Physics – Plasma Physics
Scientific paper
Nov 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aps..dpp.bo203g&link_type=abstract
American Physical Society, 41st Annual Meeting of the Division of Plasma Physics, November 15-19, 1999 Seattle, WA, abstract #BO
Physics
Plasma Physics
Scientific paper
We have performed ultraviolet Thomson scattering at the Nova laser facility to measure ion acoustic waves that are excited to large amplitudes by stimulated Brillouin scattering (SBS) from one Nova interaction beam (3 ω). The Nova beam has been smoothed with phase plates and has been operated with intensities of 0.04 - 8 × 10^15W cm-2. The electron temperature and flow velocity gradients have been measured with 90^circ Thomson scattering on thermal fluctuations and found to reach peak values of Te = 3 keV and LV = 0.6 mm, respectively. For the observation of stimulated ion waves, the scattering angle has been adjusted to 96^circ using a periscope in the Nova chamber to allow k-vector matching of the Thomson scattering and the stimulated ion wave k-vectors. Since we measure the scattering spectra temporally resolved with a 1m spectrometer and a streak camera, we can infer the amplitude of the ion acoustic wave compared to the amplitude of the thermal wave on each shot. We find a strong dependency of the ion wave amplitude on the intensity of the 3 ω interaction beam. We will discuss the spectral characteristics of the ion acoustic waves, possible effects of large-scale fluctuations, and saturation of the ion wave amplitude.
Geddes C. G.
Glenzer Siegfried H.
Kirkwood R. K.
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