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: