Download or read book Plasma Experiments with 1 06 Mu M Lasers at Lawrence Livermore Laboratory written by and published by . This book was released on 1976 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent laser fusion experiments at Lawrence Livermore Laboratory have provided basic data concerning laser beam propagation and absorption in high temperature plasmas, electron energy transport processes that transfer the absorbed laser energy to the high density ablation region, the general fluid dynamic expansion and compression of the heated plasma, and the processes responsible for the production of 14 MeV neutrons during implosion experiments. This paper reports results related to the propagation, absorption and scattering of laser light by spherical and planar targets.
Download or read book Plasma Experiments with 1 06 Mu M Lasers at the Lawrence Livermore Laboratory written by and published by . This book was released on 1976 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent laser fusion experiments at the Lawrence Livermore Laboratory have provided basic data concerning: laser beam propagation and absorption in high temperature plasmas, electron energy transport processes that transfer the absorbed laser energy to the high-density ablation region, the general fluid dynamic expansion and compression of the heated plasma, and the processes responsible for the production of 14-MeV neutrons during implosion experiments. Irradiation experiments were performed with Nd:YAG glass laser systems: the two-beam Janus (less than or equal to40 J/100 ps, approx.0.4 TW) and Argus (less than or equal to140 J, 35 ps, approx. 4 TW), and the single beam Cyclops (less than or equal to70 J/100 ps, approx.0.7 TW). Two classes of targets have been used: glass microshells (approx. 40 to 120 .mu.m in diameter with approx.0.75-.mu.m-thick walls) filled with an equimolar deuterium-tritium mixture, and disks (approx. 160 to 600 .mu.m in diameter and approx. 10 .mu.m thick) of several compositions. The targets were supported in vacuum (pressure less than or equal to10−5 Torr) by thin glass stalks. This paper reports on results related to the propagation, absorption, and scattering of laser light by both spherical and planar targets.
Download or read book ARGUS Laser Plasma Experiments at 1 06 Mu M 0 53 Mu M and 0 35 Mu M written by and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ARGUS wavelength scaling experiments have been performed on low (Be) and high (Au) Z disk targets, with laser wavelengths of 1.06 .mu.m, 0.53 .mu.m and 0.35 .mu.m. The laser provided a 700 psec pulse, with up to 100J and 1.06 .mu.m; 200J at 0.53 .mu.m; and 40J at 0.35 .mu.m. Laser intensities on target ranged from 3 x 1013 to over 3 x 1015W/cm2, using an f/2.2 focusing system. Box calorimeter measurements show the expected increasing fractional absorption at shorter laser wavelengths; absolutely calibrated hard x-ray detectors show the number of suprathermal electrons to be greatly decreased. Scattered light measurements concentrated on stimulated Raman scattering, and the 3/2 harmonic. The SRS was spectrally and temporally resolved during 0.53 .mu.m irradiations; our measurements showed the scattering to be principally from the convective instability, near tenth critical density. Near .omega./2, a double peaked spectral feature is observed. The time resolved data show a number of interesting features, which are discussed.
Download or read book Laser Plasma Experiments Relevant to Laser Produced Implosions written by and published by . This book was released on 1974 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Laser plasma Instabilities in Large Plasmas Irradiated at 1 06 Mu M and the Wavelength Scaling of the Absorption Hot electron Production Ablation Pressure for 1 06 0 53 and 0 35 Mu M Light written by and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Plasmas were created by exploding 7000 A thick CH foils at the irradiation conditions: 1.064 .mu.m, 3 kJ, 2.5 x 1015 W/cm2, 900 ps FWHM, 400 .mu.m spot diameter. Ten percent of the laser energy appeared as Raman light and 0.04% as 3.omega.0/2 light. The 3.omega.0/2 light and the 30-70 keV X rays occurred simultaneouly at t=-120/sup +50/200 psec and lasted only 300 psec FWHM. The foil was calculated to explode to n/sub c/4 at t=-300 psec. The spectrum and angular distribution of the Raman light were also measured. Time-resolved spectral measurements have been made in experiments with 5320 A laser light in a 600-900 psec FWHM pulse. The scaling of the 3.omega.0/2 light with both the laser spot size and pulse length has been studied.
Download or read book Laser Fusion Experiments at 2 TW Argus System Implosion of D T Filled Glass Microspheres written by and published by . This book was released on 1976 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Lawrence Livermore Laboratory Solid State Laser System, Arqus, has successfully performed laser implosion experiments at power levels exceeding 2 TW. D-T filled glass microspheres have been imploded to yield thermonuclear reaction products in excess of 5 x 108 per event. Neutron and .cap alpha. time-of-flight measurements indicate that D-T ion temperatures of approximately 5-6 keV and a density confinement time product (n tau) of approximately 1 x 1012 were obtained in these experiments. Typically two 40J, 40 psec pulses of 1.06 .mu.m light were focused on targets using 20 cm aperture f/1 lenses, producing intensities at the target in excess of 1016 W/cm2. An extensive array of diagnostics routinely monitored the laser performance and the laser target interaction process. Measurements of absorption and asymmetry in both the scattered light distribution and the ion blow off is evidence for non-classical absorption mechanisms and density scale heights of the order of 2 .mu.m or less. The symmetry of the thermonuclear burn region is investigated by monitoring the .cap alpha.-particle flux in several directions, and an experiment to image the thermonuclear burn region is in process. These experiments significantly extend our data base and our understanding of laser induced thermonuclear implosions and the basic laser plasma interaction physics from the 0.4 to 0.7 TW level of previous experiments.
Download or read book Laser Fusion Experiments at 2 TW ARGUS Implosions of D T Microspheres written by and published by . This book was released on 1976 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Lawrence Livermore Laboratory Solid State Laser System, Argus, has successfully performed laser implosion experiments at power levels exceeding 2 TW. D-T filled glass microspheres have been imploded to yield thermonuclear reaction products in excess of 5 x 108 per event. Neutron and .cap alpha. time-of-flight measurements indicate that D-T ion temperatures of approximately 5 to 6 keV and a density confinement time product (n tau) of approximately 1 x 1012 were obtained in these experiments. Typically two 40J, 40 psec pulses of 1.06 .mu.m light were focused on targets using 20 cm aperture f/l lenses, producing intensities at the target in excess of 1016 W/cm2. An extensive array of diagnostics routinely monitored the laser performance and the laser target interaction process. Measurements of absorption and asymmetry in both the scattered light distribution and the ion blow off is evidence for non-classical absorption mechanisms and density scale heights of the order of 2 .mu.m or less. The symmetry of the thermonuclear burn region is investigated by monitoring the .cap alpha.-particle flux in several directions, and an experiment to image the thermonuclear burn region is in process. These experiments significantly extend our data base and our understanding of laser induced thermonuclear implosions and the basic laser plasma interaction physics from the 0.4 to 0.7 TW level of previous experiments.
Download or read book Production of High Contrast Ultrashort Laser Pulses for Short Scale Plasma Experiments written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1976 with total page 1292 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1994-05 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1975-11 with total page 960 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Interaction of Plasmas with Intense Lasers written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The interaction of plasmas with intense lasers is an excellent example of how different fields of physics are inter-connected. Invention of the laser and its ongoing development has allowed the creation and study of high temperature, dense matter in the laboratory. The results both advance the underlying plasma science and are relevant to many fields ranging from astrophysics to fusion and nonlinear physics. A brief overview of the interaction physics is given. Selected topics are discussed to illustrate the exciting progress in experimental, theoretical and computational investigations with focused laser intensities up to 1021 W/cm2.
Download or read book Theory of the Coronal Plasma in Laser Fusion Targets written by C. E. Max and published by . This book was released on 1981 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Annual Index written by and published by . This book was released on 1975 with total page 882 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fusion Energy Update written by and published by . This book was released on 1983 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optical scattering Measurements from 1 06 Mu M 0 53 Mu M and 0 35 Mu M Laser heated Disk Targets written by and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A discussion is presented on scattered light measurements relevant to three of the important parametric instabilities which occur in high intensity laser plasma interactions: stimulated Brillouin scattering (SBS), the two plasmon decay instability (2-.omega./sub pe/), and stimulated Raman scattering (SRS). Most of these experiments were carried out on the ARGUS facility. Its configuration is described for the multiple wavelength experiments, all of which were conducted with one beam illumination of flat disk targets.
