Spectroscopic Measurement of High-Density CO2-Laser-Driven Implosion

Abstract

C0 2 -laser--driven implosions have been shown to produce compressed plasma densities of the same magnitude as ordinary solids (>2 g/cm 3 ). A variety of diagnostic techniques has been used, including the simultaneous observation of x-ray spectroscopic signatures and nuclear yield. The laser energy on target ranged from 3 to 6 kJ and the half width of the pulse was 600-800 ps. The results of these experiments are compared with numerical hydrodynamic simulations.

Atomic Processes in High-Density Plasmas

“…For fully stripped ions, the potential v(q) is simply: vlq) = 4HQe/q Z The structure factor S(q) is given in Eq. (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18). With these approximations, the electron mean-free-path is:…”

“…(4-15) is regarded as an effective or model Harailtonian, it satisfies Koopman's theorem with the eigenvalue E n of Eq. (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14). This property is required for thermodynamic consistency.…”

“…(4-1, 4-3) or in the algebraic screened hydrogenic model of Eqs. (4)(5)(6)(7)(8) to (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15).…”

“…For thermal equilibrium applications of the average-atom model, the integer population P n is replaced by an average population calculated from Fermi statistics, (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16) where D" = 2n 2 is the shell degeneracy. The energy EQ appearing in (4-16) is obtained by consistently solving Eqs.…”

“…Implosion experiments diagnosed by broadening of n^on or argon emission lines show plasma electron densities in the range 10 to 10 4 cm" 3 lYaakobi et al 6 ; Hauer, Mitchell et al 7 ; Kilkenny, Lee et al ). The analysis of line widths and intensity ratios is an important specialized branch of the atomic physics of dense plasmas (Griem,' Hooper et al,*" Hauer,"• and Key").…”