Cryogenic deuterium target experiments with the GEKKO XII, green laser system

A series of experiments were conducted using cryogenic deuterium targets to study fundamental physics and implosion dynamics with the GEKKO XII glass laser system [IEEE J. Quantum Electron. QE‐17, 1639 (1981)]. Preheat sources were found to be due to a shock wave and hot electrons. A new method to measure the fuel ρR using proton spectra was employed. Measured in detail were the implosion dynamics of cryogenic deuterium foam with a plastic ablator and a CH shell with a controlled pressure of deuterium gas targets. Under current experimental conditions sources of nonuniformity were discussed in terms of Rayleigh–Taylor instability.

[1]  Kunioki Mima,et al.  Random Phasing of High-Power Lasers for Uniform Target Acceleration and Plasma-Instability Suppression , 1984 .

[2]  K. Nishihara,et al.  Deflagration Waves in Laser Compression. I , 1978 .

[3]  Bradley,et al.  Cryogenic-laser-fusion target implosion studies performed with the OMEGA uv-laser system. , 1989, Physical review. A, General physics.

[4]  S. P. Obenschain,et al.  Reduction of 3ω0/2 emission from laser‐produced plasmas with broad bandwidth, induced spatial incoherence at 0.53 μm , 1991 .

[5]  Kokichi Tanaka,et al.  Cryostat to provide a solid deuterium layer in a plastic shell for the Gekko XII glass laser system , 1992 .

[6]  Meyer,et al.  Measurement of two plasmon decay instability development in k space of a laser produced plasma and its relation to 3/2-harmonic generation. , 1993, Physical review letters.

[7]  Takayoshi Norimatsu,et al.  Fabrication of a cryogenic foam target for inertial confinement fusion experiments , 1988 .

[8]  Richard.  Stability of the hydrogen and hydrogenlike molecules. , 1994, Physical review. A, Atomic, molecular, and optical physics.

[9]  Hiroshi Azechi,et al.  Experimental determination of fuel density‐radius product of inertial confinement fusion targets using secondary nuclear fusion reactions , 1986 .

[10]  Hiroshi Azechi,et al.  RECENT PROGRESS IN LASER FUSION RESEARCH AT OSAKA UNIVERSITY : UNIFORMITY AND STABILITY ISSUES , 1994 .

[11]  Furukawa,et al.  Fermi-degeneracy and discrete-ion effects in the spherical-cell model and electron-electron correlation effects in hot dense plasmas. , 1992, Physical review. A, Atomic, molecular, and optical physics.

[12]  W. Manheimer,et al.  Steady‐state planar ablative flow , 1981 .

[13]  M. Takagi,et al.  Development of foam shells for cryogenic laser fusion target , 1991 .

[14]  Haan.  Onset of nonlinear saturation for Rayleigh-Taylor growth in the presence of a full spectrum of modes. , 1989, Physical review. A, General physics.

[15]  Manabu Heya,et al.  Laser‐imploded core structure observed by using two‐dimensional x‐ray imaging with 10‐ps temporal resolution , 1995 .

[16]  Stephen E. Bodner,et al.  Critical elements of high gain laser fusion , 1981 .

[17]  Kunioki Mima,et al.  Self‐consistent growth rate of the Rayleigh–Taylor instability in an ablatively accelerating plasma , 1985 .

[18]  M. Takagi,et al.  A novel technique to make foam shells with high sphericity and wall uniformity for cryogenic laser fusion targets , 1991 .

[19]  Takayoshi Norimatsu,et al.  Development of foam shell with plastic ablator for cryogenic laser fusion target , 1993 .

[20]  S. Nakai,et al.  Performance of thermal cavitation technique for fuel loading in spherical cryogenic foam target for laser fusion , 1991 .

[21]  Koji Tsubakimoto,et al.  Partially coherent light generated by using single and multimode optical fibers in a high‐power Nd:glass laser system , 1993 .

[22]  Takayasu Mochizuki,et al.  Nd-doped phosphate glass laser systems for laser-fusion research , 1981 .

[23]  J. D. Kilkenny,et al.  A review of the ablative stabilization of the Rayleigh--Taylor instability in regimes relevant to inertial confinement fusion , 1994 .