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Showing 1 to 20 of 24 for “"Thomson scattering"”.
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Compact laser-driven electron acceleration, bunch compression and coherent nonlinear Thomson scattering
… of coherent hard x-ray radiation by nonlinear Thomson scattering of compressed electron bunches. The Lawson-Woodward theorem describes conditions prohibiting net electron acceleration in laser-electron interactions. We point out how the Lawson-Woodward theorem permits net linear acceleration of …
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Modeling and optimization of a low power 60GHz gyrotron collective Thomson scattering system
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1996.
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Characterization of plasma conductivity by laser Thomson scattering in a high-voltage laser-triggered switch
… and electron temperature measurements via laser Thomson scattering. A HV-LTS testbed utilizing an aqueous (variable impedance) resistive load was designed to produce experimental conditions found in larger pulsed power applications. This work describes the design of the load and experimental …
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Noncollective X-Ray Thomson Scattering Diagnostic Development Based On A Titanium Hybrid X-Pinch X-Ray Source
X-ray Thomson scattering (XRTS) is the combination of elastic Raleigh scattering and inelastic Compton scattering observed from high density systems using energetic probe energies at the keV x-ray level. Thermal x-ray probes have historically been created by delivering 1014 [-] 1016 W/cm2 to a …
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An attampt to measure the electron temperature of a Xenon Chloride excimer laser discharge plasma by Thomson scattering
… of this Xenon Chloride laser using the method of Thomson scattering. The Thomson scattering parameter a was 0.22. A short, 532 nm pulse was injected into the excimer laser and the backscattered light was analysed. The scattered beam was imaged onto the entrance slit of a spectrometer and the …
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Investigation of triggering mechanism of internal transport barriers on the Alcator C-Mod tokamak using Thomson scattering diagnostic
… to ITB studies were made possible with the core Thomson scattering (TS) diagnostic, which measures profiles of electron temperature (0.03 </= Te[keV] </= 10) and density (0.05 </= ne[1020m-3] </= 5) with ~1 cm resolution in the ITB region. For the transport analysis purposes, TS profiles are …
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Solving the system of atomic rate equations during recombination
… motivation was to analyze the effects that Thomson scattering and resonance scattering will have on recombination. However, while working on the project, we found that first we had to thoroughly account for all of the atomic transitions. We present a new method for solving the system of …
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The impact of transient mitigation schemes on the MAST edge plasma
… imaging and high temporal (0.2ms) resolution Thomson scattering. High speed imaging of the plasma shows that the neutral impurities are confined to the plasma periphery. Impurity ions penetrate to the q=2 surface and mix with the bulk plasma during the thermal quench. Thomson scattering data …
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Transport Properties of Divertor Edge Plasmas Measured with Multi-Spectral Imaging
… measurements were validated against co-local Thomson scattering measurements in diverted plasmas. HeMSI showed good agreement with Thomson scattering in the common flux region(CFR) of ionizing plasma for both majority helium and majority deuterium plasmas. Having validated this powerful new …
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High Energy Laser Driven Electron Acceleration
… the generation of multi-MeV γ-rays via nonlinear Thomson scattering. The effects of introducing a gas density gradient just after the accelerating gas cell was tested with the intention of observing an increase in the energy of electrons and an improvement on several other parameters of the beam …
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Edge transport barrier studies on the Alcator C-Mod tokamak
… to ETB studies were made possible with edge Thomson scattering (ETS), which measures profiles of electron temperature (20 Te[eV] 800) and density (0.3 ne[1020m-3] ' 5) with 1.3-mm spatial resolution near the LCFS. Profiles of Te, ne, and Pe = neTe are fitted with a parameterized function, …
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Polarimetry measurements of current density profile and fluctuation changes during lower hybrid experiments on Alcator C-Mod
… has been derived from density profiles from Thomson scattering and magnetic field profiles from EFIT. The polarimeter results confirm that the magnetic field profiles from Kinetic EFIT (with Motional Stark Effect and plasma pressure constraints) is much more accurate than those from normal …
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Edge radial electric field studies via charge exchange recombination spectroscopy on the Alcator C-Mod Tokamak
… profiles are observed to agree well with the Thomson Scattering electron temperature profiles in bothl shape and magnitude over a wide range of collisionalities. In H-mode plasmas both the boron temperature and density profiles form clear pedestals, similar to what is observed in the electron …
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Characterisation of Detached Plasmas on the MAST Tokamak
… probes (6-9mm radial resolution) and upstream Thomson scattering measurements of ne, Te. The data was input into the OSM code, coupled with the kinetic neutral transport code EIRENE, to check the experimental data set for internal consistency. The experimental data collected has been used to …
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Optical characterisation of a low temperature plasma jet
… to be 32.1 kV cm<sup>−1</sup>.<br/><br/>Thomson scattering was also attempted in an effort to obtain electron density and temperature estimates. However, the electron density of the plasma in question was simply too low to detect using the experimental set-up at hand. However, using a …
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Extending the dielectric formalism in warm dense matter: collisions, dynamic structure factors, and stopping powers
… like transport coefficients, stopping powers, scattering and absorption spectra, and many other quantities in the WDM regime. However, competing physical effects, like partial ionization, correlated ion behavior, and quantum degeneracy makes model- ing WDM challenging and often computationally …
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Using fusion-product spectroscopy to diagnose inertial confinement fusion implosions and study stopping power on OMEGA, the NIF, and Z
… challenges at the Z facility due to large scattering sources from the machine and long neutron burn widths. For this reason, a CR-39 based neutron-recoil spectrometer has been developed for measuring the DD spectrum at the Z. A proof of principle design was fielded and the data is …
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Bayesian modelling of nuclear fusion experiments
… uncertainties. Additionally, interferometers, Thomson scattering and spectroscopy systems have been combined, improving the consistency of the inference solutions. These joint inference applications have been developed for JET and W7-X to provide the marginal posterior distribution of the …
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Bayesian analysis of electron cyclotron emission measurements at Wendelstein 7-X
… of density measurements by, for example, the Thomson scattering diagnostic. Finally, the ECE data is used on a simple Bayesian heatwave analysis model in an attempt to obtain the electron heat diffusivity.
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