Experimental setup for time resolved LIF diagnostic: PHPS—pulsed helicon plasma source, IN—injection optics, AN—antenna, CO—collection optics, BD—beam dump, EM—electromagnets, PMT—photomultiplier tube, OF—optical fiber, OC—optical coupler, AOM—acousto-optic modulator, PHD—photodiode, and BS—beam splitter.
(a) The LIF signal amplitude dependence vs chopping frequency (2—, (Š—, 1— integration times). (b) The LIF signal amplitude dependence vs integration time for chopping frequency. (c) The relative intensity of the AOM transmitted light in the first diffraction order vs Bragg angle misalignment. (d) The dependence of LIF signal amplitude vs injected laser power density.
(a) Raw LIF signal during the discharge pulse (only 3 of 25 wavelengths are plotted). (b) Oscillations of the LIF signal amplitude observed on the first of the pulse (as insert) and corresponding power spectrum showing oscillation frequency. (c) LIF signal after low pass filtering. (d) Argon ion vdf at into the pulse.
(a) Contour plot of the evolution of the argon ion vdf during the pulse with time resolution. (b) Evolution of the LIF signal amplitude (continuous line) and ion flow velocity (dashed line) during the pulse.
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