High-Average-Power Second Harmonic <i>W</i>-Band Gyrotron With Room-Temperature Solenoid

Pilossof, Moritz; Einat, Moshe

doi:10.1109/ted.2020.2971653

Cited by 6 publications

(2 citation statements)

References 11 publications

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“…These waves are generated by a Gyrotron, which is a vacuum electron tube where accelerated electrons are manipulated by a strong magnetic field into a resonator where the kinetic energy is partially converted into an electromagnetic radiation. The radiation frequency is determined mainly by the magnetic field, roughly S × 28 GHz/T are obtained where S is the harmonic number (Kumar et al 2016 ; Pilossof and Einat 2020 ).…”

Section: Introductionmentioning

confidence: 99%

“…In addition, in low enough power density, 95 GHz is much less dangerous for humans then other means of decontamination such as UV irradiation and ethylene oxide (Karipidis et al 2021 ), and can even be useful for cancer treatment to irradiate malignant tumors (Miyoshi et al 2016 ). Here we used a 95 GHz gyrotron with ~ 10 kW output power (Pilossof and Einat 2020 ) to irradiate poliovirus and human coronavirus 229E. The 229E virus is responsible for upper respiratory tract infections that occasionally cause pneumonia (Hamre and Procknow 1966 ; Greenberg 2016 ) and is a common model for SARS-CoV-2.…”

Section: Introductionmentioning

confidence: 99%

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Corona and polio viruses are sensitive to short pulses of W-band gyrotron radiation

et al. 2021

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The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pandemic has raised the need of versatile means for virus decontamination. Millimeter waves are used in biochemical research in dynamic nuclear polarization enhanced nuclear magnetic resonance (DNP/NMR) spectroscopy. However, their efficiency in object decontamination for viruses has not been tested yet. Here we report the high efficiency of 95 GHz waves in killing both coronavirus 229E and poliovirus. An exposure of 2 s to 95 GHz waves reduced the titer of these viruses by 99.98% and 99.375%, respectively, and formed holes in the envelope of 229E virions as detected by scanning electron microscopy (SEM) analysis. The ability of 95 GHz waves to reduce the coronavirus titer to a range of limited infective dose of SARS-CoV-2 for humans and animal models along with precise focusing capabilities for these waves suggest 95 GHz waves as an effective way to decontaminate objects.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Corona and polio viruses are sensitive to short pulses of W-band gyrotron radiation

et al. 2021

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Hard Rock Absorption Measurements in the W-Band

Shteinman,

Anker,

Einat

2024

J Infrared Milli Terahz Waves

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Design and experiment of an inverse magnetron injection gun for a Ka-band gyro-TWT with non-superconducting magnet

Dai,

Yao,

Jiang

et al. 2024

Physics of Plasmas

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A triode inverse magnetron injection gun (IMIG) for a Ka-band gyrotron traveling wave tube (gyro-TWT) with non-superconducting magnet is proposed in this paper. Nowadays, the applications of gyro-TWT are intended to expand to moveable and fast-startup systems, so room-temperature magnet and system miniaturization are necessary. For a Ka-band gyro-TWT, to adapt to a room-temperature magnet with 20 mm bore radius, the IMIG form is adopted. Compared with conventional MIG, the gun maximum radius is reduced by 44%. On one hand, a curved emitter and cathode steps are utilized for better beam quality. On the other hand, isolation gaps and a cooling structure are designed to suppress stray electrons. A velocity ratio of 1.14 and a transverse velocity spread of 2.43% are obtained finally. The stray electrons are analyzed, and the IMIG tolerance is also evaluated. Finally, the cathode is fabricated, and its surface morphology is tested. It is then assembled into a gun shell, and the cathode temperatures are measured under both no cooling and cooling conditions. When the temperature of the emitter reaches 1050 °C, the heat powers are 84 and 115 W, respectively. The temperatures of the inner and outer electrodes are low enough to reduce the proportion of stray electrons.

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High-Average-Power Second Harmonic W-Band Gyrotron With Room-Temperature Solenoid

Cited by 6 publications

References 11 publications

Corona and polio viruses are sensitive to short pulses of W-band gyrotron radiation

Corona and polio viruses are sensitive to short pulses of W-band gyrotron radiation

Hard Rock Absorption Measurements in the W-Band

Design and experiment of an inverse magnetron injection gun for a Ka-band gyro-TWT with non-superconducting magnet

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