Hot-tail runaway electron generation in cooling fusion plasmas
Typ
Examensarbete för masterexamen
Program
Publicerad
2020
Författare
Svenningsson, Ida
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
Runaway electrons pose a threat to safe operation of magnetic confinement fusion
reactors due to the damage they can cause on the reactor wall. During a fast cooling
of a fusion plasma, the electric field strength increases and high-energy electrons are
accelerated to relativistic speeds, a process called hot-tail runaway generation. To
mitigate their effect, reliable and efficient theoretical models to predict generation of
hot-tail electrons are of importance. Current numerical methods are computationally
expensive and the accuracy of available analytical models has not been found
satisfactory. In this work, analytical and simplified numerical models for hot-tail
generation including a self-consistent description of the electric field are proposed.
The models are benchmarked against numerical simulations and their regions of
validity are explored.
Beskrivning
Ämne/nyckelord
plasma , runaway , hot-tail , fusion , tokamak disruptions