Final Report of the OME-SSI experiments conducted on the Omega Laser at lee as part of the NLUF program in FY' 00 via grant DE-FG03-00SF22025.
We have used the Omega laser facility at LLE, Rochester, as part of the NLUF program, to study the physics of parametric instabilities in overlapping lasers beams. In FY' 00 we invented a new technique of analyzing the SRS data by resolving it into wavelength and time windows where SRS suppression or large reduction was found. This innovation allows the location of space-time windows where the presence of a large amplitude ion acoustic wave at the Mach-1 surface of the exploding foil plasma causes SRS reduction only if the product of the intensities of the pump and probe beams is high enough. In two sets of experiments we explored two new areas of interaction. One involved using a much higher intensity pump beam, getting higher levels of Raman backscatter and being able to suppress it just as well with optical mixing generated IAWs. The second involves changing the focusing position of the pump and probe beams independently as well as the pump energy so as to see the scaling of the energy transfer and SRS suppression on these parameters. We perfected our data reduction codes SRS{_}RDX and SBS{_}RDX to include our new data analysis routines and to incorporate the changes to the diagnostics that have occurred.
- Research Organization:
- Polymath Research Inc. Pleasanton, CA (US)
- Sponsoring Organization:
- (US)
- DOE Contract Number:
- FG03-00SF22025
- OSTI ID:
- 794138
- Country of Publication:
- United States
- Language:
- English
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