Physics – Plasma Physics
Scientific paper
Nov 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..dpphp1022j&link_type=abstract
American Physical Society, 46th Annual Meeting of the Division of Plasma Physics, 15-19 November, 2004, Savannah, GA. MEETING I
Physics
Plasma Physics
Scientific paper
Evidence for self-sustained, undamped modes at or near the electron thermal velocity have been observed in experiments (D. S. Montgomery et al, Phys. Rev. Lett., 87, 155001 (2001)). Such modes have also been excited in 1D Vlasov simulations (B. B. Afeyan et al, Paper MO3.4, Proceedings of the 2003 IFSA conference (2003).). The main features of this mode are that their fundamental frequency is significantly below the plasma frequency, that their phase velocity is near the thermal velocity, and that the modes include features in phase space that correspond to trapped particles so that the self-consistent distribution function is not a Maxwellian. Using two counter-propagating lasers to set up a slow moving ponderomotive potential, we have been able to set up phase-space modifications similar to those observed by Afeyan et al. We will present 1D and 2D results using the particle-in-cell code OSIRIS, and we will discuss the connection between these simulation results to experiments done on the MARS and NEPTUNE lasers.
Joshi Chaitanya
Mori Warren B.
Tsung F. S.
Winjum B. J.
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