Diagnostic of ultrafast temporal plasma evolution in high-power microwave discharge

For the most advanced multi-frame camera in the world, the shortest response time between two frames is no shorter than 1.5 ns. Thus, there is no effective way to diagnose the ultrafast sub-nanosecond dynamic of a microwave-driven plasma discharge in a single pulse. Different-length multi-sub-beam o...

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Bibliographic Details
Published in:Journal of applied physics 2017-06, Vol.121 (21)
Main Authors: Chang, C., Wu, C., Pu, Y. K., Zhu, M., Zhang, X., Verboncoeur, J.
Format: Article
Language:English
Subjects:
Cameras
Diagnostic systems
Electron density
Evolution
Frames
High power microwaves
Microwave discharge
Optical fibers
Plasma dynamics
Plasma jets
Response time
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Summary:For the most advanced multi-frame camera in the world, the shortest response time between two frames is no shorter than 1.5 ns. Thus, there is no effective way to diagnose the ultrafast sub-nanosecond dynamic of a microwave-driven plasma discharge in a single pulse. Different-length multi-sub-beam optical fibers, together with a spectrometer and an EMICCD camera, are proposed and designed to detect the nanosecond discharge spectra in a single pulse, like a real-time multi-frame spectral camera. This novel method could realize a time interval between two consecutive frames shorter than 0.1 ns by a length difference of 2 cm for sub-fibers, achieving the measurement of ultrafast plasma dynamics. Temporal evolution of electron density as well as energy of electrons and ions during nanosecond microwave discharge is further studied by de-convolving the Stark broadening and thermal Doppler broadening and by calculating the ratio of emission coefficients.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4984014