  We investigate the Fermi acceleration of charged particles in 2D MHD
anti-parallel plasmoid reconnection, finding a drastic enhancement in
energization rate $\dot{\varepsilon}$ over a standard Fermi model of
$\dot{\varepsilon} \sim \varepsilon$. The shrinking particle orbit width around
a magnetic island due to $\vec{E}\times\vec{B}$ drift produces a
$\dot{\varepsilon}_\parallel \sim \varepsilon_\parallel^{1+1/2\chi}$ power law
with $\chi \sim 0.75$. The increase in the maximum possible energy gain of a
particle within a plasmoid due to the enhanced efficiency increases with the
plasmoid size, and is by multiple factors of 10 in the case of solar flares and
much more for larger plasmas. Including effects of the non-constant
$\vec{E}\times\vec{B}$ drift rates leads to further variation of power law
indices from $\gtrsim 2$ to $\lesssim 1$, decreasing with plasmoid size at the
time of injection.
