Speaker
Description
Orbital dynamics of fusion-born alpha particles in Z-pinch geometry are analyzed using magnetic trapping conditions specialized to self-magnetic fields. A magnetic trapping parameter, defined as the ratio of potential-to-kinetic components of canonical momentum, emerges as the key parameter governing orbit characteristics. The analysis reveals a fundamental asymmetry in alpha particle dynamics: products aligned with the plasma current (j·v > 0) execute radial bounce orbits within the pinch core, while counter-aligned products (j·v < 0) exhibit weakly trapped orbits with large excursion radii that may impact the conducting wall, effectively being expelled from the configuration. The trapping analysis quantifies confinement properties and loss mechanisms, providing a means for optimizing alpha particle transport. Monoenergetic and “slowing-down” alpha product distributions are considered within this framework.
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