Zobrazeno 1 - 10
of 35
pro vyhledávání: '"R. S. Walling"'
Autor:
Bruce A. Faddegon, R. S. Walling, D. Garrett, C. L. Hartmann Siantar, D K Knapp, R. K. House, Alex F. Bielajew, Paul M. Bergstrom, T. P. Daly, D. J. Wieczorek, Lynn J. Verhey, N. Albright, Cynthia H. Chuang
Publikováno v:
Medical Physics. 28:1322-1337
PEREGRINE is a three-dimensional Monte Carlo dose calculation system written specifically for radiotherapy. This paper describes the implementation and overall dosimetric accuracy of PEREGRINE physics algorithms, beam model, and beam commissioning pr
Autor:
B. K. F. Young, Al Osterheld, Richard E. Stewart, Dwight Price, Takako Kato, Richard M. More, Ronnie Shepherd, R. S. Walling
Publikováno v:
Journal of Quantitative Spectroscopy and Radiative Transfer. 58:911-916
We have conducted experiments to determine the effects of target thickness on the time history and spectra from short pulse laser produced plasmas. A reduced contribution to conduction cooling was achieved by using thin targets. The experiment was do
Autor:
David M. Villeneuve, Alan S. Wan, Gary D. Enright, J. C. Kieffer, Olivier Peyrusse, Marc Nantel, J. Dunn, R. S. Walling, H. A. Scott, Albert L. Osterheld
Publikováno v:
Journal of Physics B: Atomic, Molecular and Optical Physics. 28:2765-2780
Time- and two-dimensional spatially-resolved monochromatic imaging is performed on Ne-like germanium laser-produced line plasmas to study the behaviour of the inhomogeneities along the line created by a nonuniform irradiation. The imaging is done at
Autor:
R. S. Walling, Ronnie Shepherd, Richard E. Stewart, Dwight Price, Richard M. More, Gary Guethlein, William E. White
Publikováno v:
Physical Review Letters. 75:252-255
We report measurements of laser absorption for high-contrast ultrashort pulses on a variety of solid targets over an intensity range of ${10}^{13}$ to ${10}^{18}$ W/ ${\mathrm{cm}}^{2}$. These data give an experimental determination of the target ene
Autor:
William H. Goldstein, S. Gordan, Richard E. Stewart, R. S. Walling, William E. White, Dwight Price, Ronnie Shepherd, Al Osterheld
Publikováno v:
Journal of Quantitative Spectroscopy and Radiative Transfer. 51:357-360
The K -shell emission from porous aluminum targets is used to infer the density and temperature of plasmas created with 800 and 400 nm, 140 fsec laser light. The laser beam is focused to a minimum spot size of 5 μm with 800 nm light and 3 μm with 4
Autor:
A. L. Osterheld, R. S. Walling, Richard E. Stewart, B. K. F. Young, R. L. Shepherd, William H. Goldstein, G. Shimkaveg
Publikováno v:
Journal of Quantitative Spectroscopy and Radiative Transfer. 51:417-423
We present results of recent experiments to measure the plasma conditions present in a neon-like x-ray laser plasma. We measure the time-resolved K -shell emission spectra of low Z tracer material doped into a yttrium exploding foil target. We determ
Autor:
Dennis L Matthews, Richard E. Stewart, B. K. F. Young, L. B. Da Silva, William H. Goldstein, G. Shimkaveg, R. A. London, Albert L. Osterheld, B. J. MacGowan, R. S. Walling
Publikováno v:
Journal of Quantitative Spectroscopy and Radiative Transfer. 51:263-271
We have developed compact collisional-radiative models to describe the ionization balance and excitation mechanisms in neon-like selenium x-ray laser plasmas. These models can be used for calculations of the ionization dynamics, detailed emission spe
Autor:
G. Shimkaveg, D. J. Fields, Mordecai D. Rosen, Dennis L Matthews, B. J. MacGowan, R. S. Walling, Albert L. Osterheld, William H. Goldstein, James H. Scofield, Richard E. Stewart, L. B. Da Silva, T. W. Phillips
Publikováno v:
Physical Review A. 46:1606-1609
We report the observation of high-gain lasing in laser-heated exploding-foil Ag targets at pump irradiances \ensuremath{\ge}6\ifmmode\times\else\texttimes\fi{}${10}^{14}$ W/${\mathrm{cm}}^{2}$. The measured gain coefficients on the dominant Ne-like J
Autor:
B. J. MacGowan, G. Shimkaveg, R. S. Walling, L. B. Da Silva, James E. Trebes, D. J. Fields, Dennis L Matthews, Christopher J. Keane, S. Maxon, Albert L. Osterheld, James H. Scofield, Jeffrey A. Koch, Stanley Mrowka, Richard A. London
Publikováno v:
Physics of Fluids B: Plasma Physics. 4:2326-2337
Laboratory x‐ray lasers are currently being studied by researchers worldwide. This paper reviews some of the recent work carried out at Lawrence Livermore National Laboratory. Laser action has been demonstrated at wavelengths as short as 35.6 A whi
Publikováno v:
Applications of High Field and Short Wavelength Sources VII.
Experimental short pulse lasers are rapidly approaching energy levels where target irradiances exceeding 1020 W/cm2 are routinely achievable [1,2,3]. These high intensity levels will open up a new class of solid target interaction physics where relat