WFC3 Thermal Vacuum Testing: IR Grism Focus and Tilt Anomalies

Details WFC3 Thermal Vacuum Testing: IR Grism Focus and Tilt Anomalies WFC3 Thermal Vacuum Testing: IR Grism Focus and Tilt Anomalies

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005wfc..rept....6b&link_type=abstract

Instrument Science Report WFC3 2005-06, 13 pages

Physics

Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3, Thermal Vacuum Test, Ir Channel

Scientific paper

The WFC3 thermal-vacuum testing performed in the Fall of 2004 has revealed anomalies concerning the two grisms installed in the IR channel of the instrument. First, the grisms do not produce in-focus images, the cause of which has been traced to a 90 degree rotation error in the way the grisms were mounted in the filter wheel. Second, both grisms show a residual tilt of their dispersion axes relative to the detector axes of ~8.3 degrees, which is far larger than what would be expected from random uncertainties in their mounting.

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