Fast Charge Exchange Spectroscopy for Measurements of Ion-Velocity-Space Distribution Function

Fast charge exchange spectroscopy of C VI (Δn = 8−7, λ = 529.05 nm) has been developed to measure the ion-velocity-space distribution function. The fast charge exchange spectroscopy system consists of an F2.8 lens spectrometer, image intensifier, and high-speed camera. To maximize photon count, we efficiently accumulate light from 50 optical fibers (400 μm core) into one spatial channel. By applying a curved multi-slit, one spectrometer has four spatial channels. This system has good time resolution with a frequency of 10 kHz beyond that of ion-ion collision and excellent accuracy (signal-to-noise ratio), enough to detect the deformation of carbon ion-velocity distribution from Maxwell-Boltzmann distribution.