Measurement of Electron Density Evolution by the Optical Fiber Interferometer on Theta Pinch Plasmas
international conference on plasma science(2021)
Abstract
A homodyne Mach–Zehnder (M-Z) optical fiber interferometer (OFI) based on the optical coupler demodulation with 1.55 μm wavelength is firstly developed for high plasma density measurement on the theta pinch (IMP-θ) plasmas in the Institute of Modern Physics for the research on magnetic-inertial fusion. The evolutions of center line-averaged electron density in the theta pinch discharges are measured by the interferometer. The OFI is full-fiber structure and the line-average electron number density resolution is 10 18 m -2 . The minimum time resolution of OFI is 1ns, depended on the bandwidth of terminal InGaAs detectors. Finally, the dynamics of theta pinch plasmas are reported, which are analyzed from the density waveforms under different gas pressures and charging voltages of capacitor banks. It shows the OFI is a highly reliable and flexible routine high plasma density diagnostic tool for theta pinch plasmas.
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Key words
flexible routine high plasma density diagnostic tool,electron density evolution,OFI,optical coupler demodulation,high plasma density measurement,center line-averaged electron density,theta pinch discharges,full-fiber structure,line-average electron number density resolution,density waveforms,highly reliable plasma density diagnostic tool,homodyne Mach-Zehnder optical fiber interferometer,magnetic-inertial fusion,terminal InGaAs detectors,theta pinch plasma dynamics,gas pressures,charging voltages,capacitor banks,wavelength 1.55 mum,InGaAs
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