EFFECT OF BARRIER LAYERS IN BURNTHROUGH EXPERIMENTS WITH 351-NM LASER ILLUMINATION

被引:19
作者
DELETTREZ, J
BRADLEY, DK
JAANIMAGI, PA
VERDON, CP
机构
[1] Laboratory for Laser Energetics, University of Rochester, Rochester, NY 14623-1299
来源
PHYSICAL REVIEW A | 1990年 / 41卷 / 10期
关键词
D O I
10.1103/PhysRevA.41.5583
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
The time-resolved x-ray emission is measured from spherical targets consisting of glass shells overcoated with plastic in which thin signature layers are embedded. These targets are illuminated at 351 nm by the 24-beam OMEGA laser system at the Laboratory for Laser Energetics of the University of Rochester. We measure a large burnthrough rate for bare plastic targets that can only be replicated in one-dimensional hydrodynamic simulations with laser intensities in excess of ten times the nominal intensity. We observe that the burnthrough times are affected by the presence of a thin outer coating (barrier layer). The burnthrough times depend strongly on the barrier-layer material and thickness, whereas one-dimensional simulation results predict only a small effect. Several processes are considered to explain these results: illumination nonuniformity, early shinethrough of the laser light through the plastic, prepulses, filamentation, self-focusing of hot spots, and the Rayleigh-Taylor instability. We conclude that mixing due to the Rayleigh-Taylor instability, enhanced by early shinethrough, is the most probable cause of the observed large burnthrough rates. © 1990 The American Physical Society.
引用
收藏
页码:5583 / 5593
页数:11
相关论文
共 32 条
  • [1] VORTEX SIMULATIONS OF THE RAYLEIGH-TAYLOR INSTABILITY
    BAKER, GR
    MEIRON, DI
    ORSZAG, SA
    [J]. PHYSICS OF FLUIDS, 1980, 23 (08) : 1485 - 1490
  • [2] BIRKHOFF G, 1957, J MATH MECH, V6, P769
  • [3] LASER-INDUCED ELECTRIC BREAKDOWN IN SOLIDS
    BLOEMBER.N
    [J]. IEEE JOURNAL OF QUANTUM ELECTRONICS, 1974, QE10 (03) : 375 - 386
  • [4] BLOEMBERGEN N, 1988, 35 U ROCH LAB LAS EN, P125
  • [5] Bodner S. E., 1981, J FUSION ENERG, V1, P221, DOI [10.1007/BF01050355, DOI 10.1007/BF01050355]
  • [6] BODNER SE, COMMUNICATION
  • [7] BRADLEY DK, LASER INTERACTION RE, V9
  • [8] Chandrasekhar S., 1961, HYDRODYNAMIC HYDROMA
  • [9] EFFECT OF LASER ILLUMINATION NONUNIFORMITY ON THE ANALYSIS OF TIME-RESOLVED X-RAY MEASUREMENTS IN UV-SPHERICAL TRANSPORT EXPERIMENTS
    DELETTREZ, J
    EPSTEIN, R
    RICHARDSON, MC
    JAANIMAGI, PA
    HENKE, BL
    [J]. PHYSICAL REVIEW A, 1987, 36 (08): : 3926 - 3934
  • [10] RAYLEIGH-TAYLOR AND KELVIN-HELMHOLTZ INSTABILITIES IN TARGETS ACCELERATED BY LASER ABLATION
    EMERY, MH
    GARDNER, JH
    BORIS, JP
    [J]. PHYSICAL REVIEW LETTERS, 1982, 48 (10) : 677 - 680