Magnetized Inertial Fusion Techniques and Applications

Magnetized inertial fusion combines the rapid compression of fuel characteristic of inertial confinement with an applied magnetic field to inhibit thermal losses and enhance confinement. In a typical approach, a pre-magnetised cylindrical liner collapses under a pulsed-power drive, compressing a magnetised plasma fuel that has been preheated by a laser or particle beam. The axial magnetic field suppresses electron thermal conduction and stabilises the implosion against hydrodynamic instabilities, thereby reducing the stringent requirements on driver energy. This hybrid methodology offers a promising route to compact fusion energy sources, high-flux neutron production for materials testing and medical isotopes, and scaled laboratory studies of astrophysical phenomena. Advances in diagnostic capability and simulation are rapidly improving control over implosion symmetry, magnetic insulation and energy coupling, bringing net energy gain closer to realisation.

Research from Nature Portfolio

Recent studies have implemented collective Thomson scattering with Bayesian inference to probe gas-puff stagnation under axial magnetic fields. This work characterised the transition from weakly collisional to collisional regimes as the liner converged, revealing that ion kinetic energy may account for more than 90 % of total energy early in the implosion. Analysis indicates that an azimuthal magnetic field exceeding 4.7 T can deflect ions, thereby affecting energy partition and confinement. The integration of advanced statistical methods has yielded more accurate plasma parameter estimates, informing optimisation of magnetic field strength and timing.

Magnetized Inertial Fusion Techniques and Applications publication trend

The graph below shows the total number of articles in magnetized inertial fusion techniques and applications across all publications each year (not limited to Nature Index journals).

Technical terms

Inertial confinement fusion: Fusion approach that compresses and heats fuel rapidly by the inertia of an imploding shell or liner.

Z-pinch: Pulsed-power configuration in which an axial current generates a self-magnetic field that radially compresses plasma.

Liner: Cylindrical shell, typically metallic, driven inward by magnetic pressure to compress fusion fuel.

Magnetized Liner Inertial Fusion (MagLIF): Inertial fusion concept that uses an axial magnetic field and preheat to reduce energy losses during liner-driven implosion.

Thomson scattering: Diagnostic technique using laser light scattered by electrons to infer local plasma density and temperature.

References

1. Bayesian inference of plasma parameters from collective Thomson scattering technique on a gas-puff near stagnation. Scientific Reports (2023).
2. Mallat Scattering Transformation based surrogate for Magnetohydrodynamics. Computational Mechanics (2023).
3. Performance Scaling in Magnetized Liner Inertial Fusion Experiments. Physical Review Letters (2020).
4. Scaling magnetized liner inertial fusion on Z and future pulsed-power accelerators. Physics of Plasmas (2016).