Computer Science
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11350w&link_type=abstract
HST Proposal ID #11350. Cycle 17
Computer Science
Scientific paper
This proposal addresses the concerns over Cesium migration from the FUV-MAMA photocathode into the pores of the microchannel plate and lays out the procedures necessary to permit a safe and controlled recovery of the FUV-MAMA detector to science. This procedure should only be used during the SMOV4 high voltage recommissioning phase for the FUV-MAMA. After that, the normal ramping procedure should be used. This proposal is loosly based on proposal 10036, STIS MAMA Anomalous Recovery, with the differences summarized below: {1} additional plateaus during voltage commanding, {2} longer dwells after each 50 V step, {3} intermediate ramp re-structured into 2 parts, {4} change in yellow and red limits and the MCP Hi limit, setting new values for the next plateau, and {5} adding a fold test at 300V below the nominal MCP voltage. The recovery consists of four separate and unique procedures {visits} and they must be completed successfully and in order. They are: {1} a signal processing electronics check, {2} 1st high voltage ramp-up to an intermediate MCP voltage of -1500 V with limits modifications and voltage plateaus, {3} 2nd high voltage ramp-up to an intermediate MCP voltage of -1950 V {300 V below the nominal MCP voltage} with limits modifications and voltage plateaus followed by a fold distribution test, and {4} the final high voltage ramp-up to the full operating voltage, again with limits modifications and voltage plateaus, followed by a fold distribution test. During the 1st high voltage ramp-up, diagnostics are performed followed by a dark exposure. During the 2nd and 3rd high voltage ramp-ups, diagnostics are performed followed by a dark, flat field ACCUMs, and a fold analysis test. All required parameters are defined in 07-248 FUV and NUV SMOV Ramp-up Parameters Excel workbook. Supports Activity STIS-17;
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