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WTTM Commissioning Summary
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Latest Results

	Seeing: 0.57arcsec
	Tip/Tilt Gain: .15arcsec, Tip-Tilt Seeing: 0.42arcsec
	Peak Intensity: 45% improvement


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Produce Observing Manual


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	Done
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Manual provides:
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	'Quick Start Guide'
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	Pertinent information for RUN preparation and planning
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	Includes 'Lessons Learned' during the commissioning period (Engineering Results)

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DIQ Improvement estimates

	DIQ with and without tip-tilt corrections (B&I)
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There is no evident dependency on the DIQ improvement and color (B & I).
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Conclusion: 
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		tip-tilt errors maybe dominated by local effects, telescope induced
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		color dependency was dominated by variations in seeing
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		General seeing gain is 0.10 to 0.15 arcsec by using WTTM
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DIQ Improvement estimates

	Compare with Mini-Mo as baseline (static vs. static)
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		No discernable difference.
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	Dependence with guide star magnitude, correction speed, and distance from guide star
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		There is a minimum guide star S/N: Consequence is faint limit is 14th mag (85/15)
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		Recommend tip-tilt corrections at 100Hz or higher
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		Degradation of FWHM has weak dependence with distance from guide star.
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          Radial Dependence is about 0.025" per arcmin and is color independent.
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DIQ Improvement estimates

	PSF Variation across the field
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		Uniform, except for radial dependence.
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		PSF changes only at the very edge of the field
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		Note there is a small inbalance in the tip-tilt amplifiers, fix when resources permit

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Distortion Map
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	WCS constants have been obtained and are in headers (Valdes et. al.)
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	Distortion to be reported on by Van Altena.

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Wavelength Response of Beamsplitters and Diochroic
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		No vender bid on Diochroic
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		85/15 and 95/5 beamsplitters accepted
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...continued

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		One 85/15 beamsplitter's coating has degraded, pursuing options

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CCD Characteristics


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		CCD Characteristics have been measured, see User's manual
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		Further CCD characterization, fat-zero, is not planned.  Await new CCD
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		Single amplifier, no cross-talk, but bright stars do 'crosstalk' to the overscan

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Shutter Characterization

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		Exposure times less than 5sec will require a 'shutter correction'

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		Do not use exposure times less than 1sec

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		Recommend obtaining your own shutter correction data

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Image and Optical Alignment with the IAS mount, Mini-Mo

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		WTTM CCD is aligned to the WNIR optical axis to within 10arcsec

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		WTTM CCD is aligned to Mini-Mo to 30arcsec, good for avoiding MiniMo's gap

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		WTTM pickoff mirror repeats position/alignment to within 2arcsec


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Scattered Light Measurements

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		Bright stars, 10mag or brighter, will create a faint reflection that is predictable

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		Numerous measurements have been made and there is no adverse reflections

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Verify accuracy and completness of header information

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		Done

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		Await to verify WCS constants on-sky this T&E

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WTTM Focus Error Sensing

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		NO.  Use of WTTM Focus Sensing is not recommended

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Integration with WIYN Control System

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		Yes!

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		Telescope guiding works

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		Header information is available

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		Telescope focus can be controlled via WTTM's ARCON

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DADS

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		Done

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Focus Offset with Respect to MiniMo

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		WTTM CCD is about 50um from Mini-Mo in R-band, good enough to call par-focal


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Ask Charles to comment
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Do flatfields work after switching


The question is:  Are flatfields repeatable when switching from WTTM to MiniMo and back?

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		Flatfields adequately calibrate the data (photometery produced, no sky gradient)

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		Tests show that flatfields reproduce with repeated insertion/removal of pickoff mirror

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		Flatfields are not dependent on tip-tilt mirror position.  Avoid field edge.
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User Interface


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The user interface has been simplified, but is essentially unchanged.  
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By not using the WTTM focus sensor, the user interface is much simpler to navigate and use.

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Photometery Demonstration

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		Saha and Claver have successfully reduce photometric standard data, no unusual issues

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		A report of Saha's photometry is included in the user's manual


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WTTM Photometry: Claver 12/03


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WTTM Instrument Throughput

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		WTTM is roughly a 30-35% throughput loss (V-band)

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		See Saha's photometry report for band pass specifics