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We present simulations of ignition and burn based on the Highfoot andHigh-Density Carbon indirect drive designs of the National Ignition Facilityfor three regimes of alpha-heating - self-heating, robust ignition andpropagating burn - exploring hotspot power balance, perturbations andhydrodynamic scaling. A Monte-Carlo Particle-in-Cell charged particle transportpackage for the radiation-magnetohydrodynamics code Chimera was developed forthis work. Hotspot power balance between alpha-heating, electron thermalconduction and radiation was studied in 1D for each regime, and the impact ofperturbations on this power balance explored in 3D using a singleRayleigh-Taylor spike. Heat flow into the spike from thermal conduction andalpha-heating increases by $\sim2-3\times$, due to sharper temperaturegradients and increased proximity of the cold, dense material to the mainfusion regions respectively. The radiative contribution remains largelyunaffected in magnitude. Hydrodynamic scaling with capsule size and laserenergy of two perturbation scenarios (a short-wavelength multi-mode & alow-mode radiation asymmetry) is explored in 3D, demonstrating the differinghydrodynamic evolution of the three alpha-heating regimes. The multi-mode yieldincreases faster with scale factor due to more synchronous $PdV$ compressionproducing higher temperatures and densities, and hence stronger bootstrapping.Effects on the hydrodynamic evolution are clearer for stronger alpha-heatingregimes and include: reduced perturbation growth due to ablation fromfire-polishing and stronger thermal conduction; sharper temperature and densitygradients; and increased hotspot pressures which further compress the shell,increase hotspot size and induce faster re-expansion. Faster expansion intoregions of weak confinement is more prominent for stronger alpha-heatingregimes, and can result in loss of confinement.

Burn regimes in the hydrodynamic scaling of perturbed inertial confinement fusion hotspots