Relativistic Runaway Electrons in Tokamak Plasmas PDF Download
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Author: Roger Jozef Elisabeth Jaspers
Publisher:
ISBN: 9789038604749
Category :
Languages : en
Pages : 158
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Book Description
Author: Roger Jozef Elisabeth Jaspers
Publisher:
ISBN: 9789038604749
Category :
Languages : en
Pages : 158
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Book Description
Author: Ingeborg Entrop
Publisher:
ISBN: 9789038609478
Category :
Languages : en
Pages : 183
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 33
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Book Description
Author: Fredrik Andersson
Publisher:
ISBN: 9789172913615
Category : Nuclear fusion
Languages : en
Pages : 53
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Book Description
Author: Yung Mok
Publisher:
ISBN:
Category : Plasma (Ionized gases)
Languages : en
Pages : 276
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Book Description
Author: Roy Alexander Tinguely
Publisher:
ISBN:
Category :
Languages : en
Pages : 258
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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.
Author: Michael Forster
Publisher:
ISBN:
Category :
Languages : en
Pages : 151
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
A theoretical treatment of heating of tokamak plasmas by relativistic electron beam (RE3) injection is presented. Comparisons with prior work and considerations for both research and reactor sized systems are included. Guiding center orbits for beam electrons in a tokamak are obtained and requirements for significant beam penetration of the plasma are determined. Interaction mechanics of the beam with the plasma are reviewed and ion heating and runaway problems are considered.
Author: R.B. White
Publisher: Elsevier
ISBN: 1483293262
Category : Science
Languages : en
Pages : 374
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Book Description
This is a graduate textbook on tokamak physics, designed to provide a basic introduction to plasma equilibrium, particle orbits, transport, and those ideal and resistive magnetohydrodynamic instabilities which dominate the behavior of a tokamak discharge, and to develop the mathematical methods necessary for their theoretical analysis.
Author: Sundaresan Sridhar
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Tokamaks are the devices currently closest to achieve nuclear fusion power and disruptions are unfavorable events in which the plasma energy is lost in a very short timescale causing damage to tokamak structures. RE beams are one of the consequence of disruptions and they carry the risk of in-vessel component damage. Thus, the prevention and control of the RE are of prime importance. The current strategy for runaway electrons is to avoid their generation by a massive material injection (MMI). If their generation cannot be avoided, a 2nd MMI will be used to mitigate the generated RE beam. After the 1st MMI to prevent RE generation, a background plasma of 1st MMI impurities is formed which make the second MMI inefficient to mitigate RE beams inefficient, as observed in the JET tokamak. In this thesis, the physics of the interaction between the RE beam and the mitigation MMI in the presence of a cold background plasma is studied.
