The Use of Ultraviolet Thomson Scattering as a Versatile Diagnostic for Detailed Measurements of a Collisional Laser Produced Plasma PDF Download
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Author: Mark David Tracy
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Languages : en
Pages : 470
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Author: Mark David Tracy
Publisher:
ISBN:
Category :
Languages : en
Pages : 470
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Author:
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Languages : en
Pages :
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Collective Thomson scattering from ion-acoustic waves at 266nm is used to obtain spatially resolved, two-dimensional electron density, sound speed, and radial drift profiles of a collisional laser plasma. An ultraviolet diagnostic wavelength minimizes the complicating effects of inverse bremsstrahlung and refractive turning in the coronal region of interest, where the electron densities approach n[sub c]/10. Laser plasmas of this type are important because they model some of the aspects of the plasmas found in high-gain laser-fusion pellets irradiated by long pulse widths where the laser light is absorbed mostly in the corona. The experimental results and LASNEX simulations agree within a percent standard deviation of 40% for the electron density and 50% for the sound speed and radial drift velocity. Thus it is shown that the hydrodynamics equations with classical coefficients and the numerical approximations in LASNEX are valid models of laser-heated, highly collisional plasmas. The versatility of Thomson scattering is expanded upon by extending existing theory with a Fokker-Planck based model to include plasmas that are characterized by (0 [le] k[sub ia][lambda][sub ii] [le] [infinity]) and ZT[sub e]/T[sub i], where k[sub ia] is the ion- acoustic wave number, [lambda][sub ii] is the ion-ion mean free path, Z is the ionization state of the plasma, and T[sub e], T[sub i] are the electron and ion temperatures in electron volts respectively. The model is valid for plasmas in which the electrons are approximately collisionless, (k[sub ia][lambda][sub ei], k[sub ia][lambda][sub ee] [ge] 1), and quasineutrality holds, ([alpha] [much-gt]1), where [alpha] = 1/k[lambda][sub DE] and [lambda][sub DE] is the electron Debye length. This newly developed model predicts the lineshape of the ion-acoustic Thomson spectra and when fit to experimental data provides a direct measurement of the relative thermal flow velocity between the electrons and ions.
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Category : Power resources
Languages : en
Pages : 544
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Category : Dissertations, Academic
Languages : en
Pages : 752
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Category : Government reports announcements & index
Languages : en
Pages : 1368
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Category : Nuclear energy
Languages : en
Pages : 978
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Category : Controlled fusion
Languages : en
Pages : 364
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Category : Science
Languages : en
Pages : 580
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Author: Wonchul Lee
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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 (
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Languages : en
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This Thomson scattering diagnostic system is used to measure the electron temperature and density of the east mirror plug of the Tandem Mirror Experiment (TMX) at Lawrence Livermore Laboratory. The measurements are made by firing a high-power ruby laser pulse through the plasma where the electrons then re-radiate a small fraction of the light. Because of the velocity of the electrons, the wavelength of the re-radiated light is Doppler shifted. The width of the Doppler-shifted wavelength spectrum is a measure of the temperature of the electrons in the plasma, and the total amount of re-radiated light is proportional to the electron density.
