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in creator/contributor: "Davis, J.L."  
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Solid State Power Amplifier for 805 MegaHertz at the Los Alamos Neutron Science Center

Description: Particle accelerators for protons, electrons, and other ion species often use high-power vacuum tubes for RF amplification, due to the high RF power requirements to accelerate these particles with high beam currents. The final power amplifier stages driving large accelerators are unable to be converted to solid-state devices with the present technology. In some instances, radiation levels preclude the use of transistors near beamlines. Work is being done worldwide to replace the RF power stages… more
Date: October 19, 1998
Creator: Davis, J.L. & Lyles, J.T.M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Code system to compute radiation dose in human phantoms

Description: Monte Carlo photon transport code and a code using Monte Carlo integration of a point kernel have been revised to incorporate human phantom models for an adult female, juveniles of various ages, and a pregnant female at the end of the first trimester of pregnancy, in addition to the adult male used earlier. An analysis code has been developed for deriving recommended values of specific absorbed fractions of photon energy. The computer code system and calculational method are described, emphasiz… more
Date: January 1, 1986
Creator: Ryman, J. C.; Cristy, M.; Eckerman, K. F.; Davis, J. L.; Tang, J. S. & Kerr, G. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Multi-Kilovolt X-Ray Conversion Efficiencies

Description: X-ray sources in the 3-7 keV energy regime can be produced by laser-irradiating mid- and high-Z gas-filled targets with high-powered lasers. A series of experiments have been performed using underdense targets that are supersonically heated with {approx} 35 kJ of 0.35 {micro}m laser light. These targets were cylindrical Be enclosures that were filled with 1-2 atms of Xe or Ar gas. L-shell x-ray emission is emitted from the plasma and detected by Bragg crystal spectrometers and x-ray diodes. Abs… more
Date: August 23, 2001
Creator: Back, C. A.; Davis, J. L.; Grun, J.; Landen, O. L.; Miller, M. C. & Suter, L. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Production of Multi-Kilovolt X-Ray From Laser-Heated Targets

Description: Experiments to develop high photon energy x-ray sources were carried out on the Nova laser. Ten laser beams delivered approximately 39 kJ of energy in 2 ns into a Be cylinder filled with Xe gas. The conversion efficiency into x-ray {lt} 4 keV was measured to be 5-15%, which is the highest measured in this photon regime for laser-produced plasmas. The temporal dependence of the x-ray emission indicates that the bulk of the emission is emitted in the first half of the 2 ns pulse. A set of diagnos… more
Date: July 1, 1997
Creator: Back, C. A.; Grum, J.; Decker, C. D.; Davis, J. L.; Landen, O. L.; Suter, L. J. et al.
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Partner: UNT Libraries Government Documents Department
open access

Mathematical models and specific absorbed fractions of photon energy in the nonpregnant adult female and at the end of each trimester of pregnancy

Description: Mathematical phantoms representing the adult female at three, six, and nine months of gestation are described. They are modifications of the 15-year-old male/adult female phantom (15-AF phantom) of Cristy and Eckerman (1987). The model of uterine contents includes the fetus, fetal skeleton, and placenta. The model is suitable for dose calculations for the fetus as a whole; individual organs within the fetus (other than the skeleton) are not modeled. A new model for the nonpregnant adult female … more
Date: May 8, 1995
Creator: Stabin, M. G.; Watson, E. E.; Cristy, M.; Ryman, J. C.; Eckerman, K. F.; Davis, J. L. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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