  Motivated by recent experiment on Bloch Oscillation of Bose-Einstein
condensates (BEC) in accelerated optical lattices, we consider the Josephson
dynamics of a BEC in an accelerated double well potential. We show that
acceleration suppresses coherent population oscillation between the two wells.
Accelerating the double well renders the Josephson coupling energy time
dependent and this emerges as a source of dissipation.This dissipative
mechanism helps to stabilize the system.The results are used to interpret
recent experimental results[reference 16].
