June 18: Repeat Compression Test for Repeatability

• Configuration:

  • ACS: Fully Assembled; OFF for this Test to Eliminate Thermal Effects
  • Mounting: In TBF/Diamond
  • Cooling: Chillers
  • Optical Source: None (ACS Off)
  • Starting Temp: Ambient throughout Test (ACS Off)
  • Add'l Sensors: LVDTs to Monitor Motion of Bench Relative to Enclosure & Theodolites to Monitor TBF and ACS Optical Cube Motion

• Figures:

  • Stability track: ( GIF, Postscript )
  • LVDT setup: ( HTML )
  • LVDT data: ( PDF )

• Results:

  • Decompression Reverses Compression Effect with Little or No Hysteresis
  • Compression and Decompression Effects are Repeatable

• Conclusion:

  • Optical Bench Moves with Enclosure
  • Y-Fitting is not Behaving per Design