Trap your alphas: Fast particle motion in fusion plasmas | Alena Gogoleva

Presenter: Dr. Alena Gogoleva , UC3M, Madrid, Spain

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Date: November 11th, 2020

Synopsis: One of the main difficulties to attain economically viable magnetically controlled thermonuclear fusion reactors is the confinement of alpha particles. In toroidally shaped fusion devices with a non-uniform magnetic field, alpha particles with small parallel velocity become trapped between areas of the high field, bouncing between reflection points, that might result in non-zero radial average drifts and their losses. This talk aims to highlight the link between the alpha particle transport and the confining magnetic field with an emphasis on the trapped particle characterization.
00:00:03 - Speaker bio
00:01:19 - Intro by the speaker
00:02:06 - Outline of the talk
00:02:49 - Basics of Nuclear fusion
00:05:11 - Quasi-symmetry
00:06:50 - Single particle motion in a non-uniform magnetic field
00:08:00 - Particle loss mechanisms in a non-uniform magnetic field
00:09:05 - Objectives
00:09:51 - Basic approach and equations of motion
00:11:40 - Study of 5 magnetic configurations
00:13:19 - Loss fraction of alpha-particles over time
00:14:49 - Impact of magnetic configuration and the initial conditions on the losses
00:16:14 - Orbit classification
00:18:05 - Banana orbit characterization
00:19:26 - ITER bouncing times and banana widths
00:21:13 - PDF of bouncing time, orbit width and radial orbit displacement
00:22:46 - Transport dynamics
00:21:28 - Transport coefficient
00:25:34 - Summary
00:27:30 - Q&A session

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