  We analyze the generation of kinetic instabilities and their effect on the
energization of ions in non-relativistic, oblique collisionless shocks using a
3D-3V simulation by $\texttt{dHybridR}$, a hybrid particle-in-cell code. At
sufficiently high Mach number, quasi-perpendicular and oblique shocks can
experience rippling of the shock surface caused by kinetic instabilities
arising from free energy in the ion velocity distribution due to the
combination of the incoming ion beam and the population of ions reflected at
the shock front. To understand the role of the ripple on particle energization,
we devise the new instability isolation method to identify the unstable modes
underlying the ripple and interpret the results in terms of the governing
kinetic instability. We generate velocity-space signatures using the
field-particle correlation technique to look at energy transfer in phase space
from the isolated instability driving the shock ripple, providing a viewpoint
on the different dynamics of distinct populations of ions in phase space. We
generate velocity-space signatures of the energy transfer in phase space of the
isolated instability driving the shock ripple using the field-particle
correlation technique. Together, the field-particle correlation technique and
our new instability isolation method provide a unique viewpoint on the
different dynamics of distinct populations of ions in phase space and allow us
to completely characterize the energetics of the collisionless shock under
investigation.
