Wavefronts from the testing on 3/21/08 using the rotating atmospheric turbulence simulator plate. On the left is the reconstructed wavefront using data from the open-loop wavefront sensor. On the right is the DM shape (actually, the voltages being sent to the DM) with the system operating in closed loop, i.e. controlled using the closed-loop wavefront sensor. The data are simultaneous and show how similar the open-loop measured wavefront is to the actual wavefront (which is being followed by the DM in closed loop). Notice that the tubulator motor sticks once in a while, causing the pattern to momentarily pause.