April 15 PM: Compare Dolly/Square Motion when HPs Disconnected

• Configuration:

  • ACS: CCD Heat Pipes Disconnected at IF Plate
  • Mounting: ACS in Handling Dolly in Square Orientation
  • Cooling: Chillers
  • Optical Source: HRC: Coronagraph
  • Starting Temp: Warm after several hours of Operation

• Figures:

  • Stability track: ( GIF, Postscript )

• Results:

  • Note: data noisy due to operating CCDs at room temperature (TEC off)
  • Start warm with chillers on at 14C
  • No apparent motion due to turning chillers off
  • Turning HRC TEC on at 21.9 causes a large jump due to image quality improvement (not a thermal-mechanical effect)
  • Correlation between motion & TEC on/off state identified (due to Housing temp?)
    • Turning HRC TEC off at 22.7 causes small ~0.3 pixel motion
    • Turning HRC TEC on at 23.0 causes TEC-off motion to reverse