Different approaches are being implemented to take care of these issues. The PID control of the image rotator has been tuned to reduce their high-frequency contribution. We are working with the telescope team to tune the motor drives and reduce the impact of the elevation encoder. A Linear Quadratic Gaussian controller (LQG, or Kalman filter) is also being implemented inside SCExAO to control these vibrations. These solutions will not only improve significantly SCExAOs performance, but will also help all the other instruments on the Subaru Telescope, especially the ones behind AO188. Ultimately, this study will also help the development of the TMT, as these two telescopes share very similar drives.
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Julien Lozi, Olivier Guyon, Nemanja Jovanovic, Garima Singh, Sean Goebel, Barnaby Norris, Hirofumi Okita, "Characterizing and mitigating vibrations for SCExAO," Proc. SPIE 9909, Adaptive Optics Systems V, 99090J (26 July 2016);