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in subjects: "Amplification"  
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Stabilized Spheromak Fusion Reactors

Description: The U.S. fusion energy program is focused on research with the potential for studying plasmas at thermonuclear temperatures, currently epitomized by the tokamak-based International Thermonuclear Experimental Reactor (ITER) but also continuing exploratory work on other plasma confinement concepts. Among the latter is the spheromak pursued on the SSPX facility at LLNL. Experiments in SSPX using electrostatic current drive by coaxial guns have now demonstrated stable spheromaks with good heat conf… more
Date: April 3, 2007
Creator: Fowler, T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Pulse duration measurements of a picosecond laser-pumped 14.7 nm x-ray laser

Description: The temporal dependence of the 14.7 nm Ni-like Pd ion x-ray laser is measured as a function of the laser drive conditions with a fast sub-picosecond x-ray streak camera. The chirped pulse amplification laser beam that pumps the inversion process is varied from 0.5 - 27 ps (FWHM) to determine the effect on the x-ray laser pulse duration. The average x-ray laser pulse duration varies by a relatively small factor of 2.5 times from 3.6 ps to 8.1 ps with traveling wave (TW) irradiation conditions. S… more
Date: August 3, 2004
Creator: Dunn, J; Smith, R F; Shepherd, R; Booth, R; Nilsen, J; Hunter, J R et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Grazing Incidence Pumping for High Efficiency X-ray Lasers

Description: Over the last decade, most laser-driven collisional excitation x-ray lasers have relied on the absorption of the pump energy incident at normal incidence to a pre-formed plasma. The main advantage is that the inversion can be created at various plasma regions in space and time where the amplification and ray propagation processes are best served. The main disadvantage is that different plasma regions regardless of the contribution to the inversion have to be pumped simultaneously in order to ma… more
Date: October 3, 2005
Creator: Dunn, J; Keenan, R & Shlyaptsev, V N
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Comparative analyses of gene copy number and mRNA expression in GBM tumors and GBM xenografts

Description: Development of model systems that recapitulate the molecular heterogeneity observed among glioblastoma multiforme (GBM) tumors will expedite the testing of targeted molecular therapeutic strategies for GBM treatment. In this study, we profiled DNA copy number and mRNA expression in 21 independent GBM tumor lines maintained as subcutaneous xenografts (GBMX), and compared GBMX molecular signatures to those observed in GBM clinical specimens derived from the Cancer Genome Atlas (TCGA). The predomi… more
Date: April 3, 2009
Creator: Hodgson, J. Graeme; Yeh, Ru-Fang; Ray, Amrita; Wang, Nicholas J.; Smirnov, Ivan; Yu, Mamie et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Robust autoresonant excitation in the plasma beat-waveaccelerator: A theoretical study

Description: A modified version of the Plasma Beat-Wave Accelerator scheme is introduced and analyzed, which is based on autoresonant phase-locking of the nonlinear Langmuir wave to the slowly chirped beat frequency of the driving lasers via adiabatic passage through resonance. This new scheme is designed to overcome some of the well-known limitations of previous approaches, namely relativistic detuning and nonlinear modulation or other non-uniformity or non-stationarity in the driven Langmuir wave amplitud… more
Date: November 3, 2004
Creator: Lindberg, R.R.; Charman, A.E. & Wurtele, J.S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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