Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 4098c Report Date: 09-May-96:19:11 Version: ********** Check-in Date: ********** 1.Proposal Title: FOS DISCRIMINATOR TEST ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID CAL/FOS 2826 Sub Category ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone John Fitch STSCI U.S.A. 301-338-4493 ------------------------------------------------------------------------------------ 7. Abstract The optimal discriminator settings were determined in OV. Because both the noise and gain are known to be temperature sensitive, it is likely that some fraction of the channels wil experience some change in their optimal discriminator settings on orbit. The discriminator/noise test should be run once in cycle 2 to verify the stability of those settingxs. 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 3.0 hours NON-PRIME. ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 0 par: 3.00 10. Num targs pri: 0 par: 0 ------------------------------------------------------------------------------------ 11. Instruments requested: FOS ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 4098c PI: John Fitch Proposal Title: FOS DISCRIMINATOR TEST ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ Anne Kinney STSCI U.S.A. John Fitch SPACE TELESCOPE SCIENCE U.S.A. INSTITUTE ------------------------------------------------------------------------------------ 2. Scientific Justification. In order to get the best scientific results from the FOS, we must optimize both the quantum efficiency and noise characteristics of the individual detectors. The primary means of doing so is to properly set the discriminator for each channel to reject noise pulses while accepting all pulses due to real, detected photons. ------------------------------------------------------------------------------------ 3. Description of proposed observations. 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 FOS/BL DAC values 100-255 DAC values 100-255 1 unit per step 1 unit per step 10s exposure time 30s exposure time 26M total exposure time 78M total exposure time 13M total overhead 13M total overhead The exposure time in lines 1.0 and 10.0 is based on running command blocks YSHDLV (8:37) and YSHVON (1:41). ------------------------------------------------------------------------------------ 5. Description of special scheduling requirements. It is advisable that this test be run intermittently throughout the mission. Disable overlight protection. ------------------------------------------------------------------------------------ 6. Description of special calibration exposures. All observations are internal. ------------------------------------------------------------------------------------ 7. Data reduction and analysis plans. Data reduction and analysis will be performed at the ST ScI. ------------------------------------------------------------------------------------ 11. Address Information Name: JOHN FITCH Category: PI Institution: ST SCI Address: 3700 SAN MARTIN DRIVE City: BALTIMORE State: MD Zip Code: 21218 Country: USA Telephone: Telex (or e-mail): ------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 4098c [ 3] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 | 11 | 12 |13 |14| 15 ------------------------------------------------------------------------------------------------------------------------------------ Line | Seq | Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | S/N |Flx|Pr| Special Number | Name | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| |Rel. Time|Ref| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 DARK S/C POINTIN V1 1 2.5M 1 SEQ 1-3 NON-INT G CYCLE 2 / 1-12.3 Comments: SET THE HV DAC TO 512(DECIMAL), DISC. REFDAC=250, TRIM FOCUS CURRENT=0. WAIT 60S FOR HV STABILIZATION. EXECUTE DUBMY HOLD FOR ENABLING ALL CHANNELS. ------------------------------------------------------------------------------------------------------------------------------------ 3 INTFLAT FOS/RD IMAGE 4.3 MIRROR SUB-STEP=1 1 13.0M 1 COMB=NO Y-SIZE=1 Y-SPACE=0 Comments: TURN OFF OVERLIGHT; PERFORM DISCRIMINATOR OBSERVATIONS AT ONLY ODD VALUED THRESHOLDS. START AT DISC 101. ------------------------------------------------------------------------------------------------------------------------------------ 3.1 DARK S/C POINTIN V1 1 2.5M 1 SEQ 3.1-3.3 NON- G INT AFTER 3.0 BY 24H+/ -12H Comments: SET THE HV DAC TO 512(DECIMAL), DISC. REFDAC=250, TRIM FOCUS CURRENT=0. WAIT 60S FOR HV STABILIZATION. EXECUTE DUMMY HOLD FOR ENABLING ALL CHANNELS. ------------------------------------------------------------------------------------------------------------------------------------ 3.3 INTFLAT FOS/RD IMAGE 4.3 MIRROR SUB-STEP=1 1 13.0M 1 COMB=NO Y-SIZE=1 Y-SPACE=0 Comments: TURN OFF OVERLIGHT; PERFORM DISCRIMINATOR OBSERVATIONS AT ONLY EVEN VALUED THRESHOLDS. START AT DISC 100. ------------------------------------------------------------------------------------------------------------------------------------ 10 DARK S/C POINTIN V1 1 2.5M 1 SEQ 10-12 NON-INT G Comments: SET THE HV DAC TO 512(DECIMAL), DISC. REFDAC=250, TRIM FOCUS CURRENT=0. WAIT 60S FOR HV STABILIZATION. EXECUTE DUMMY HOLD FOR ENABLING ALL CHANNELS. ------------------------------------------------------------------------------------------------------------------------------------ 12 INTFLAT FOS/BL IMAGE 4.3 MIRROR SUB-STEP=1 1 78.0M 1 COMB=NO Y-SIZE=1 Y-SPACE=0 Comments: TURN OFF OVERLIGHT; PERFORM DISCRIMINATOR OBSERVATIONS AT ONLY ODD VALUED THRESHOLDS. START AT DISC 101. ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 4098c [ 4] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 | 11 | 12 |13 |14| 15 ------------------------------------------------------------------------------------------------------------------------------------ Line | Seq | Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | S/N |Flx|Pr| Special Number | Name | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| |Rel. Time|Ref| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 12.1 DARK S/C POINTIN V1 1 2.5M 1 SEQ 12.1-12.3 NON- G INT AFTER 12.0 BY 24H+ /-12H Comments: SET THE HV DAC TO 512(DECIMAL), DISC. REFDAC=250, TRIM FOCUS CURRENT=0. WAIT 60S FOR HV STABILIZATION. EXECUTE DUMMY HOLD FOR ENABLING ALL CHANNELS. ------------------------------------------------------------------------------------------------------------------------------------ 12.3 INTFLAT FOS/BL IMAGE 4.3 MIRROR SUB-STEP=1 1 78.0M 1 COMB=NO Y-SIZE=1 Y-SPACE=0 Comments: TURN OFF OVERLIGHT; PERFORM DISCRIMINATOR OBSERVATIONS AT ONLY EVEN VALUED THRESHOLDS. START AT DISC 100. ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 4098c [ 5] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations S/C FOS/RD FOS/BL ------------------------------------------------------------------------------------------------------------------------------------ Opmodes POINTING IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters SUB-STEP=1 COMB=NO Y-SIZE=1 Y-SPACE=0 ------------------------------------------------------------------------------------------------------------------------------------ Proposal for CAL/FOS ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements SEQ 1-3 NON-INT; CYCLE 2 / 1-12.3; SEQ 3.1-3.3 NON-INT; AFTER 3.0 BY 24H+/-12H; SEQ 10-12 NON-INT; SEQ 12.1-12.3 NON-INT; AFTER 12.0 BY 24H+/-12H ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names ------------------------------------------------------------------------------------------------------------------------------------