A novel coaxial Ku-band transit radiation oscillator without external guiding magnetic field

doi:10.1063/1.4866148

Cited by 18 publications

(5 citation statements)

References 18 publications

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“…[8,9] conducted were simulation and experiment on a low-magnetic coaxial transit-time oscillator, and the results showed that the experimental efficiency and simulation efficiency were almost the same, but the experimental efficiency was only about 20%. By introducing conducting foils, the device can operate without any external guiding magnetic field, [10] however, the IREB bombard conductive foil can easily generate plasma, which is not conducive to long pulse repetitive operation. For this reason, how to enhance both the power conversion efficiency and stability of the device, and further reduce the value of the external guiding magnetic field has become an urgent problem to be solved.…”

Section: Introductionmentioning

confidence: 99%

Novel compact and lightweight coaxial C-band transit-time oscillator*

Deng

Ling

et al. 2020

Chinese Phys. B

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Compactness and miniaturization have become increasingly important in the development of high-power microwave devices. Based on this rising demand, a novel C-band coaxial transit-time oscillator (TTO) with a low external guiding magnetic field is proposed and analyzed. The proposed device has the following advantages: simple structure, short axial length, high power conversion efficiency, and low external guiding magnetic field, which are of great significance for developing the compact and miniaturized high-power microwave devices. The application of a shorter axial length is made possible by the use of a transit radiation mechanism. Also, loading the opening foil symmetrically to both ends of the buncher helps reduce the external magnetic field of the proposed device. Unlike traditional foils, the proposed opening foil has a circular-hole; therefore, the electron beam will not bombard the conductive foil to generate plasma. This makes it possible to realize long pulse and high repetition rate operation of the device in future experiments. Through numerical calculation and PIC particle simulation, the stability of the intense relativistic electron beam (IREB) and the saturation time of the device are improved by using the conductive foil. The voltage and current of the diode are 548 kV and 11.4 kA, respectively. Under a 0.4-T external guiding magnetic field, a C-band output microwave with a frequency of 4.27 GHz and power of 1.88 GW can be generated. The power conversion efficiency of the proposed device is about 30%.

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Section: Introductionmentioning

confidence: 99%

Novel compact and lightweight coaxial C-band transit-time oscillator*

Deng

Ling

et al. 2020

Chinese Phys. B

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“…[1,2] Thus, as an attractive source, the MILO has been extensively studied in both theory and experiment since it was invented in 1987. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] At present, an HPM output of over 1 GW can be stably generated in the MILOs of L, S, and C bands, [3][4][5][6][7][8][9][10][11][12][13][14][15] In particular, Fan et al designed the L-band MILO that can generate 3.2 GW microwave output at 1.2 GHz, which is the top level in the world according to the reported literature. [15] In order to enhance the P f 2 factor, in which P and f are the output power and frequency of the microwave, respectively, the enhancement of operation frequency of the HPM resource is a development direction.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, due to the wide applications in digital communication field of the Kuband microwave, the Ku-band HPM source has become one of the major hotspots in the field of HPM research. [19][20][21][22][23][24][25][26][27] However, with the enhancement of the operation fre-quency, the size of the device is smaller. The power capacity becomes one restriction of the high frequency band HPM resources.…”

Section: Introductionmentioning

confidence: 99%

“…In 2013, Wen et al first conducted the research of Ku-band MILO. [19,20] But the device only produced a microwave with a power of 89 MW and pulse width of 16 ns in the experiment due to the small power capacity of the device and the erosion of the load area. [19,20] We also studied the Ku-band MILO and carried out the preliminary experiment in a traditional Ku-band MILO device, but the device only generated a microwave with a power of 150 MW and pulse width of 17 ns, which are inconsistent with the simulation results.…”

Section: Introductionmentioning

confidence: 99%

“…[19,20] But the device only produced a microwave with a power of 89 MW and pulse width of 16 ns in the experiment due to the small power capacity of the device and the erosion of the load area. [19,20] We also studied the Ku-band MILO and carried out the preliminary experiment in a traditional Ku-band MILO device, but the device only generated a microwave with a power of 150 MW and pulse width of 17 ns, which are inconsistent with the simulation results. [27] Analysis of the experimental results shows that the radio-frequency (RF) breakdown on the slow-wave-structure (SWS) is the main cause for the low microwave output power and short pulse width.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Ku-band magnetically insulated transmission line oscillator with overmoded slow-wave-structure

Jiang¹,

He²,

Zhang³

et al. 2016

Chinese Phys. B

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In order to enhance the power capacity, an improved Ku-band magnetically insulated transmission line oscillator (MILO) with overmoded slow-wave-structure (SWS) is proposed and investigated numerically and experimentally. The analysis of the dispersion relationship and the resonant curve of the cold test indicate that the device can operate at the near π mode of the TM01 mode, which is useful for mode selection and control. In the particle simulation, the improved Ku-band MILO generates a microwave with a power of 1.5 GW and a frequency of 12.3 GHz under an input voltage of 480 kV and input current of 42 kA. Finally, experimental investigation of the improved Ku-band MILO is carried out. A high-power microwave (HPM) with an average power of 800 MW, a frequency of 12.35 GHz, and pulse width of 35 ns is generated under a diode voltage of 500 kV and beam current of 43 kA. The consistency between the experimental and simulated far-field radiation pattern confirms that the operating mode of the improved Ku-band MILO is well controlled in π mode of the TM01 mode.

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Focusing electrode and coaxial reflector used for reducing the guiding magnetic field of the Ku-band foilless transit-time oscillator

Ling

Zhang

et al. 2014

Review of Scientific Instruments

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Based on the theoretical analysis of the intense relativistic electron beam propagation in the coaxial drift-tube, a focusing electrode and a coaxial reflector is proposed to lessen the demand of the coaxial Ku-band foilless transit-time oscillator (TTO) for the guiding magnetic field. Moreover, a Ku-band TTO with the focusing electrode and the coaxial reflector is designed and studied by particle in cell simulation. When the diode voltage is 390 kV, the beam current 7.8 kA, and the guiding magnetic field is only 0.3 T, the device can output 820 MW microwave pulse at 14.25 GHz by means of the simulation. However, for the device without them, the output power is only 320 MW. The primary experiments are also carried out. When the guiding magnetic field is 0.3 T, the output power of the device with the focusing electrode and the coaxial reflector is double that of the one without them. The simulation and experimental results prove that the focusing electrode and the coaxial reflector are effective on reducing the guiding magnetic field of the device.

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A novel coaxial Ku-band transit radiation oscillator without external guiding magnetic field

Cited by 18 publications

References 18 publications

Novel compact and lightweight coaxial C-band transit-time oscillator*

Novel compact and lightweight coaxial C-band transit-time oscillator*

A Ku-band magnetically insulated transmission line oscillator with overmoded slow-wave-structure

Focusing electrode and coaxial reflector used for reducing the guiding magnetic field of the Ku-band foilless transit-time oscillator

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