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Efficient forward conversion in a Raman generator

Description: Stimulated Raman scattering of an XeCl laser at 308 nm in a high pressure H/sub 2/ cell shows anomalously high conversion into first Stokes (S1) when a pumping geometry with a Fresnel number near unity is used. Specifically a quantum efficiency of 88% is obtained into S1. Comparison with a plane-wave model indicates that a theory including diffraction and 4-wave mixing may be necessary to understand the anomalous holdoff of the second Stokes component. 10 references.
Date: January 1, 1984
Creator: Carlsten, J.L.; Telle, J.M. & Wenzel, R.G.
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Partner: UNT Libraries Government Documents Department
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Laser program annual report 1983

Description: In the 1983 Laser Program Annual Report we present the accomplishments and unclassified activities of the Laser Program at Lawrence Livermore National laboratory (LLNL) for the year 1983. It should be noted that the report, of necessity, is a summary, and more detailed expositions of the research can be found in the many publications and reports authored by staff members in the Laser Program. The purpose of this report is to present our work in a brief form, but with sufficient depth to provide… more
Date: June 1, 1984
Creator: Hendricks, C.D.; Rufer, M.L. & Murphy, P.W. (eds.)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Summary of the working group on FEL theory

Description: The working group on FEL theory dedicated most of its discussions to topics relevant to the high gain regime in a free electron laser. In addition the area of interest was mainly restricted to FELs for the production of XUV radiation (<1000 A). A list of the topics that were felt to be relevant is: (1) characterization of the FEL high gain regime; (2) the amplified spontaneous emission mode of operation (ASE); (3) superradiance in FELs; (4) diffraction effects for high gain FELs; (5) noise and … more
Date: January 1, 1984
Creator: Pellegrini, C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Recent Livermore estimates on the energy gain of cryogenic single-shell ion beam targets

Description: Our recent estimates are that the energy-gain for cryogenic single-shell targets are close to those of similar double-shelled targets. However, the peak-power requirements for single-shell targets are still about a factor of two higher.
Date: January 1, 1984
Creator: Lindl, J.D. & Mark, J.W.K.
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Partner: UNT Libraries Government Documents Department
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Soft x-ray laser experiments at Novette Laser Facility

Description: We discuss the results of and future plans for experiments to study the possibility of producing an x-ray laser. The schemes we have investigated are all pumped by the Novette Laser, operated at short pulse (tau/sub L/ approx. 100 psec) and an incident wavelength of lambda /sub L/ approx. 0.53 ..mu..m. We have studied the possibility of lasing at 53.6, 68.0 to 72.0, 119.0, and 153.0 eV, using the inversion methods of resonant photo-excitation, collisional excitation, and three-body recombinatio… more
Date: March 5, 1984
Creator: Matthews, D.; Hagelstein, P.; Rosen, M.; Kauffman, R.; Lee, R.; Wang, C. et al.
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Partner: UNT Libraries Government Documents Department
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New method of proportional counter feedback biasing for wide-range radiation dose-rate monitors

Description: A prototypic wide-range radiation dose-rate monitor for civil defense applications has been developed and tested. The specified dose-rate range (0 to 500 R/h) was displayed on a single readout scale by using feedback-controlled biasing of a proportional counter. This new method is based on controlling the avalanche multiplication factor (gas gain) of the counter by varying its bias voltage in response to its measured output current (i.e., detected dose rate). The counter output current varies b… more
Date: January 1, 1984
Creator: Kopp, M.K.; Valentine, K.H.; Guerrant, G.C. & Manning, F.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Progress in Inertial Confinement Fusion at Lawrence Livermore National Laboratory

Description: The goals of the Inertial Fusion Program at the Lawrence Livermore National Laboratory are to study matter under extreme conditions of temperature and pressure and to produce fusion energy from inertially confined fusion fuel. With the conclusion of recent multi-kilojoule 0.53 ..mu..m experiments on Novette, we have demonstrated vastly improved plasma conditions compared to those previously obtained at LLNL with similar energies at 1.06 ..mu..m and elsewhere with 10 ..mu..m radiation. The lower… more
Date: August 6, 1984
Creator: Holzrichter, John F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Heavy ion inertial fusion: interface between target gain, accelerator phase space and reactor beam transport revisited

Description: Recently revised estimates of target gain have added additional optimistic inputs to the interface between targets, accelerators and fusion chamber beam transport. But it remains valid that neutralization of the beams in the fusion chamber is useful if ion charge state Z > 1 or if > 1 kA per beamlet is to be propagated. Some engineering and economic considerations favor higher currents.
Date: February 22, 1984
Creator: Barletta, W. A.; Fawley, W. M.; Judd, D. L.; Mark, J. W. K. & Yu, S. S.
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Partner: UNT Libraries Government Documents Department
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Economic aspects of heavy ion fusion

Description: The usual parameter space for examining scenarios for heavy ion fusion power plants has generally been based on large, slow cycling, reactor chambers which are only marginally different from chambers proposed for laser drivers. This paper will examine the economic implications of assuming that an inexpensive, low gain pellet is available and that a suitable high-repetition rate reactor has been devised. Interesting scenarios are found that generate economically feasible power from a system with… more
Date: January 1, 1984
Creator: Herrmannsfeldt, W.B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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XUV/VUV free-electron laser oscillator

Description: It is shown, from computations based on a detailed theoretical model, that modest improvements in electron beam and optical mirror technologies will enable a free-electron laser, driven by an rf linear accelerator, to operate in the 50 to 200-nm range of optical wavelengths. 10 references.
Date: April 1, 1984
Creator: Goldstein, J. C.; Newnam, B. E.; Cooper, R. K. & Comly Jr., J. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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New preamplifier for particle detectors

Description: A new preamplifier for particle detectors has been designed and built for the Fermilab VTPC by Fujitsu of Japan. The device, designated MB43458, is a semi-custom monolithic assembled in a small, low mass package. The purpose of this report is to document the preliminary tests which have been done thus far. Tests are continuing to expand upon the results presented herein.
Date: November 1, 1984
Creator: Yarema, R. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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