May 7: Measure Thermal Stability Effect on SBC

• Configuration:

  • ACS: Fully Assembled
  • Mounting: ACS in TBF in Diamond
  • Cooling: Chillers
  • Optical Source: SBC: RAS/Cal Point Source in N2 Purge
  • Starting Temp: Close to Ambient after being off for Lunch

• Figures:

  • Stability track: ( GIF, Postscript )

• Results:

  • Warm-up effect of ~1 pixel seen
  • Chillers-on caused motion of 4-5 pixels
    • Motion is different than HRC effect
    • Indicates that effect is not solely M1 or M2 motion
  • Chillers off reversed the chillers-on effect
  • WFC TECs off/on had no effect on warm-up or chiller trend