Technical aspects of the Space Telescope Imaging Spectrograph Repair (STIS-R)
2008
In August 2004, the Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph (STIS) ceased operation
due to a failure of the 5V mechanism power converter in the Side 2 Low Voltage Power Supply (LVPS2). The failure
precluded movement of any STIS mechanism and, because of the earlier (2001) loss of the Side 1 electronics chain, left
the instrument shuttered and in safe mode after 7.5 years of science operations. A team was assembled to analyze the
fault and to determine if STIS repair (STIS-R) was feasible. The team conclusively pinpointed the Side 2 failure to the
5V mechanism converter, and began studying EVA techniques for opening STIS during Servicing Mission 4 (SM4) to
replace the failed LVPS2 board. The restoration of STIS functionality via surgical repair by astronauts has by now
reached a mature and final design state, and will, along with a similar repair procedure for the Advanced Camera for
Surveys (ACS), represent a first for Hubble servicing. STIS-R will restore full scientific functionality of the
spectrograph on Side 2, while Side 1 will remain inoperative. Because of the high degree of complementarity between
STIS and the new Cosmic Origins Spectrograph (COS, to be installed during SM4)), successful repair of the older
spectrograph is an important scientific objective. In this presentation, we focus on the technical aspects associated with
STIS-R.
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