COS NUV Initial On-Orbit Turn-On and Recovery after Anomalous Shutdown

Details COS NUV Initial On-Orbit Turn-On and Recovery after Anomalous Shutdown COS NUV Initial On-Orbit Turn-On and Recovery after Anomalous Shutdown

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11355w&link_type=abstract

HST Proposal ID #11355. Cycle 17

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Scientific paper

This proposal is designed for the initial turn-on of the COS NUV MAMA detector. The same procedure may later be used to recover the detector after an anomalous shutdown. Anomalous shutdowns can occur as a result of bright object violations which trigger the Bright Scene Detection or Software Global Monitor. Anomalous shutdowns can also occur as a result of MAMA hardware problems. The Initial MAMA turn-on consists of three tests: a signal processing electronics check; a slow high voltage ramp-up to an intermediate voltage; and a slow high voltage ramp-up to the full operating voltage. During each of the two high voltage ramp-ups, diagnostics are performed during a dark time-tag exposure. The turn-on is followed by a MAMA Fold Analysis Test. The complete sequence is contained in visits 1 through 4. If a second execution is required during cycle 17, visits 5 through 8 will be run and another proposal prepared for possible future occurrences. Supports Activities COS-04 and COS-07;

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