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Thomson Scattering Measurements Of Mast Plasmas
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Book Synopsis Thomson Scattering Measurements of Mast Plasmas by : R. M. Patrick
Download or read book Thomson Scattering Measurements of Mast Plasmas written by R. M. Patrick and published by . This book was released on 1965 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements of Thomson scattering from the plasma electrons were created by high speed shock waves in a magnetic annular shock tube (MAST) used to determine the electron density behind the shock waves, and some preliminary measurements of the electron velocity distribution. A Q-switch ruby laser furnished the light beam which was scattered by the plasma electrons. A rotating quartz prism furnished the Q-switching of the optical cavity for the ruby laser, and rather long Q-switched pulses were obtained (between 10 to the -7th power and 10 to the -6th power sec duration). The power level during the Q-switched pulse was between 30 and 100 megawatts. Rayleigh scattering from an air sample at various pressures was used to calibrate the power output of the laser and gave a simultaneous measure of the laser output power for all of the tests, while the Thomson scattering was being measured. The measurements of the electron density using the Thomson scattering and the plasma continuum intensities agreed within the scatter of the data. The electron temperature measurements obtained with the Thomson scattering showed that the electron temperature increased with increasing shock speed for a given initial condition. (Author).
Book Synopsis Thomson Scattering Measurements of Plasma Dynamics by : S. H. Glenzer
Download or read book Thomson Scattering Measurements of Plasma Dynamics written by S. H. Glenzer and published by . This book was released on 2006 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors propose to investigate the dynamics of plasmas in the warm dense matter (WDM) regime on ultra-short time scales. Accessible plasma conditions are in the density range of n = 10{sup 20} - 10{sup 23} cm{sup -3} and at moderate temperatures of T = 1 - 20 eV. These plasmas are of importance for laboratory astrophysics, high energy density science and inertial confinement fusion. They are characterized by a coupling parameter of {Lambda} {approx}> 1, where electromagnetic interactions are of the same order as the kinetic energy. The high density of the plasma makes it opaque to radiation in the visible range and, as a consequence, UV up to x-ray radiation can be used to probe such systems. Therefore a wide range in the temperature-density plane of WDM is presently unexplored and only the VUV-FEL opens for the first time the opportunity for its detailed investigation. In equilibrium, the macroscopic state of the plasma is completely characterized by its density and temperature. In pump-probe experiments however, the plasma is initially in a nonequilibrium state and relaxes towards equilibrium within the relaxation time {tau}{sub R}. For t> {tau}{sub R}, the plasma is in an equilibrium state and expands hydrodynamically on a time scale {tau}{sub H}. The proposed experiment measures the time-resolved Thomson scattering signal with the VUV-FEL radiation characterizing the plasma in equilibrium and nonequilibrium states. Both regimes are extremely interesting and will provide new insight into the following phenomena: (1) details of nonequilibrium correlations, (2) relaxation phenomena, (3) hydrodynamic expansion, (4) recombination kinetics. The time-resolved Thomson scattering signal is obtained in a pump-probe experiment by varying the delay between pump and probe. The final stage of the relaxation process (t {approx} {tau}{sub R}) is of special interest since the plasma components (electrons and ion species) can be assumed to be in quasi-equilibrium. This allows for accurate measurements of the electron temperature using the detailed balance relation. For times t {approx}{tau}{sub R} the scattering spectrum provides also the plasmon damping in nonequilibrium from which information on the formation and decay of collective excitations at short time scales can be obtained. At large time scales (t {approx} {tau}{sub H}) the hydrodynamic expansion of the plasma sets in. Detailed information on the evolution of the plasma in this regime is available from sophisticated hydrodynamic computer simulations which can be tested with the proposed measurements. With the decreasing plasma density due to the expansion, recombination processes become important and need to be considered as well.
Book Synopsis Thomson Scattering Measurements in Low Temperature Plasmas by : C. E. Thompson
Download or read book Thomson Scattering Measurements in Low Temperature Plasmas written by C. E. Thompson and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Thomson-Scattering Measurements in the Collective and Non-collective Regimes in Laser Produced Plasmas by :
Download or read book Thomson-Scattering Measurements in the Collective and Non-collective Regimes in Laser Produced Plasmas written by and published by . This book was released on 2010 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Thomson Scattering Measurements of the Plasma Parameters in a Hollow-anode with Ferroelectric Plasma Source by : Vladislav Vekselman
Download or read book Thomson Scattering Measurements of the Plasma Parameters in a Hollow-anode with Ferroelectric Plasma Source written by Vladislav Vekselman and published by . This book was released on 2008 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Thomson Scattering Measurements of Temperature and Density in a Low-Density, Laser Driven Magnetized Plasma by :
Download or read book Thomson Scattering Measurements of Temperature and Density in a Low-Density, Laser Driven Magnetized Plasma written by and published by . This book was released on 2011 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Thomson Scattering Measurements on the High Beta Pinch Extrap-T1 by : P. Karlsson
Download or read book Thomson Scattering Measurements on the High Beta Pinch Extrap-T1 written by P. Karlsson and published by . This book was released on 1989 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 994 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Collective Thomson Scattering Measurements of Ion-acoustic Wave Broadening in Moderately Coupled, Moderately Collisional Plasmas by : Thomas Edward Tierney
Download or read book Collective Thomson Scattering Measurements of Ion-acoustic Wave Broadening in Moderately Coupled, Moderately Collisional Plasmas written by Thomas Edward Tierney and published by . This book was released on 2002 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Thomson Scattering Measurements in Low Pressure Inert and Molecular Gas Plasmas by : G. Craig
Download or read book Thomson Scattering Measurements in Low Pressure Inert and Molecular Gas Plasmas written by G. Craig and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Thomson Scattering Measurement of a Collimated Plasma Jet Generated by a High-power Laser System by :
Download or read book Thomson Scattering Measurement of a Collimated Plasma Jet Generated by a High-power Laser System written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Calendar of Oengus written by and published by . This book was released on 1871 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Thomson Scattering Techniques in Laser Produced Plasmas by : J. S. Ross
Download or read book Thomson Scattering Techniques in Laser Produced Plasmas written by J. S. Ross and published by . This book was released on 2006 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thomson scattering has been shown to be a valuable technique for measuring the plasma conditions in laser produced plasmas. Measurement techniques are discussed that use the ion-acoustic frequency measured from the collective Thomson-scattering spectrum to extract the electron temperature, ion temperature, plasma flow, and electron density in a laser produced plasma. In a recent study, they demonstrated a novel Thomson-scattering technique to measure the dispersion of ion-acoustic fluctuations that employing multiple color Thomson-scattering diagnostics. They obtained frequency-resolved Thomson-scattering spectra of the two separate thermal ion-acoustic fluctuations with significantly different wave vectors. This new technique allows a simultaneous time resolved local measurement of electron density and temperature. The plasma fluctuations are shown to become dispersive with increasing electron temperature. Furthermore, a Thomson-scattering technique to measure the electron temperature profile is presented where recent experiments have measured a large electron temperature gradient (Te = 1.4 keV to Te = 3.2 keV over 1.5-mm) along the axis of a 2-mm long hohlraum when heated asymmetrically.
Book Synopsis Thomson Scattering Measurements of Plasma Turbulence Near Quarter-critical Density in a CO2 Laser-heated Gas Target Plasma by : Jack Jerome Schuss
Download or read book Thomson Scattering Measurements of Plasma Turbulence Near Quarter-critical Density in a CO2 Laser-heated Gas Target Plasma written by Jack Jerome Schuss and published by . This book was released on 1978 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High Resolution Edge Thomson Scattering Measurements of the Alcator C-Mod Tokamak by : Jerry Wayne Hughes
Download or read book High Resolution Edge Thomson Scattering Measurements of the Alcator C-Mod Tokamak written by Jerry Wayne Hughes and published by . This book was released on 2000 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Molecular Origin of Background Light in Thomson Scattering Measurements by :
Download or read book Molecular Origin of Background Light in Thomson Scattering Measurements written by and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The plasma background light in Thomson scattering measurements is often far higher than expected for a pure hydrogen plasma. The spectral distribution of light from three plasmas (duration: 1 ms to steady state; electron density: below 1012 to over 1014 cm−3; temperature: below 20 to over 1000 eV) and signal-to-noise and intensity data from the Thomson scattering systems used on them are compared with analytic estimates to show that in two of these plasmas molecular light dominates the spectrum, while in the other, molecular light is present, but bremsstrahlung is usually more intense. Knowledge of the mechanism for background light can aid in designing detection systems for Thomson scattering and provide information on the neutral species composition and effective charge of the plasma.
Book Synopsis Thomson Scattering Measurements on the High Beam Pinch Extrap-T1 by : P. Karlsson
Download or read book Thomson Scattering Measurements on the High Beam Pinch Extrap-T1 written by P. Karlsson and published by . This book was released on 1989 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
