SM3B NICMOS Focus Check

Details SM3B NICMOS Focus Check SM3B NICMOS Focus Check

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002nict.rept....1s&link_type=abstract

Technical Instrument Report NICSMOS 2002-001, 10 pages

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Hubble Space Telescope, Hst, Space Telescope Science Institute, Nicmos

Scientific paper

We report determinations of the NICMOS foci following cool down of the NICMOS detectors after installation and activation of the NICMOS Cooling System (NCS). A focus sweep in all three cameras executed on May 3, 2002 (program ID: 8977). Visual inspection of the data indicated that a small amount of coma had been introduced since January 1999. Phase retrieval (STScI) and encircled energy (University of Arizona) measurements were used to determine the best focus positions. The results of the two methods compared quite favorably with each other. Adjustments to the current Pupil Alignment Mechanism (PAM) positions were implemented on May 9, 2002 for Camera 1 & 2 (PAM1 & PAM2). No focus adjustments were implemented for Camera 3 (PAM3) or for the Camera 2 coronagraphic focus (PAMC). Adjustment of the intermediate focus position between Camera 1 & 2 (PAMI) will be managed starting during week 2002.133 by SMS.

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