual cathode.…”

Section: Dynamics Of Virtual Cathode Formationsupporting

confidence: 76%

Axially Extracted Virtual Cathode Oscillator with Annular Cathode

et al. 2004

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A numerical simulation study of a virtual cathode oscillator with annular cathode has been performed by a 3 dimensional particle-in-cell (PIC) code called MAGIC. Also the experimental studies are performed for comparison of numerical results. The annular diode consists of circular anode mesh and annular type cathode. The object for this investigation is to find the optimized width and radius of the annular cathode in our high power microwave pulser, "Chundoong". Both of simulation and experimental results show that the output microwave power and frequency depend on emission width and radius of annular cathode, and the dominant mode of output microwave is T M 01 under the optimized width 4 mm and radius of 20 mm.

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Section: Dynamics Of Virtual Cathode Formationsupporting

confidence: 76%

Axially Extracted Virtual Cathode Oscillator with Annular Cathode

et al. 2004

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“…The vircator is a microwave generator whose operation is based on oscillations of the virtual cathode (VC) in the electron beam with the overcritical current [1][2][3]. In recent years vircators have bean widely studied experimentally [3][4][5][6][7][8][9][10], by computer simulation [3,[11][12][13][14][15][16][17] and analytical analysis [18][19][20][21]. Microwave radiation in vircators is generated when the current of a charged particle beam exceeds the critical (so-called space charge limiting) current I SCL [1,2].…”

Section: Introductionmentioning

confidence: 99%

Effect of external magnetic field on critical current for the onset of virtual cathode oscillations in relativistic electron beams

et al. 2008

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In this Letter we research the space charge limiting current value at which the oscillating virtual cathode is formed in the relativistic electron beam as a function of the external magnetic field guiding the beam electrons. It is shown that the space charge limiting (critical) current decreases with growth of the external magnetic field, and that there is an optimal induction value of the magnetic field at which the critical current for the onset of virtual cathode oscillations in the electron beam is minimum. For the strong external magnetic field the space charge limiting current corresponds to the analytical relation derived under the assumption that the motion of the electron beam is one-dimensional [High Power Microwave Sources. Artech Microwave Library, 1987. Chapter 13]. Such behavior is explained by the characteristic features of the dynamics of electron space charge in the longitudinal and radial directions in the drift space at the different external magnetic fields. House

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“…It is known that the emission frequency from a vircator is determined by both the reflected electron beam and virtual cathode oscillations due to virtual cathode formation [3], [14], [15]. In this simulation results we observed that it makes no difference except for a small shift of frequency.…”

Section: Simulation Resultsmentioning

confidence: 48%

A diode design study of the virtual cathode oscillator with a ring-type reflector

Jeon

Sung

Lim

et al. 2005

IEEE Trans. Plasma Sci.

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A numerical simulation study of the high-power microwave generation from the vircator (virtual cathode oscillator) is carried out for coaxial diode structure by using a three-dimensional particle-in-cell (PIC) code called MAGIC. The coaxial vircator has a centered annular cathode body, cathode ring and cylindrical meshed-anode in order to enlarge the active interaction region in the virtual cathode space. In order to enhance a conversion efficiency of the output microwave power, ring-type reflector was installed to coaxial-type diode structure. The simulation results show that the output microwave frequency has a narrow bandwidth and its output microwave power sensitively depends upon the position and width of ring-type reflector. The maximum output microwave power is obtained by adopting a ring-type reflector 10 mm in width and 40 mm in the distance from the intense relativistic electron beam to the ring-type reflector. The output microwave mode without a ring-type reflector is a mixture of TM and TE mode. However, the TM 01 mode with its resonance frequency of 2.2 GHz is dominant for the ring-type reflector.Index Terms-Coaxial, cylindrical virtual cathode oscillator, high-power microwave (HPM), ring-type reflector, vircator.

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Effect of longitudinal magnetic field on microwave efficiency of virtual cathode oscillator

Cited by 39 publications

References 12 publications

Axially Extracted Virtual Cathode Oscillator with Annular Cathode

Axially Extracted Virtual Cathode Oscillator with Annular Cathode

Effect of external magnetic field on critical current for the onset of virtual cathode oscillations in relativistic electron beams

A diode design study of the virtual cathode oscillator with a ring-type reflector

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