Kinetic modelling of runaway electrons in tokamak plasmas
Event details
| Date | 07.07.2015 |
| Hour | 10:30 |
| Speaker | Emelie Nilsson, CEA-Cadarache, F |
| Location |
PPB 019
|
| Category | Conferences - Seminars |
Runaway electron (RE) formation processes are studied with the gyro-averaged 3D bounce-averaged Fokker-Planck solver LUKE including recently implemented effect of knock-on electrons, which can lead to avalanches of relativistic electrons and dramatically increase the number of REs for a given level of toroidal electric field. A large fraction of the knock-on electrons are born in the magnetic trapping domain in momentum-space owing to their high magnetization, which makes the RE population decrease rapidly with the minor radius. The fate of these trapped-electron runaways is investigated.
Through parametric studies of electric field strength, density, temperature and magnetic configuration, parameter domains are defined where primary and secondary generation is dominant. We show that REs can form even in non-disruptive tokamak scenarios. Modelling of RE formation in such scenarios from the Tore Supra and COMPASS tokamaks is performed, using global plasma parameters such as parallel electric field and plasma equilibrium calculated with the fast integrated modelling code METIS. The METIS/LUKE simulations yield the evolution of the electron distribution function and RE population. With this work we aim to contribute to understanding of RE formation processes, and provide information beyond the experimental measurements.
Through parametric studies of electric field strength, density, temperature and magnetic configuration, parameter domains are defined where primary and secondary generation is dominant. We show that REs can form even in non-disruptive tokamak scenarios. Modelling of RE formation in such scenarios from the Tore Supra and COMPASS tokamaks is performed, using global plasma parameters such as parallel electric field and plasma equilibrium calculated with the fast integrated modelling code METIS. The METIS/LUKE simulations yield the evolution of the electron distribution function and RE population. With this work we aim to contribute to understanding of RE formation processes, and provide information beyond the experimental measurements.
Practical information
- Informed public
- Free
Organizer
- Prof. P. Ricci
Contact
- Prof. P. Ricci