Long-Pulse Fast Ignition in MagLIF

TL;DR

This paper discusses how the MagLIF approach to inertial confinement fusion overcomes traditional fast ignition challenges through its unique geometry and magnetic fields, making fast ignition more practically achievable.

Contribution

It introduces the potential of MagLIF to enable practical fast ignition by relaxing key engineering constraints through its design and magnetic field application.

Findings

MagLIF's large aspect ratio and magnetic fields reduce ignition energy requirements.

MagLIF allows for higher yields and relaxed energy deposition constraints.

MagLIF's design enhances the feasibility of fast ignition in fusion energy.

Abstract

The fast ignition paradigm for inertial confinement fusion (ICF) allows for extremely high gains but requires fuel to be heated very quickly to outpace hotspot disassembly and energy losses. This demands lasers with high power and intensity, posing engineering challenges that have called into question the fundamental practicality of fast ignition. Magnetized liner inertial fusion (MagLIF) circumvents these problems through its large-aspect-ratio cylindrical geometry and strong axial magnetic fields that allow for ignition at lower areal densities. Furthermore, MagLIF's large aspect ratio and higher yields relax other constraints on energy deposition and repetition rate while its axial magnetic fields can be used to collimate ignitor electrons and thereby increase allowed standoff distance and save on ignitor energy. This tremendous overall relaxation of the engineering constraints that have historically limited the practicality of fast ignition suggests that the paradigm may be considerably more viable in a MagLIF context.