TARGET COMPUTATIONS FOR LASER THERMONUCLEAR FUSION BY CODE "ZARYA" MODEL OF LASER RADIATION ABSORPTION BY A SPHERICAL TARGET

E. N. Avrorin, A. I. Zuev, Yu. N. Lasarev, V. A. Lykov, N. P. Sitnikov, O. S. Shirokovskaya
VANT. Ser. Metodiki i Programmy Chislennogo Resheniya Zadach Matematicheskoy Fiziki 1985. Вып.2. С. 10-20.

      Dependences of density profile steepening parameters under action of pondermotive forces, as well as resonance and parametric absorption coefficints at incidence of s- and p-polarized electromagnetic wave onto flat plasma layer are obtained on the basis of numerical solution of the set of contracted Maxwell equations combined with isothermal quasi-static plasma flow equat ions.
      The model of absorption of laser radiation by spherical target is formulated, allowing to compute back-bremsstrahlung, resonance, and parametric absorption taking into account refraction of laser radiation in the corona, density profile steepening, and Mandelstam-Bri1louin forced scattering. One-group fast-electron energy transfer equation is proved.

      Comparison between computational and test results with gas-filled glass shells is made on a number of devices at various laser pulse lengths, energy flow densities, wave lengths, and conit ions of laser radiation focusing. The computational results are shown to agree with tests as for amount of energy absorbed, gas compression, neutron yield, x-ray spectra, and obscurograms. Results of target optimization for lTw neodymium glass device, as well as of target calculations for obtaining thermonuclear burst and hybrid thermonuclear reactor on the basis of laser themro- nuclear fusion at various wave lengths of laser radiation are presented.