Title :
Simulation of vapor formation for the LEVIS lithium ion source
Author :
Sweeney, M.A. ; Nelson, W.E.
Author_Institution :
Sandia Nat. Lab., Albuquerque, NM, USA
Abstract :
Summary form only given. The laser evaporation ion source (LEVIS) is an active ion source developed for light ion inertial confinement fusion. A 1.06 /spl mu/m neodynium YAG laser creates a neutral vapor from a thin (0.2-0.5 /spl mu/m) lithium-rich surface. An incident energy density of 0.1-0.2 J/cm/sup 2/ is needed to form a thin vapor layer near the anode with a short-pulse (8 ns FWHM) laser. Lithium vapor formation at these energy densities is being modeled. Different models for the reflectivity and opacity of lithium-bearing metals affect the temperature and density profiles in the anode-cathode gap and the expansion velocity of the neutral vapor obtained with the radiation/hydrodynamics code, TITAN. The calculated time-dependent density and temperature profiles from the Nd:YAG laser vaporization will be used to interpret the spectroscopic and refractive-index-gradient data and as input to a code that calculates the resonant ionization produced by the dye laser.
Keywords :
ion sources; 0.2 to 0.5 micron; 1.06 micron; 8 ns; LEVIS; Li; Nd:YAG laser; TITAN; YAG:Nd; YAl5O12:Nd; active ion source; anode-cathode gap; density profiles; dye laser; expansion velocity; laser evaporation ion source; light ion inertial confinement fusion; opacity; radiation/hydrodynamics code; reflectivity; refractive-index-gradient data; resonant ionization; temperature profiles; time-dependent density; vapor formation; Anodes; Hydrodynamics; Inertial confinement; Ion sources; Laser fusion; Laser modes; Lithium; Reflectivity; Surface emitting lasers; Temperature;
Conference_Titel :
Plasma Science, 1993. IEEE Conference Record - Abstracts., 1993 IEEE International Conference on
Conference_Location :
Vancouver, BC, Canada
Print_ISBN :
0-7803-1360-7
DOI :
10.1109/PLASMA.1993.593572
