June 24: "Baseline" Stability in TBF for Comparison to RASHOMS

• Configuration:

  • ACS: Fully Assembled
  • Mounting: In TBF/Diamond with New Linear Bearing B-Latch
  • Cooling: Chillers
  • Optical Source: HRC Coronagraph Spot with Backlight; WFC RAS/Cal
  • Starting Temp: Ambient at Start of Day
  • Add'l Sensors: LVDTs to Monitor Motion of Bench Relative to Enclosure

• Test Sequence for Baseline:

  • T=0 (1300GMT) ACS On/WFC TECs On
  • T=4 Hr HRC TEC On
  • T=7 Hr Chillers On
  • T=11 Hr Chillers Off
  • T=14 Hr Test End

• Figures:

  • WFC stability track: ( GIF, Postscript )
  • HRC stability track: ( GIF, Postscript )
  • Metrology: ( HTML, Excel, notes )
  • LVDT setup: ( HTML )

• Results:

  • "Warmup" and Chillers On Effects Present at ~0.5 pixels &Chillers Off Effect Present at ~1 pixel
  • TBF Cube Motion of ~8 as and AC1 Motion of ~3 as Observed During Chillers On (Optical Cube Data was Taken Only During the Chillers On Segment from 1540-1800)
  • LVDTs Show Small TBF Expansion Correlated w/Chillers On & Off
  • Cube & LVDT DataIndicates Chiller Effect is (Partially?) Caused by TBF Loading the Enclosure