COS FUV Initial On-Orbit Turn-On

Details COS FUV Initial On-Orbit Turn-On COS FUV Initial On-Orbit Turn-On

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11356w&link_type=abstract

HST Proposal ID #11356. Cycle 17

Physics

Scientific paper

This proposal specifies the procedure for SMOV initial HV turn-on and ramp-up of the COS FUV detector. {The FUV will have been commanded to its Operate state to support execution of proposal 11353.} The procudure is detailed in the Observing Description, but in summary, the following is done: The initial transition from FUV Operate to HVLow is broken into two parts, with a gap of 4 hours between turning on the HV and ramping to the HVLow {SAA} voltage. This will be followed by 5 cycles of HV ramp-up and return to HVLow. Cycles will ramp up to successively higher {magnitude} voltage, with the fifth cycle going to the nominal operating values. There will be a gap of at least 4 hours between cycles. All HV ramp-up will be done at 10 sec per HV "step". The step rate and cycle voltage values {for Sements A and B} must be patched in FSW in each cycle prior to the HV ramp commanding. Memory monitors will be set on the patched memory locations. Immediately after any HV commanding, and 4 hours after ramp-up commanding, the DCE memory will be dumped. Immediately after HV ramp-up commanding higher than HVLow, short DARK & WAVE exposures will be obtained. Visits 01 and 02, and all the subsequent even numbered visits {the ones 4 hours after HV ramp-ups}, end with NSSC-1 COS event flag 3 being set. If the flag remains set, subsequent FUV commanding will be skipped. Thus, Operations Requests must be in place to clear the flag prior to those subsequent visits. Real-time monitoring of the telemetry will be used to guide the decisions whether or not to clear the flag. The final visit {13} provides a scheduled final opportunity to clear flag 3, and if the flag is cleared, initiates nominal FUV HV commanding and requests a DARK exposure. Supports Activity COS-23;

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