A compact high-power microwave metamaterial slow-wave structure: From computational design to hot test validation

Prasad, Sudhakar; Yurt, Sabahattin C.; Shipman, Kevin; Andreev, Dmitrii; Reass, Daniel; Fuks, Mikhail; Schamiloglu, E.

doi:10.1109/cem.2017.7991887

Cited by 8 publications

(2 citation statements)

References 5 publications

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“…[10][11][12][13][14][15][16][17][18] However, a very few experiments have been carried out to actually generate high power microwaves with an electron beam passing through an MTM structure. [19][20][21][22][23] At MIT, in our previous experiment, 19 we built a structure with two MTM plates loaded in a waveguide with dimensions below the cut-off of the TM 11 mode. The implementation we chose is the complementary split ring resonators (CSRRs).…”

Section: Introductionmentioning

confidence: 99%

High power long pulse microwave generation from a metamaterial structure with reverse symmetry

Stephens

Mastovsky

et al. 2018

Physics of Plasmas

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Experimental operation of a high power microwave source with a metamaterial (MTM) structure is reported at power levels to 2.9 MW at 2.4 GHz in full 1 μs pulses. The MTM structure is formed by a waveguide that is below cutoff for TM modes. The waveguide is loaded by two axial copper plates machined with complementary split ring resonators, allowing two backward wave modes to propagate in the S-Band. A pulsed electron beam of up to 490 kV, 84 A travels down the center of the waveguide, midway between the plates. The electron beam is generated by a Pierce gun and is focused by a lens into a solenoidal magnetic field. The MTM plates are mechanically identical but are placed in the waveguide with reverse symmetry. Theory indicates that both Cherenkov and Cherenkov-cyclotron beam-wave interactions can occur. High power microwave generation was studied by varying the operating parameters over a wide range, including the electron beam voltage, the lens magnetic field, and the solenoidal field. Frequency tuning with a magnetic field and beam voltage was studied to discriminate between operation in the Cherenkov mode and the Cherenkov-cyclotron mode. Both modes were observed, but pulses above 1 MW of output power were only seen in the Cherenkov-cyclotron mode. A pair of steering coils was installed prior to the interaction space to initiate the cyclotron motion of the electron beam and thus encourage the Cherenkov-cyclotron high power mode. This successfully increased the output power from 2.5 MW to 2.9 MW (450 kV, 74 A, 9% efficiency).

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Section: Introductionmentioning

confidence: 99%

High power long pulse microwave generation from a metamaterial structure with reverse symmetry

Stephens

Mastovsky

et al. 2018

Physics of Plasmas

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“…This is based on the two facts: (1) the subwavelength properties of CeSRRs contribute to device miniaturization; (2) the strongly resonant behaviors due to the internal effective capacitance and inductance of CeSRRs [13] result in the enhancement of the electric fields in the localized interaction region [14] and is beneficial to the high power and high efficiency of the device. There have been a number of experimental demonstrations of metamaterial-inspired high power microwave devices, such as research groups of Temkin et al [11], [15], [16], Schamiloglu et al [17], [18], Shiffler et al [19], and Duan et al [9], [20] obtained MW-or kW-level output power in L-, S-, C-, and X-bands.…”

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confidence: 99%

Experimental Demonstration of Compact S-Band MW-Level Metamaterial-Inspired Klystron

Wang

Zhang

Zou³

et al. 2023

IEEE Electron Device Lett.

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Metamaterials are artificially constructed subwavelength structures exhibiting unprecedented electromagnetic phenomena. In this letter, an S-band MW-level metamaterial-inspired klystron using all-metal complementary electric split ring resonators (CeSRRs) was realized in the experiment. The CeSRR-loaded interaction structure of the klystron developed here features a miniaturized structure, the volume of which is only about 0.44 of the conventional counterparts. The metamaterial-inspired klystron based on the interaction structure loaded with CeSRRs was designed, fabricated and assembled. Using a pencil beam with parameters of 120 kV/80 A in the hot-test, the klystron delivered the biggest output power of 5.51 MW with gain of 55.6 dB and electronic efficiency of 57.4% at 2.852 GHz. This compact metamaterial-inspired klystron has potential applications in proton therapy facilities, tokamaks for the low-hybrid wave heating, and accelerators.

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Metamaterial assisted microwave tubes: a review

Guha

Wang

Tang

et al. 2021

Journal of Electromagnetic Waves and Applications

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A compact high-power microwave metamaterial slow-wave structure: From computational design to hot test validation

Cited by 8 publications

References 5 publications

High power long pulse microwave generation from a metamaterial structure with reverse symmetry

High power long pulse microwave generation from a metamaterial structure with reverse symmetry

Experimental Demonstration of Compact S-Band MW-Level Metamaterial-Inspired Klystron

Metamaterial assisted microwave tubes: a review

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