Tal Miller - Video Lecture

Tal Miller - Video Lecture

IVS-IPSTA 2020 Online Conference December 13, 2020

Afternoon Plasma Session
Session chair:
Ido Barth 

The Hebrew University of Jerusalem


Rate Equations Model of Multiple Mirror Systems

Tal Miller

Rate Equations Model of Multiple Mirror Systems


Abstract

Axial particle loss is one of the main challenges for, fusion aimed, linear magnetic mirror plasma configuration. To mitigate this disadvantage and to increase the confinement time, it was suggested to use a multiple mirrors setup. The idea is to reduce the outgoing lose cone particle flux by collisions in the multiple magnetic cells. Here, we develop a rate equation model for the ions density dynamics including scattering within the magnetic cell and the transmission between neighboring cells. The dominant parameter is the ions mean free path, which depends on the temperature and density in each cell. The steady state flow is studied, analytically and numerically, for three thermodynamic scenarios: isothermal plasma, adiabatic expansion, and the diffusion regime. It is found that the confinement time in the these different scenarios can result in an order of magnitude difference in the confinement time of the plasma, where the adiabatic cooling is the best regime.