Author: Roy Alexander Tinguely
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Category :
Languages : en
Pages : 258
Book Description
In the Alcator C-Mod tokamak, a magnetic confinement fusion experiment, electrons are accelerated to relativistic energies -- on the order of tens of MeV -- during steady-state conditions of Ohmic, elongated, and diverted plasma discharges. These so-called "runaway" electrons emit synchrotron radiation in their direction of motion due to their gyration in the background toroidal magnetic field, with values of B0 ranging from 2.7 to 7.8 T at the plasma axis. Two spectrometers, a wide-view camera, and a polarimeter are used to measure time-evolving spectra, images, and polarization information, respectively, of the synchrotron radiation in the visible/near-infrared wavelength range, [lambda] ~~ 300-1000 nm. The kinetic equation solver Code [Landreman et al 2014 Comput. Phys. Commun., Stahl et al 2016 Nucl. Fusion] and synthetic diagnostic Soft [Hoppe et al 2018 Nucl. Fusion] are used to model the evolution of the runaway electron phase space distribution and to simulate the detected synchrotron emission, respectively. The major contributions of this thesis work to the fields of plasma physics and fusion energy research are the following: Spectral measurements are consistent with runaway electrons' attaining lower energies as the magnetic field increases, a positive sign for future high-field fusion devices. The runaway electron density profile and other spatiotemporal dynamics, such as increased radial transport due to magnetohydrodynamic activity, are inferred from the two-dimensional synchrotron intensity distributions captured in camera images. Finally, for the first time in a tokamak plasma experiment, polarized synchrotron light is used as a novel diagnostic of the pitch angle distribution of runaway electrons. For all three measurements, discrepancies between experiment and theory/simulation are identified, and opportunities for future work are presented.
An Analysis of Synchrotron Radiation from Relativistic Electrons in the Alcator C-Mod Tokamak
Electron Velocity Distributions by Electron Cyclotron Emission in the Alcator C Tokamak, Diagnosis of Mildly Relativistic
Author: Ian H. Hutchinson
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Category :
Languages : en
Pages : 60
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 60
Book Description
Particle Transport on the Alcator C-Mod Tokamak
Author: Cindy R. Christensen
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Category :
Languages : en
Pages : 184
Book Description
Publisher:
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Category :
Languages : en
Pages : 184
Book Description
Information Content of Transient Synchrotron Radiation in Tokamak Plasmas
Author:
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Languages : en
Pages :
Book Description
A brief, deliberate, perturbation of hot tokamak electrons produces a transient, synchrotron radiation signal, in frequency-time space, with impressive informative potential on plasma parameters; for example, the dc toroidal electric field, not available by other means, may be measurably. Very fast algorithms have been developed, making tractable a statistical analysis that compares essentially all parameter sets that might possibly explain the transient signal. By simulating data numerically, we can estimate the informative worth of data prior to obtaining it. 20 refs., 2 figs.
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
A brief, deliberate, perturbation of hot tokamak electrons produces a transient, synchrotron radiation signal, in frequency-time space, with impressive informative potential on plasma parameters; for example, the dc toroidal electric field, not available by other means, may be measurably. Very fast algorithms have been developed, making tractable a statistical analysis that compares essentially all parameter sets that might possibly explain the transient signal. By simulating data numerically, we can estimate the informative worth of data prior to obtaining it. 20 refs., 2 figs.
Beam Emission Spectroscopy on the Alcator C-Mod Tokamak
Author: Matthew Brian Sampsell
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Category : Plasma turbulence
Languages : en
Pages :
Book Description
Publisher:
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Category : Plasma turbulence
Languages : en
Pages :
Book Description
The Submillimeter Wave Electron Cyclotron Emission Diagnostic for the Alcator C-Mod Tokamak
Author: Thomas C. Hsu
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Category :
Languages : en
Pages : 202
Book Description
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Category :
Languages : en
Pages : 202
Book Description
Doppler Measurements in the Edge of the Alcator C-Mod Tokamak Using a High-resolution Visible Spectrometer
Author: Alexander Turner Graf
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Category :
Languages : en
Pages : 390
Book Description
Publisher:
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Category :
Languages : en
Pages : 390
Book Description
Electron Heating Via Mode Converted Ion Bernstein Waves in the Alcator C-mod Tokamak
Author: Paul Bonoli
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Category :
Languages : en
Pages : 42
Book Description
Publisher:
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Category :
Languages : en
Pages : 42
Book Description
Information Content of Transient Synchrotron Radiation in Tokamak Plasmas
Author: N. J. Fisch
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Category :
Languages : en
Pages : 8
Book Description
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Category :
Languages : en
Pages : 8
Book Description
Measurement and Analysis of Highly-resolved Spectra from Low-Z Ions in the Alcator C-mod Tokamak
Author: James Lawrence Weaver
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Category : Plasma confinement
Languages : en
Pages : 274
Book Description
Publisher:
ISBN:
Category : Plasma confinement
Languages : en
Pages : 274
Book Description