Proposal_Information Title: FOS CYCLE 5: DISCRIMINATOR TEST Proposal_Category: CAL/FOS Scientific_Category: Cycle: 5 Investigators PI_name: MARTIN, STEPHAN PI_Institution: ST SCI CoI_Name: CHRISTENSEN, JENNIFER CoI_Institution: ST SCI CoI_Name: Koratkar, Anuradha CoI_Institution: ST SCI CoI_Name: Keyes, Charles CoI_Institution: STSCI CoI_Name: Hayes, Jeffery CoI_Institution: STSCI CoI_Name: Dahlem, Micheal CoI_Institution: STSCI Contact: Abstract: The optimal discriminator settings were determined in Cycle 4. Because both the noise and gain are known to be temperature sensitive, it is likely that some fraction of the channels will experience some change in their optimal discriminator settings on orbit. The discriminator/noise test should be run once in cycle 5 to verify the stability of those settings. The FOS high voltage will be brought to approximately one-half the nominal operating voltage (12750 KV), with the REFDAC=250 and the trim focus current at 0. A 60s wait will allow the high voltage to stabilize. The command block YTDN will be run, with the INTFLAT as the source. Total time is xxx hours NON-PRIME. Questions Observing_Description: The FOS high voltage will be brought to approximately one-half the nominal operating voltage (12750 KV), with the REFDAC=250 and the trim focus current at 0. A 60S wait will allow the high voltage to stabilize. The command block YTDN will be run, with the INTFLAT as the source, for the following parameters: FOS/RD DAC values 100-255 1 unit per step 10s exposure time 26M total exposure time 13M total overhead FOS/BL DAC values 100-255 1 unit per step 60s exposure time 91M total exposure time 13M total overhead The exposure times listed above are based on running command blocks YSHDLV (8:37) and YSHVON (1:41). It is advisable that this test be run intermittently throughout the mission. Disable overlight protection. All observations are internal. Real_Time_Justification: Calibration_Justification: Additional_Comments: Fixed_Targets Solar_System_Targets Generic_Targets Scan_Data Visits Visit_Number: 01 Visit_Requirements: On_Hold_Comments: Exposure_number: 10 Target_Name: INTFLAT Config: FOS/RD Opmode: IMAGE Aperture: 4.3 Sp_Element: MIRROR Wavelength: Optional_Parameters: Y-SPACE=0, Y-SIZE=1, COMB=NO, SUB-STEP=1,DHV-DAC=12.74, DISCSTART=101, DREF-DAC=49.12,DHV-DELAY=60 Number_of_iterations:1 Time_Per_Exposure: 26M Special_Requirements: Comments: TRIM FOCUS CURRENT=0. TURN OFF OVERLIGHT; PERFORM DISCRIMINATOR OBSERVATIONS AT ONLY ODD VALUED THRESHOLDS. START AT DISC 101. Visit_Number: 02 Visit_Requirements: AFTER 01 BY 12H TO 36H On_Hold_Comments: Exposure_number: 10 Target_Name: INTFLAT Config: FOS/RD Opmode: IMAGE Aperture: 4.3 Sp_Element: MIRROR Wavelength: Optional_Parameters: Y-SPACE=0, Y-SIZE=1, COMB=NO, SUB-STEP=1, DHV-DAC=12.74, DISCSTART=100, DREF-DAC=49.12,DHV-DELAY=60 Number_of_iterations:1 Time_Per_Exposure: 26M Special_Requirements: Comments: TRIM FOCUS CURRENT=0. TURN OFF OVERLIGHT; PERFORM DISCRIMINATOR OBSERVATIONS AT ONLY EVEN VALUED THRESHOLDS. START AT DISC 100. Visit_Number: 03 Visit_Requirements: On_Hold_Comments: Exposure_number: 10 Target_Name: INTFLAT Config: FOS/BL Opmode: IMAGE Aperture: 4.3 Sp_Element: MIRROR Wavelength: Optional_Parameters: Y-SPACE=0, Y-SIZE=1, COMB=NO, SUB-STEP=1,DHV-DAC=12.74, DISCSTART=101, DREF-DAC=49.12, DHV-DELAY=60 Number_of_iterations:1 Time_Per_Exposure: 45.5M Special_Requirements: Comments: TRIM FOCUS CURRENT=0. TURN OFF OVERLIGHT; PERFORM DISCRIMINATOR OBSERVATIONS AT ONLY ODD VALUED THRESHOLDS. Visit_Number: 04 Visit_Requirements: AFTER 03 BY 12H TO 36H On_Hold_Comments: Exposure_number: 10 Target_Name: INTFLAT Config: FOS/BL Opmode: IMAGE Aperture: 4.3 Sp_Element: MIRROR Wavelength: Optional_Parameters: Y-SPACE=0, Y-SIZE=1, COMB=NO, SUB-STEP=1, DHV-DAC=12.74, DISCSTART=100, DREF-DAC=49.1, DHV-DELAY=60 Number_of_iterations:1 Time_Per_Exposure: 45.5M Special_Requirements: Comments: TRIM FOCUS CURRENT=0. TURN OFF OVERLIGHT; PERFORM DISCRIMINATOR OBSERVATIONS AT ONLY EVEN VALUED THRESHOLDS. Data_Distribution Medium: 8MM Blocking_Factor: 10 Ship_To: PI_Address Ship_Via: UPS Recipient_Email: