Measurements of laser wavelength scaling ion acoustic decay instability and associated effects in laser-plasma interaction experiments
- California Univ., Davis, CA (USA)
- Rochester Univ., NY (USA). Lab. for Laser Energetics
We have made extensive studies of Ion Acoustic Decay Instabilities (IADI) in laser-pellet interactions under the program of the National Laser User Facility at LLE. We have observed well-defined IADI. In this paper it is shown that IADI is potentially important in laser fusion applications. The threshold decreased as the laser spot size increased. The measured threshold is an order of magnitude lower that previously reported values in small spot experiments. The threshold values for IR and short wavelength Green lasers are quite low, and reached homogeneous-plasma collisional values in a planar plasma produced by a large spot size laser irradiations. The results are explained in agreement with LASNEX calculations with a flux limit of f = 0.1. These low threshold values indicate that IADI is potentially important in a large scale plasma, and even in short-wavelength laser-pellet interactions which are applicable to laser fusion research. It is shown that IADI is a useful tool for plasma diagnostic near the critical surface. We have shown that ion charge state Z can be measured using IADI signals. These measurements are possible without resorting to any complicated atomic physics model. At high intensity regimes, IADI spectrum is quite different from the medium intensity regime. A broad turbulent-like spectrum is observed.
- Research Organization:
- California Univ., Davis, CA (USA)
- Sponsoring Organization:
- DOE/DP
- DOE Contract Number:
- AS03-88DP10779
- OSTI ID:
- 7091539
- Report Number(s):
- DOE/DP/10779-T1; ON: DE90011434
- Country of Publication:
- United States
- Language:
- English
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LASER-PRODUCED PLASMA
PLASMA INSTABILITY
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ION ACOUSTIC WAVES
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ION WAVES
PELLETS
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