MODS2 AGw Commissioning Report

*19 November 2014

• Douglas Miller
• 1 1/3 nights
  • 2/3 night on Sunday Night
  • 2/3 night on Tuesday

Summary

The guide probe 0,0 position is about 9 guide camera pixels from the center of rotation

The guide probe 0,0 position was measured by taking a long exposure guider image while rotating the MODS2 instrument rotator 270 degrees and measuring, with DS9, the center of the guide star circle.

• Measured CofR
  • Center of the arc was measured to be at 190, 184 pixels.
• Current CofR
  • Guider hotspot is 267.0,240.0.
  • Guider ROI is "85 51 449 424"
    • X_CofR = 267.0 - 85 = 182
    • Y_CofR = 240.0 - 51 = 189
• Difference = 9.4 pixels

to be within 6 guide camera pixel of the center of rotation

• MODS2 Guide probe center of rotation.
  • The large green circle traces the guide star arc
  • The green X is the center of guide star arc
  • The red circle is the position of the guider hotspot
    

The guide probe hotspot of 267.0, 240.0 is acceptable, but y should be changed to 239.0

• MODS2 Average Shack Spot Position -vs- Elevation:
  

The wfs lenslet grid position determined to be 266.0, 111.5

• MODS2 Lenslet Array Position:
  

The on-axis wfs pupil center determined to be 402.6, 222.6

• MODS2 On-Axis Pupil Center Position:
  

-- %USERSIG{DougMiller - 2014-11-19}%