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  • SPACECRAFT PROPULSION AND POWER  (4)
  • Atomic and molecular processes in external fields, including interactions with strong fields and short pulses  (1)
  • 1
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    Active tailoring of nanoantenna plasmonic fields using few-cycle laser pulses (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-02-26
    Description: Author(s): S. Choi, M. F. Ciappina, J. A. Pérez-Hernández, A. S. Landsman, Y.-J. Kim, S. C. Kim, and D. Kim Plasmonic nanoatennas are a versatile tool for coherently manipulating light on a nanoscale by confining electric fields of the driving laser into subwavelength volumes, thereby significantly enhancing electric near fields. It is normally assumed that the time-dependent spectral properties of these … [Phys. Rev. A 93, 021405(R)] Published Wed Feb 24, 2016
    Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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    PAPER CURRENT
  • 2
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    Numerical study of low-current steady arcs (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The development of a high-efficiency CW YLF laser doped with Er,Tm,Ho: and featuring a strongly focusing resonator that collects a high density of pump power on the active crystal is described. The emission is investigated at 2.06 microns and a tuning range both at liquid-nitrogen (77 K) and at dry-ice (210 K) temperature. The noise characteristics and the long-term power stability of the laser is studied with an eye to employing this source for high-resolution spectroscopy in the 2-micron wavelength region. The detection of several absorption lines of NH3 at low pressure is described. The output power of the laser as a function of the power impinging on the crystal for different transmission of the output mirror is illustrated. The best result obtained is 1.46 W output for 3.2 W of argon pump. The minimum threshold achieved is 3.5 mW with a 1-percent transmission mirror. It is concluded that it is possible to develop a highly efficient Ho:YLF laser featuring low noise and sufficient tunability for high-resolution spectroscopy in the 2-micron region.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: Journal of Propulsion and Power (ISSN 0748-4658); 8; 5, Se; 1012-101
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Numerical study of high-area-ratio H2/O2 rocket nozzles (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Calculations were made for high-area-ratio H2/O2 rocket nozzles by using the RPLUS code which employs an implicit finite volume, lower-upper symmetric successive over-relaxation scheme to solve the Navier-Stokes equations and the species equations in a coupled manner. The combustion processes of hydrogen and oxygen are modeled by an 8-species and 18-step reaction mechanism, and the turbulence is simulated by the Baldwin-Lomax turbulence model with a pressure gradient correction on the van Driest's damping constant in the inner-layer model. The calculated results for two different rocket nozzles are presented as contours, profiles, and performance values. The predicted specific impulse and thrust agree well with the experimental data and those from the industry standard code. It is demonstrated that the RPLUS code can be used for analysis of rocket nozzles.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: AIAA PAPER 91-2434
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Calculations of gaseous H2/O2 thruster (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Calculations were made for the gaseous H2/O2 thruster for the Space Station by using the RPLUS code which employs an implicit finite volume, LUSSOR scheme to solve the Navier-Stokes equations and the species equations. The combustion processes of hydrogen and oxygen are modeled by a 9 species and 18 step reaction mechanism and the turbulence is simulated by the Baldwin-Lomax turbulence model for the thruster wall boundary layer and the modified Prandtl's mixing length model for the reacting shear layer. Results are presented for different mixture ratios and fuel film cooling percents and compared with the experimental data. The calculated performance predictions for the thruster agree well with the experimental data and the results demonstrate that the RPLUS code can be used for design and analysis of thrusters and rockets.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: AIAA PAPER 90-2490
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Performance and flow calculations for a gaseous H2/O2 thruster (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: Journal of Spacecraft and Rockets (ISSN 0022-4650); 28; 433-438
    Format: text
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    NASA TECHNICAL REPORTS
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