Quick Shot

Robert Henchen (Ph.D., 2018) aligns the all-reflective imaging Thomson-scattering telescope, shown with its cover removed, which collects and collimates Thomson-scattered light. It is transported to an instrumentation cart where it passes through a spectrometer and streak camera, shown behind in blue, to provide time- and spectrally resolved measurements of plasma conditions. With this instrument, nonlocal heat flux was measured using Thomson scattering from electron plasma waves. The relative amplitudes of Thomson-scattering features were affected by changes to the electron distribution function caused by temperature gradients. Time-resolved Thomson-scattering spectra from electron plasma waves are shown, in the inset, at three locations in the plasma. For more information, see LLE Review 155.