CD15 analysis tasks

UPDATED 10/8/13 to link to other blog posts

Some analysis tasks related to CD15.  When done, there should be a short answer and/or link to a blog posting with detailed results.

• Medium mode focus: 

Pinholes gave best spectra at 12 T, best spatial at 9T, and best roundness at 10T or 11T.  See Medium Resolution Pinholes CD015

• High mode focus: 

Looks like echelon/echelle of 13/12 for best results on right side of detector based on Sep 10, 2013 post (cd015-high-res-14um-performance).   For first pass, see High-resolution Focus in CD015

• Filter lightleaks:

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• Filter throughputs:

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• Blackbody efficiency (relating photon flux to temperature - look at KRS5 and lab air transmission)

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• TAAS information (get EXES platescale in arcsec/pixel, EXES f/cone, alignment)

From the updated version of TAAS Summary Post, the FCLS unit is mm and 1 mm = 4.16".  The blog posting has that ~21.5 EXES pixels is 1 mm of FCLS motion or 4.16".  This would give a platescale of 0.1935"/pixel.  Nominal design value is 0.206"/pix for 25 micron pixels and F/10 beam in EXES.  This is a 6% difference.  Close enough for now.

From CD15, Acceptance angle from TAAS post finds that the acceptance angle is 0.060 +/- .004 radians.  The design for the incoming beam from SOFIA is supposed to be f/19.6 or 0.051 radians.  Not sure what to make of this.  Would like to try imaging 2 soldering irons at distance of secondary from entrance window during CD16

• Bounce test (sensitivity to impulsive vibrations when flip mirror against stops and not, motors engaged and not)

See the Sep 18, 2013 Blog posting (bounce-tests-cd015.html) for images.  In high-res at aligned position with motors enabled, see no evidence for bounce. Motors disabled see spots move <spot diameter in both spatial and spectral dimension.  Disabled against the spot is about the same magnitude, but almost purely in spatial direction.  In medium mode, aligned/disabled test looks pretty good, other than the noise.

• Pupil image focus test (may not have worked too well.  Mostly care about internal focus - how well do we image the cold-stop cross hair)

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• Ability to image through different filters (can we image room and/or blackbody without going severely non-linear in select filters)

Checked N04582 and N10247-9.  N04582 worked better, but needed partial array readout and very fast to get just below saturation level (5200 instead of 5000).

• Results of shimming ellipsoid and what to do for next cooldown

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• General light leaks (compare counts with lens wheel on mirror with counts when slit on mirror and with counts in unilluminated regions)

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