! File: 5047C.PROP ! Database: PEPDB ! Date: 23-FEB-1994:17:33:27 coverpage: title_1: CYCLE 3 FOS DISCRIMINATOR TEST proposal_for: CAL/FOS pi_fname: THOMAS pi_lname: WHEELER pi_inst: STSCI pi_country: U.S.A. pi_phone: 410-338-4858 hours_par: 3.00 fos: X ! end of coverpage abstract: line_1: The optimal discriminator settings were determined in OV. line_2: Because both the noise and gain are known to be temperature line_3: sensitive, it is likely that some fraction of the channels will line_4: experience some change in their optimal discriminator line_5: settings on orbit. The discriminator/noise test should be line_6: run once in cycle 3 to verify the stability of those settings. line_7: The FOS high voltage will be brought to approximately one-half line_8: the nominal operating voltage (12750 KV), with the REFDAC=250 line_9: and the trim focus current at 0. A 60s wait will allow the high line_10: voltage to stabilize. The command block YTDN will be run, line_11: with the INTFLAT as the source. Total time is 3.0 hours NON-PRIME. ! ! end of abstract general_form_proposers: lname: KINNEY fname: ANNE inst: STSCI country: U.S.A. ! lname: WHEELER fname: THOMAS inst: SPACE TELESCOPE SCIENCE INSTITUTE country: U.S.A. ! lname: TAYLOR fname: CYNTHIA inst: SPACE TELESCOPE SCIENCE INSTITUTE country: U.S.A. ! ! end of general_form_proposers block general_form_text: question: 2 section: 1 line_1: In order to get the best scientific results from the FOS, line_2: we must optimize both the quantum efficiency and noise line_3: characteristics of the individual detectors. The primary line_4: means of doing so is to properly set the discriminator for line_5: each channel to reject noise pulses while accepting all line_6: pulses due to real, detected photons. ! question: 3 section: 1 line_1: The FOS high voltage will be brought to approximately line_2: one-half the nominal operating voltage (12750 KV), with line_3: the REFDAC=250 and the trim focus current at 0. A 60S line_4: wait will allow the high voltage to stabilize. The command line_5: block YTDN will be run, with the INTFLAT as the source, for line_6: the following parameters: line_8: FOS/RD FOS/BL line_9: DAC values 100-255 DAC values 100-255 line_10: 1 unit per step 1 unit per step line_11: 10s exposure time 30s exposure time line_12: 26M total exposure time 78M total exposure time line_13: 13M total overhead 13M total overhead line_15: The exposure time in lines 1.0 and 10.0 is based on running line_16: command blocks YSHDLV (8:37) and YSHVON (1:41). ! question: 5 section: 1 line_1: It is advisable that this test be run intermittently line_2: throughout the mission. line_4: Disable overlight protection. ! question: 6 section: 1 line_1: All observations are internal. ! question: 7 section: 1 line_1: Data reduction and analysis will be performed at the ST ScI. ! !end of general form text general_form_address: lname: WHEELER fname: THOMAS category: PI inst: ST SCI addr_1: 3700 SAN MARTIN DRIVE city: BALTIMORE state: MD zip: 21218 country: USA ! ! end of general_form_address records ! No fixed target records found ! No solar system records found ! No generic target records found exposure_logsheet: linenum: 1.000 targname: DARK config: S/C opmode: POINTING aperture: V1 num_exp: 1 time_per_exp: 2.5M priority: 1 req_1: SEQ 1-3 NON-INT; req_2: CYCLE 3 / 1-12.3; comment_1: SET THE HV DAC TO 512(DECIMAL), comment_2: DISC. REFDAC=250, TRIM comment_3: FOCUS CURRENT=0. WAIT 60S FOR HV comment_4: STABILIZATION. EXECUTE DUBMY HOLD FOR comment_5: ENABLING ALL CHANNELS. ! linenum: 3.000 targname: INTFLAT config: FOS/RD opmode: IMAGE aperture: 4.3 sp_element: MIRROR num_exp: 1 time_per_exp: 13.0M priority: 1 param_1: SUB-STEP=1,COMB=NO, param_2: Y-SIZE=1,Y-SPACE=0 comment_1: TURN OFF OVERLIGHT; comment_2: PERFORM DISCRIMINATOR comment_3: OBSERVATIONS AT ONLY comment_4: ODD VALUED THRESHOLDS. comment_5: START AT DISC 101. ! linenum: 3.100 targname: DARK config: S/C opmode: POINTING aperture: V1 num_exp: 1 time_per_exp: 2.5M priority: 1 req_1: SEQ 3.1-3.3 NON-INT; req_2: AFTER 3.0 BY 24H+/-12H; comment_1: SET THE HV DAC TO 512(DECIMAL), comment_2: DISC. REFDAC=250, TRIM comment_3: FOCUS CURRENT=0. WAIT 60S FOR comment_4: HV STABILIZATION. EXECUTE DUMMY HOLD comment_5: FOR ENABLING ALL CHANNELS. ! linenum: 3.300 targname: INTFLAT config: FOS/RD opmode: IMAGE aperture: 4.3 sp_element: MIRROR num_exp: 1 time_per_exp: 13.0M priority: 1 param_1: SUB-STEP=1,COMB=NO, param_2: Y-SIZE=1,Y-SPACE=0 comment_1: TURN OFF OVERLIGHT; comment_2: PERFORM DISCRIMINATOR comment_3: OBSERVATIONS AT ONLY comment_4: EVEN VALUED THRESHOLDS. comment_5: START AT DISC 100. ! linenum: 10.000 targname: DARK config: S/C opmode: POINTING aperture: V1 num_exp: 1 time_per_exp: 2.5M priority: 1 req_1: SEQ 10-12 NON-INT; comment_1: SET THE HV DAC TO 512(DECIMAL), comment_2: DISC. REFDAC=250, TRIM comment_3: FOCUS CURRENT=0. WAIT 60S FOR HV comment_4: STABILIZATION. EXECUTE DUMMY HOLD FOR comment_5: ENABLING ALL CHANNELS. ! linenum: 12.000 targname: INTFLAT config: FOS/BL opmode: IMAGE aperture: 4.3 sp_element: MIRROR num_exp: 1 time_per_exp: 78.0M priority: 1 param_1: SUB-STEP=1,COMB=NO, param_2: Y-SIZE=1,Y-SPACE=0 comment_1: TURN OFF OVERLIGHT; comment_2: PERFORM DISCRIMINATOR comment_3: OBSERVATIONS AT ONLY comment_4: ODD VALUED THRESHOLDS. comment_5: START AT DISC 101. ! linenum: 12.100 targname: DARK config: S/C opmode: POINTING aperture: V1 num_exp: 1 time_per_exp: 2.5M priority: 1 req_1: SEQ 12.1-12.3 NON-INT; req_2: AFTER 12.0 BY 24H+/-12H comment_1: SET THE HV DAC TO 512(DECIMAL), comment_2: DISC. REFDAC=250, TRIM comment_3: FOCUS CURRENT=0. WAIT 60S FOR HV comment_4: STABILIZATION. EXECUTE DUMMY HOLD FOR comment_5: ENABLING ALL CHANNELS. ! linenum: 12.300 targname: INTFLAT config: FOS/BL opmode: IMAGE aperture: 4.3 sp_element: MIRROR num_exp: 1 time_per_exp: 78.0M priority: 1 param_1: SUB-STEP=1,COMB=NO, param_2: Y-SIZE=1,Y-SPACE=0 comment_1: TURN OFF OVERLIGHT; comment_2: PERFORM DISCRIMINATOR comment_3: OBSERVATIONS AT ONLY comment_4: EVEN VALUED THRESHOLDS. comment_5: START AT DISC 100. ! ! end of exposure logsheet ! No scan data records found