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Results of WFC3 Thermal Vacuum Testing - IR Channel Ghosts & Baffle Scatter

ABSTRACT During the Fall 2004 campaign of thermal-vacuum tests on WFC3, we looked for optical ghosts in the IR channel by imaging a saturated point source at various positions on the detector. For the F110W and F160W filters, 34 positions were checked on and off the detector, while the remaining filters were checked at one position in each quadrant. Although the primary image was 10x oversaturated in these checks, no signs of optical ghosts were seen. In an additional test, we scanned a bright point source across the baffle edges, immediately outside of the IR field of view. These scans showed that strong scattering can occur from the baffle edge, especially along the upper baffle edge. The strongest glints from the baffle edge contained ~20% of the source flux and were spread over a large area of the detector. The baffle installation is under investigation.