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Synchrotron radiation from runaway electrons in plasmas

Adam Stahl (Institutionen för teknisk fysik, Nukleär teknik)
Göteborg : Chalmers University of Technology, 2015. - 95 s.
[Licentiatavhandling]

Highly relativistic runaway electrons are of great concern in the area of fusion energy research, since their presence in tokamak plasmas have the potential to hinder the successful and stable operation of the device, and potentially cause severe structural damage. In this thesis, runaway electron generation dynamics is investigated using the newly developed efficient computational tool CODE. A particular emphasis is given to the synchrotron radiation emitted by the runaways, as this is an important source of information about their properties. The synchrotron emission spectrum is studied, as well as the effects of radiation back-reaction on the electron distribution and the runaway electron dynamics. Synchrotron emission back-reaction is found to have a significant impact on the runaway distribution, leading to an increase in the critical electric field for runaway generation, as well as the appearance of non-monotonic features in the runaway tail for electric-field strengths above a certain threshold, potentially acting as a source of bump-on-tail instabilities. Both of these effects may contribute to reduce the severity of the runaway problem, although their importance is largest at high temperatures and low densities, likely making the impact in a tokamak disruption scenario limited. It is also found that the previously used approximation of considering only the emission from the most strongly emitting particles when modeling the synchrotron spectrum from runaway distributions can produce highly inaccurate results, and that the use of the full runaway distribution in this context is necessary.

Nyckelord: runaway electrons, synchrotron radiation, critical electric field, fusion plasma physics, tokamak



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Denna post skapades 2015-03-06. Senast ändrad 2016-04-28.
CPL Pubid: 213448

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Nukleär teknik (2006-2015)

Ämnesområden

Energi
Fysik
Fusion, plasma och rymdfysik
Plasmafysik
Plasmafysik med fusion

Chalmers infrastruktur

Relaterade publikationer

Inkluderade delarbeten:


Synchrotron radiation from a runaway electron distribution in tokamaks


Numerical calculation of the runaway electron distribution function and associated synchrotron emission


Effective Critical Electric Field for Runaway-Electron Generation


Radiation reaction induced non-monotonic features in runaway electron distributions


Examination

Datum: 2015-03-27
Tid: 13:30
Lokal: PJ-salen, Fysikgården 1, Chalmers University of Technology, Göteborg
Opponent: Dr. Håkan Smith, Max-Planck Institute for Plasma Physics, Greifswald, Germany

Ingår i serie

CTH-NT - Chalmers University of Technology, Nuclear Engineering 308