Development of Raman and Thomson Scattering Diagnostics for Study of Energy Transfer in Nonequilibrium, Molecular Plasmas PDF Download
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Author: Wonchul Lee
Publisher:
ISBN:
Category : Lasers in plasma research
Languages : en
Pages :
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Abstract: Laser light scattering diagnostic techniques, for characterization of weakly ionized molecular plasmas, are developed and demonstrated in high pressure, low temperature air-like molecular plasmas sustained by a continuous wave CO laser. Highly non-Boltzmann vibrational distribution functions (VDFs) of neutral species in the plasmas, which is created by anharmonic vibration-to-vibration up-pumping, are measured by spontaneous Raman scattering. Vibrational levels of all molecular species are significantly overpopulated compared to a Boltzmann distribution, and corresponding vibrational temperatures of molecular species (> 2000 K) are much higher than the translational/rotational temperature (
Author: Wonchul Lee
Publisher:
ISBN:
Category : Lasers in plasma research
Languages : en
Pages :
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Book Description
Abstract: Laser light scattering diagnostic techniques, for characterization of weakly ionized molecular plasmas, are developed and demonstrated in high pressure, low temperature air-like molecular plasmas sustained by a continuous wave CO laser. Highly non-Boltzmann vibrational distribution functions (VDFs) of neutral species in the plasmas, which is created by anharmonic vibration-to-vibration up-pumping, are measured by spontaneous Raman scattering. Vibrational levels of all molecular species are significantly overpopulated compared to a Boltzmann distribution, and corresponding vibrational temperatures of molecular species (> 2000 K) are much higher than the translational/rotational temperature (
Author: K.H. Becker
Publisher: CRC Press
ISBN: 1482269120
Category : Science
Languages : en
Pages : 701
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Book Description
Atmospheric-pressure plasmas continue to attract considerable research interest due to their diverse applications, including high power lasers, opening switches, novel plasma processing applications and sputtering, EM absorbers and reflectors, remediation of gaseous pollutants, excimer lamps, and other noncoherent light sources. Atmospheric-pressu
Author:
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ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 778
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1056
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1142
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Author:
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ISBN:
Category :
Languages : en
Pages : 36
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This report summarizes the work performed under DOE grant DE-FG03-95ER54334. Lodestar was an active participant in the low power Collective Thomson Scattering (CTS) diagnostic experiment at TFTR in collaboration with MIT. A simple and effective fitting technique was developed to extract key parameters from the scattered data. Utilizing this new technique, the concept of lower hybrid resonance scattering was adapted for a feasibility study of a low/medium power collective scattering diagnostic for ITER. The implementation and the testing of such a technique for actual parameter extraction using TFTR data, however, was severely limited due to experimental and instrumentation complications. Based on the studies the authors have performed up to date, it is believed that a combination of non-physics related effects such as multiple wall reflection of incident signal and spectral impurity problem o the gyrotron can account for the anomalous signal strength. A collaborative effort with GA was initiated and a feasibility study of developing and implementing a collective thomson scattering (CTS) diagnostic for the detection of energetic particles at DIII-D was completed. Specifically, the process of selecting an optimum receiver location for the diagnostic is discussed in detailed. Results presented here include detailed signal to noise calculations and ray-tracing studies. Critical physics issues and selection criteria are discussed and a procedure to detect anisotropic energetic ion temperatures is also outlined. Favorable results, obtained in the feasibility study, indicate that it should be possible to develop and implement a CTS diagnostic at DIII-D.
Author: Henrik Bindslev
Publisher:
ISBN: 9788755018747
Category : Plasma (Ionized gases)
Languages : en
Pages : 206
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Author: Ivano Alessandri
Publisher: Frontiers Media SA
ISBN: 2889635538
Category :
Languages : en
Pages : 175
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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The influence of electron trapping on a large-amplitude plasma oscillation driven by the nonlinear interaction of two electromagnetic waves (stimulated Raman scattering) is studied analytically and by means of numerical simulation. When the plasma oscillation is resonantly excited to sufficiently large amplitude and electron trapping occurs, there ensues considerable modification of the electron velocity distribution function. The stimulated scattering ceases to be a resonant three-wave process, but continues as induced scattering by resonant electrons (stimulated Thomson scattering). 5 figures.
Author: Tobias Ruf
Publisher: Springer
ISBN: 9783662147641
Category :
Languages : en
Pages : 264
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