Motor Data

• Fiber Source Positioner
• 1st Turning Mirror
• 1st Dichroic Splitter
• 2nd Dichroic Splitter
• WFS Steering Mirror
• Iris Positioning Motor
• Iris Closing Motor
• WFS Focus Stage
• Field Acq. Camera Focus Stage
• IR Camera Focus Stage
• Bravais Lens Stage

West <-> East

Standard-Speed 850F motors move 0.05 microns/count. Fiber source X positioner is a Standard-Speed 850F (hopefully), max speed = 0.4 mm/sec

20,000 counts/mm = 4 arcsec on the sky = 5,000 counts/arcsec

Fiber sources X positions:

• In: 0 counts
• Out of the way: -300000 counts (-15 mm) (-60 arcsec)
• Hard limit: -346500 counts (-17.3 mm)

X-axis Limits:

• "Down" (West) soft limit: 80000 counts (+4 mm) (+16 arcsec)
• "Up" (East) soft limit: -326000 counts (-17.2mm) (-65.2 arcsec)

South <-> North

Fiber source Y positioner is a High-Speed 850F-HS (hopefully), max speed = 4.75 mm/sec. High-Speed 850F-HS motors move 0.59321 microns/count

1686 counts/mm = 4 arcsec on the sky = 421.5 counts/arcsec

Fiber source positions:

• Out of the way: -47613 counts (-28mm)
• 200 micron out of focus extended source: -15000 counts (-10mm)
• Red light source: 0 counts
• White light source: 17045 counts (+10mm)

 

 
 
 
 
 

Y-axis Limits:
 

• "Out" (South) limit: 31114 counts (+18.5mm) (+74 arcsec)
• "In" (North) limit: -53187 counts (-31.5mm) (-126 arcsec)

• Iris positioning motors are mounted diagonally with respect to the NSEW axes of the AO bench
• Plate scale is 0.429 mm/arcsec
• Motor is "high speed" 1686 counts/mm
• The Motors/Field_Steer/Iris_Position GUI controls these motors along NS an EW axes for convenience
• Set Zero at the center line of the wfs optics

• This motor opens and closes the wavefront sensor iris
• Negative counts close the iris, Positive counts open the iris
• 0 counts is fully closed: a 2 mm diameter hole
• Approx. 5000 counts/mm diameter openning
• 34,176 counts is upper limit (9 mm diameter openning)
• Plate scale is 0.429 mm/arcsec

• Away-from-light limit is ~80mm = +400,000 counts
• 5,000 counts/mm
• + is away from the light
• NGS position is 0 counts, LGS position is (calculated) at +77mm = 385,000 counts
• Roughly 10,000 counts per "unit" of focus on the centroid diagnostic GUI
• We need to determine the LGS and NGS focal positions and have a look-up table for LGS focus vs zenith angle

• 25,000 counts/mm
• + is toward the light
• Physical limits: +/- 15 mm = +/- 375,000 counts
• Depth of focus ~1/2 mm

• 5,000 counts/mm
• + is away from the light
• Physical limits: +/- 100,000 counts = +/- 20 mm
• Depth of focus ~1 mm

• Out-of-the-way (Scoring mode): +836054 counts
• Lens in (Acquisition mode): 0 counts