  We study lattice QCD with a gauge action, which suppresses small plaquette
values. Thus the MC history is confined to a single topological sector over a
significant time, while other observables are decorrelated. This enables the
cumulation of statistics with a specific topological charge, which is needed
for simulations of QCD in the $\epsilon$-regime. The same action may also be
useful for simulations with dynamical quarks. The update is performed with a
local HMC algorithm.
