Laser-Induced Fluorescence Plasma Ion Diagnostics

NASA Astrophysics Data System (ADS)

In nearly 25 years plasma laser-induced fluorescence (LIF) has evolved from proof-of-principle experiments.(R. Stern and J. Johnson, Phys. Rev. Lett. 34, 1548 (1975).) to using the latest advances in diodes lasers.(G.D. Severn, D.A. Edrich, and R. McWilliams, Rev. Sci. Instrum. 69, 10 (1998).) LIF can provide time- and space-resolved plasma ion distribution, f_i(x,v,t), measurements (typically on ?sec and mm scales) with velocity resolution of a few tens of m/sec. Via optical tagging instrumentation.(R.A. Stern, D.N. Hill, and N. Rynn, Phys. Lett. A93, 127 (1983).) diffusion and convection can be studied in real space and velocity space in quiet or turbulent plasmas.(R. McWilliams and M.K. Okubo, Phys. Fluids 30, 2849 (1987), R. McWilliams, M.K. Okubo, and N.S. Wolf, Phys. Fluids B2, 523 (1990), J. Bowles, R. McWilliams, and N. Rynn, Phys. Plasmas 1, 3814 (1994).) Non-Maxwellian multi-dimensional ion distributions can be studied by optical tomography.(M. Zintl and R. McWilliams, Rev. Sci. Instrum. 65, 2574 (1994).) Examples of LIF's flexibility are: diagnosis of tokamak plasma ions,(S.J. Sanders, P.M. Bellan, and R. Stern, Phys. Plasmas 5, 716 (1998).) measures of nonlinear propagation of ion structures,(G. Bachet, F. Skiff, M. Dindelegan, F. Doveil, and R.A. Stern, Phys. Rev. Lett. 80, 3260 (1998).) and helping in the design of plasma processing apparatus.(M. Goeckner, J. Goree, and T.E. Sheridan, Phys. Fluids B3, 2913 (1991).) This talk will present LIF diagnostic equipment for plasma physics ion measurements. While laser technology has broadened LIF usefulness there remain pitfalls to its application in some arenas. This tutorial adumbration is posted at http://HAL9000.ps.uci.edu .

McWilliams, Roger

1999-11-01