A Pockels cell enabled heterodyne phase contrast imaging diagnostic for detection of ion cyclotron emission

This work describes a novel optical heterodyne detection scheme that significantly extends the frequency response of the phase contrast imaging method to detect electron density fluctuations in tens of megahertz frequency range. The system employs a variable frequency electro-optic modulator to allo...

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Bibliographic Details
Published in:Review of scientific instruments 2022-08, Vol.93 (8), p.083502-083502
Main Authors: Marinoni, A., Moeller, C. P., Rost, J. C., Porkolab, M., Edlund, E. M.
Format: Article
Language:English
Subjects:
Cyclotrons
Electron density
Emission
Frequency ranges
Frequency response
Magnetic probes
Phase contrast
Pockels cells
Scientific apparatus & instruments
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Summary:This work describes a novel optical heterodyne detection scheme that significantly extends the frequency response of the phase contrast imaging method to detect electron density fluctuations in tens of megahertz frequency range. The system employs a variable frequency electro-optic modulator to allow operation at any frequency in the range 10–40 MHz without the need to realign the system. The frequency coverage of the system makes it suitable to measure the radial structure of the electron density component of ion cyclotron emission on devices having confining magnetic field of a few tesla, thus extending the purely temporal measurements provided so far by magnetic probes.
ISSN:0034-6748
1089-7623
DOI:10.1063/5.0101715