Fast-frame optical imaging and time-resolved spectroscopy of plasma in a gas discharge-based switch of a microwave pulse compressor

Summary form only given. Presently, mostly advanced microwave pulse compressors with plasma switches provide hundreds megawatt power in nanosecond pulses 1 . Nevertheless, in spite of significant progress in their development, no data existed on the nanosecond dynamics of the plasma formation under...

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Main Authors: Shlapakovski, Anatoli, Beilin, Leonid, Krasik, Yakov E.
Format: Conference Proceeding
Language:English
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Microwave imaging
Microwave measurement
Microwave technology
Optical imaging
Optical waveguides
Plasmas
Spectroscopy
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Beilin, Leonid
Krasik, Yakov E.
description Summary form only given. Presently, mostly advanced microwave pulse compressors with plasma switches provide hundreds megawatt power in nanosecond pulses 1 . Nevertheless, in spite of significant progress in their development, no data existed on the nanosecond dynamics of the plasma formation under strong microwave fields in pressurized gases that ultimately determine a compressor's output power. In this work, the evolution of the plasma formed in the S-band compressor was studied using fast-frame (2 ns) imaging and time-resolved spectroscopy. The compressor represented a rectangular waveguide-based cavity connected to an H-plane waveguide tee with a shorted side arm. The plasma discharge in the tee side arm was triggered by a Surelite laser. In experiments with optical imaging, the system was filled with dry air at up to 3·10 5 Pa pressure. It was found that the plasma appears as filaments with diameters of
doi_str_mv 10.1109/PLASMA.2015.7179776
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Presently, mostly advanced microwave pulse compressors with plasma switches provide hundreds megawatt power in nanosecond pulses 1 . Nevertheless, in spite of significant progress in their development, no data existed on the nanosecond dynamics of the plasma formation under strong microwave fields in pressurized gases that ultimately determine a compressor's output power. In this work, the evolution of the plasma formed in the S-band compressor was studied using fast-frame (2 ns) imaging and time-resolved spectroscopy. The compressor represented a rectangular waveguide-based cavity connected to an H-plane waveguide tee with a shorted side arm. The plasma discharge in the tee side arm was triggered by a Surelite laser. In experiments with optical imaging, the system was filled with dry air at up to 3·10 5 Pa pressure. It was found that the plasma appears as filaments with diameters of &lt;;0.6 mm expanding along the RF electric field with the typical velocity of ~5·10 7 cm/s. For time-resolved spectroscopy, the system was filled with helium at 2-10 5 Pa pressure. The nanosecond dynamics of plasma density was obtained by analyzing the shape of He I spectral lines: triplet 2s-3p (3888.65 Å) and triplet 2p-4d (4471.5 Å). Experimental data showed an evident correlation between the rise time of the plasma density and the peak power of the microwave output pulse: the density rise is steeper when the compressor output power is higher. The density reaches values of the order of 10 16 cm 3 . 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Presently, mostly advanced microwave pulse compressors with plasma switches provide hundreds megawatt power in nanosecond pulses 1 . Nevertheless, in spite of significant progress in their development, no data existed on the nanosecond dynamics of the plasma formation under strong microwave fields in pressurized gases that ultimately determine a compressor's output power. In this work, the evolution of the plasma formed in the S-band compressor was studied using fast-frame (2 ns) imaging and time-resolved spectroscopy. The compressor represented a rectangular waveguide-based cavity connected to an H-plane waveguide tee with a shorted side arm. The plasma discharge in the tee side arm was triggered by a Surelite laser. In experiments with optical imaging, the system was filled with dry air at up to 3·10 5 Pa pressure. It was found that the plasma appears as filaments with diameters of &lt;;0.6 mm expanding along the RF electric field with the typical velocity of ~5·10 7 cm/s. 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subjects Microwave imaging
Microwave measurement
Microwave technology
Optical imaging
Optical waveguides
Plasmas
Spectroscopy
title Fast-frame optical imaging and time-resolved spectroscopy of plasma in a gas discharge-based switch of a microwave pulse compressor
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