June 4: Measure Stability with Radiator Panel Rebolted

• Configuration:

  • ACS: Assembled with Panel Bolts Re-Tightened
  • Mounting: In Dolly, in Square with Radiator Facing Up & Parallel to Floor
  • Cooling: Chillers
  • Optical Source: HRC Coronagraph Backlight
  • Starting Temp: Ambient at Start of Day

• Figures:

  • Stability track: ( GIF, Postscript )

• Results:

  • Executed Test Sequence Identical to Previous Day for Apples-Apples Comparison
  • Resulting Pixel Motion Nearly Identical to Previous Day, Except:
    • Warm-up Effect Barely Present
      • Possibly because ACS Started 1C Warmer?
      • Possibly because Enclosure is More Resistant to Shape Changes with Panel?
    • HRC Set Point Change Caused Slope Change
      • This Effect Probably Occurred Yesterday but was Masked by Warm-up Effect
    • "Rolling" Effect Larger Magnitude
      • Rolling Appears Correlated with JIN2PANT Enclosure Panel Temperature
    • Except for Rolling, Stability is Better with Enclosure Panel Bolts Torqued