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Soft x-ray laser gain prediction at high density for the nitrogen isoelectronic sequence

Description: In model calculation, population inversions for 2s{sup 2}2p{sup 2}3s-2s{sup 2}2p{sup 2}3p and for 2s{sup 2}2p{sup 2}d3p-2s{sup 2}2p{sup 2}3d are predicted for ions of the N-like isoelectronic sequence (Kr{sup 29+}, Zr{sup 33+}, Mo{sup 35+}, Pd{sup 39+}, Sn{sup 43+} and Xe{sup 47+}), at electron densities higher than 10{sup 22} cm{sup {minus}3}. Maximum gains of 46 cm{sup {minus}1} for Kr{sup 29+} at 245{angstrom}, and 231 cm{sup {minus}1} at 126{angstrom} for Xe{sup 47+} are obtained. The elect… more
Date: January 11, 1991
Creator: Klapisch, M. (Lawrence Berkeley Lab., CA (USA)); Cohen, M.; Goldstein, W.H. (Lawrence Livermore National Lab., CA (USA)) & Feldman, U. (Naval Research Lab., Washington, DC (USA). E.O. Hulburt Center for Space Research)
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Partner: UNT Libraries Government Documents Department
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Amplification of surface temperature trends and variability in thetropical atmosphere

Description: The month-to-month variability of tropical temperatures is larger in the troposphere than at the Earth's surface. This amplification behavior is similar in a range of observations and climate model simulations, and is consistent with basic theory. On multi-decadal timescales, tropospheric amplification of surface warming is a robust feature of model simulations, but occurs in only one observational dataset. Other observations show weak or even negative amplification. These results suggest that … more
Date: August 11, 2005
Creator: Santer, B. D.; Wigley, T. M. L.; Mears, C.; Wentz, F. J.; Klein, S. A.; Seidel, D. J. et al.
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Partner: UNT Libraries Government Documents Department
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An Analysis of Shot Noise Propagation and Amplificationin Harmonic Cascade FELs

Description: The harmonic generation process in a harmonic cascade (HC) FEL is subject to noise degradation which is proportional to the square of the total harmonic order. In this paper, we study the shot noise evolution in the first-stage modulator and radiator of a HC FEL that produces the dominant noise contributions. We derive the effective input noise for a modulator operating in the low-gain regime, and analyze the radiator noise for a density-modulated beam. The significance of these noise sources i… more
Date: December 11, 2006
Creator: Huang, Z.
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Partner: UNT Libraries Government Documents Department
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Technique for the Generation of Attosecond X-Ray Pulses Using anFEL

Description: We describe a technique for the generation of an isolated burst of X-ray radiation with a duration of {approx} 100 attoseconds in a free electron laser (FEL) employing self-amplified spontaneous emission. Our scheme relies on an initial interaction of the electron beam with an ultra-short laser pulse in a one-period wiggler followed by compression in a dispersive section. The result of this interaction is to create a sub-femtosecond slice of the electron beam with enhanced growth rates for FEL … more
Date: May 11, 2005
Creator: Penn, G. & Zholents, A.A.
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Partner: UNT Libraries Government Documents Department
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Quality Control, Testing, and Deployment Results in the NIF ICCS

Description: The strategy used to develop the NIF Integrated Computer Control System (ICCS) calls for incremental cycles of construction and formal test to deliver a total of 1 million lines of code. Each incremental release takes four to six months to implement specific functionality and culminates when offline tests conducted in the ICCS Integration and Test Facility verify functional, performance, and interface requirements. Tests are then repeated on line to confirm integrated operation in dedicated las… more
Date: October 11, 2001
Creator: Woodruff, J P; Casavant, D; Cline, B D & Gorvad, M R
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Partner: UNT Libraries Government Documents Department
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High Repetition Rate Grazing Incidence Pumped X-ray Laser operating at 18.9 nm

Description: We have demonstrated a 10 Hz Ni-like Mo X-ray laser operating at 18.9 nm with 150 mJ total pump energy by employing a novel pumping scheme. The grazing incidence scheme is described, where a picosecond pulse is incident at a grazing angle to a Mo plasma column produced by a slab target irradiated by a 200 ps laser pulse. This scheme uses refraction of the short pulse at a pre-determined electron density to increase absorption to pump a specific gain region. The high efficiency inherent to this … more
Date: May 11, 2004
Creator: Keenan, R.; Dunn, J.; Patel, P. K.; Price, D. F.; Smith, R. F. & Shlyaptsev, V. N.
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Partner: UNT Libraries Government Documents Department
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Route to High Temperatures by Current Amplification in the Sustained Spheromak Physics Experiment (SSPX)

Description: For the spheromak to be attractive as a reactor concept it would be necessary to sustain the configuration with a low recycling power, reflected in the current amplification factor: A{sub 1} = I{sub tor}/I{sub gun}, where I{sub tor} is the toroidal current and I{sub gun} is the gun current. It is understood that A{sub 1} needs to be around 60 for a reactor [1], although the highest obtained so far in the spheromak has been {approx}3 [2]. The spheromak is a simply connected toroidal confinement … more
Date: June 11, 2002
Creator: Woodruff, S.; Holbomb, C. T.; Stallard, B. W.; Hill, D. N.; Hooper, E. B.; McLean, H. S. et al.
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Partner: UNT Libraries Government Documents Department
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Amplification of Pressure Waves during Vibrational Equilibration of Excited Chemical Reaction Products

Description: The Non-Equilibrium Zeldovich - von Neumann - Doring (NEZND) theory of self-sustaining detonation identified amplification of pressure wavelets during equilibration of vibrationally excited reaction products in the reaction zone as the physical mechanism by which exothermic chemical energy release sustains detonation waves. This mechanism leads to the formation of the well-known, complex three-dimensional structure of a self-sustaining detonation wave. This amplification mechanism is postulated… more
Date: May 11, 2004
Creator: Tarver, C M
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Partner: UNT Libraries Government Documents Department
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Laser induced damage in multilayer dielectric gratings due to ultrashort laser pulses. Revision 1

Description: Chirped pulse amplification is increasingly used to produce intense ultrashort laser pulses. When high-efficiency gratings are the dispersive element, as in the LLNL Petawatt laser, their susceptibility to laser induced damage constitutes a limitation on the peak intensities that can be reached. To obtain robust gratings, it is necessary to understand the causes of short-pulse damage, and to recognize the range of design options for high efficiency gratings. Metal gratings owe their high effici… more
Date: July 11, 1995
Creator: Shore, B. W.; Stuart, B. C.; Feit, M. D.; Rubenchik, A. M. & Perry, M. D.
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Partner: UNT Libraries Government Documents Department
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Energy confinement and magnetic field generation in the SSPX spheromak

Description: The Sustained Spheromak Physics Experiment (SSPX) [E.B. Hooper, et. al., Nuclear Fusion, Vol. 39, No. 7] explores the physics of efficient magnetic field buildup and energy confinement, both essential parts of advancing the spheromak concept. Extending the spheromak formation phase increases the efficiency of magnetic field generation with the maximum edge magnetic field for a given injector current (B/I) from 0.65 T/MA previously to 0.9 T/MA. We have achieved the highest electron temperatures … more
Date: February 11, 2008
Creator: Hudson, B.; McLean, H. S.; Wood, R. D.; Hooper, E. B.; Hill, D. N.; Jayakumar, J. et al.
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Partner: UNT Libraries Government Documents Department
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