! File: 2197C.PROP ! Database: PEPDB ! Date: 17-FEB-1994:03:13:11 coverpage: title_1: FOC SAA NOISE PERFORMANCE (FOC010E) proposal_for: OV/FOC pi_fname: ROBIN pi_lname: LAURANCE pi_inst: ESA/ESTEC pi_country: NETHERLANDS hours_par: 9.00 foc: X time_crit: X ! end of coverpage abstract: line_1: Calculations presently indicate that the radiation levels of the South Atlantic line_2: Anomaly will cause a significant increase in background noise counts but that line_3: event rates induced within the image tubes will be within the normal range of line_4: PDA operation. Thus, there should be no risk of any overload damage and the line_5: purpose of the present activity is to verify carefully that this is in fact the line_6: case. line_8: Revised 10/18/89 & 10/24/89 to match Implementation Plan & Redlines. line_9: 12/19/89 ! ! end of abstract general_form_proposers: lname: LAURANCE fname: ROBIN inst: ESA/ESTEC country: HOLLAND esa: X ! ! end of general_form_proposers block general_form_text: question: 3 section: 1 line_1: This activity assesses the detector noise performance as a function of line_2: proximity to the SAA peak. The detector overload performance through the SAA line_3: and the dark count decay after leaving the SAA will be determined. line_4: A series of exposure sets will be performed such that the first dark count line_5: exposure will occur during the SAA intensities listed below, followed by 3 more line_6: dark exposures and finally an INFLAT exposure. The orbits should be scheduled line_7: such that the listed proton field is the highest field encountered in the line_8: orbit. line_10: First orbit : No SAA encounter line_11: Second orbit: 10 - 50 Protons/cm2/sec. (With E > 50 MeV) line_12: Third orbit : 80 - 120 Protons/cm2/sec. (With E > 50 MeV) line_13: Fourth orbit: 200 - 300 Protons cm2/sec. (With E > 50 MeV) line_14: Fifth orbit : 400 - 600 Protons/cm2/sec. (With E > 50 MeV) line_15: Sixth orbit : >1000 Protons/cm2/sec. (With E > 50 MeV) line_17: The dark count must be determined after each SAA passage, the result will line_18: determine the image sequence for the next level of proton field. The line_19: monitoring of the first four levels of proton field (including the 200 - 300 line_20: proton/cm2/sec level) will use the F/96 detector and may be scheduled for line_21: consecutive orbits. The monitoring of the two highest proton field levels will line_22: use both the F/96 and the F48 detectors and should be scheduled sufficiently line_23: far apart to allow choice of calendars for the monitoring or the next level. ! question: 3 section: 2 line_1: On completion of the "fourth" orbit the detected count rate should be assessed, line_2: if the count rate exceeds 0.5 counts/pixel/sec then the activity should be line_3: terminated. If the count rate is equal to or less than 0.5 counts/pixel/sec line_4: then the next level of proton field is to be monitored by the F/96 and F/48 line_5: detectors (in either order). On completion of the fifth orbit the same line_6: analysis will be required, the results of which will determine if the detector line_7: in use is to be used for monitoring the next proton field level. Operations line_8: between the scheduled orbits must adhere to the requirement that the FOC be line_9: transitioned to STANDBY B/2 mode during SAA encounters. ! question: 5 section: 0 line_1: - Within each exposure logsheet line the FOC restriction stating that the FOC line_2: should be transitioned to STANDBY mode during each SAA passage should NOT be line_3: enforced. line_5: - However, between lines the restriction should be enforced. line_7: - Realtime data will be required to determine sequence of exposures after line_8: "fourth" orbit (see 3 above). If count rate for data obtained during line_9: "fourth" orbit exceeds 0.5 cts/pixel/sec the activity must be terminated, line_10: the higher level of proton fields will not be monitored. If the count rate line_11: for date obtained during the "fifth" orbit exceeds 0.5 cts/pixel/sec then line_12: the relevant detector will not be used to monitor the highest of the proton line_13: fields. ! question: 7 section: 0 line_1: The criteria for assessing the acceptability of the images are as follows: line_3: 1) The mean count rate in the image spanning the peak radiation should be line_4: within acceptable limits. An arbitrary level of 0.5 counts/pixel/sec is line_5: set to ensure that there is no chance of detector overload. If this limit line_6: is exceeded, then the activity will be terminated before the next level line_7: of proton field is encountered. line_9: 2) The dark images taken after exit from the SAA should confirm that long line_10: time constant scintillations are decaying satisfactorily. In particular line_11: there should be no detectable bright structure evident in the last of these line_12: dark images. The flat field image should be examined for any detectable line_13: bright or dark structure which sould indicate the onset of overload damage. line_15: Thus, to summarize, in addition to the timely display of the images, the line_16: capability of readily deriving count rates is also required in the OSS. ! question: 8 section: 0 line_1: FOCOIOE should be performed after completion of FOCOIOC (2137). ! !end of general form text general_form_address: lname: LAURANCE fname: ROBIN category: PI inst: ESA/ESTEC addr_1: POST BUS 299 city: NOORDWIJK 2200 AG country: NETHERLANDS ! ! end of general_form_address records ! No fixed target records found ! No solar system records found ! No generic target records found exposure_logsheet: linenum: 1.100 sequence_1: DEFINE sequence_2: SAA1 targname: DARK config: FOC/96 opmode: IMAGE aperture: 512X512 sp_element: CLEAR num_exp: 1 time_per_exp: 10M priority: 1 req_1: SEQ 1.1 - 1.5 NON-INT; req_2: RT ANALYSIS; ! linenum: 1.200 sequence_1: DEFINE sequence_2: SAA1 targname: DARK config: FOC/96 opmode: IMAGE aperture: 512X512 sp_element: CLEAR num_exp: 1 time_per_exp: 10M priority: 1 req_1: RT ANALYSIS; ! linenum: 1.300 sequence_1: DEFINE sequence_2: SAA1 targname: DARK config: FOC/96 opmode: IMAGE aperture: 512X512 sp_element: CLEAR num_exp: 1 time_per_exp: 10M priority: 1 req_1: RT ANALYSIS; ! linenum: 1.400 sequence_1: DEFINE sequence_2: SAA1 targname: DARK config: FOC/96 opmode: IMAGE aperture: 512X512 sp_element: CLEAR num_exp: 1 time_per_exp: 10M priority: 1 ! linenum: 1.450 sequence_1: DEFINE sequence_2: SAA1 targname: DARK config: FOC/96 opmode: IMAGE aperture: 512X512 sp_element: CLEAR num_exp: 1 time_per_exp: 10M priority: 1 ! linenum: 1.500 sequence_1: DEFINE sequence_2: SAA1 targname: INTFLAT config: FOC/96 opmode: RESEAU aperture: 512X512 num_exp: 1 time_per_exp: 10M priority: 1 param_1: LED=GREEN-2, param_2: LED-STEP=64, ! linenum: 2.100 sequence_1: DEFINE sequence_2: SAA2 targname: DARK config: FOC/48 opmode: IMAGE aperture: 512X512 sp_element: CLEAR num_exp: 1 time_per_exp: 10M priority: 1 req_1: SEQ 2.1 - 2.5 NON-INT; req_2: RT ANALYSIS; ! linenum: 2.200 sequence_1: ^ targname: ^ config: ^ opmode: ^ aperture: ^ sp_element: ^ num_exp: ^ time_per_exp: ^ priority: 1 req_1: RT ANALYSIS; ! linenum: 2.300 sequence_1: ^ targname: ^ config: ^ opmode: ^ aperture: ^ sp_element: ^ num_exp: ^ time_per_exp: ^ priority: 1 req_1: RT ANALYSIS; ! linenum: 2.400 sequence_1: ^ targname: ^ config: ^ opmode: ^ aperture: ^ sp_element: ^ num_exp: ^ time_per_exp: ^ priority: 1 ! linenum: 2.450 sequence_1: DEFINE sequence_2: SAA2 targname: DARK config: FOC/48 opmode: IMAGE aperture: 512X512 sp_element: CLEAR num_exp: 1 time_per_exp: 10M priority: 1 ! linenum: 2.500 sequence_1: ^ targname: INTFLAT config: FOC/48 opmode: RESEAU aperture: 512X512 num_exp: 1 time_per_exp: 10M priority: 1 param_1: LED=GREEN-2, param_2: LED-STEP=16 ! linenum: 6.000 sequence_1: USE sequence_2: SAA1 req_1: SEQ 6-9 WITHIN 1D; comment_1: LINE 6 SHOULD BE PERFORMED DURING AN comment_2: ORBIT WITH NO SAA PASSAGE ! linenum: 7.000 sequence_1: USE sequence_2: SAA1 comment_1: LINE 7 IS TO BE EXECUTED DURING AN comment_2: ORBIT WITH SAA ENCOUNTER WHERE THE comment_3: MAX PROTON FIELD ENCOUNTERED IS 10-50 comment_4: PROTONS/CM2/SEC (WITH E> 50 MEV)-THE comment_5: 1ST EXPOSURE MUST STRADDLE THE MAX comment_6: PROTON FIELD OF THIS ORBIT ! linenum: 8.000 sequence_1: USE sequence_2: SAA1 comment_1: LINE 8 IS TO BE EXECUTED DURING AN comment_2: ORBIT WHERE THE MAX PROTON FIELD comment_3: ENCOUNTERED IS 80-120 PROTONS/CM2/SEC comment_4: (WITH E > 50 MEV)-THE FIRST EXPOSURE comment_5: MUST STRADDLE THE MAX PROTON FIELD OF comment_6: THIS ORBIT ! linenum: 9.000 sequence_1: USE sequence_2: SAA1 comment_1: LINE 9 IS TO BE PERFORMED DURING AN comment_2: ORBIT WHERE THE MAX PROTON FIELD comment_3: ENCOUNTERED IS 200-300 comment_4: PROTONS/CM2/SEC (WITH E > 50 MEV)-THE comment_5: 1ST EXPOSURE MUST STRADDLE THE MAX comment_6: PROTON FIELD OF THIS ORBIT ! linenum: 10.000 sequence_1: USE sequence_2: SAA1 req_2: AFTER 9 BY 21D; comment_1: LINE 10 IS TO BE PERFORMED DURING AN comment_2: ORBIT WHERE THE MAX PROTON FIELD comment_3: ENCOUNTERED IS 400-600 PROTON/CM2/SEC comment_4: (WITH E > 50 MEV)-THE FIRST EXPOSURE comment_5: MUST STRADDLE THE MAX PROTON FIELD OF comment_6: THIS ORBIT ! linenum: 11.000 sequence_1: USE sequence_2: SAA1 req_2: AFTER 10 BY 7D; comment_1: LINE 11 IS TO BE EXECUTED DURING AN comment_2: ORBIT WHERE THE MAX PROTON FIELD comment_3: ENCOUNTERED IS >1000 PROTON/CM2/SEC comment_4: (WITH E > 50 MEV)-THE FIRST EXPOSURE comment_5: MUST STRADDLE THE MAX PROTON FIELD OF comment_6: THIS ORBIT ! linenum: 12.000 sequence_1: USE SAA2 req_1: AFTER 9 BY 21D; comment_1: LINE 12 IS TO BE EXECUTED DURING AN comment_2: ORBIT WHERE THE MAX PROTON FIELD comment_3: ENCOUNTERED IS 400-600 comment_4: PROTONS/CMSQ/SEC (WITH E>50MEV)- THE comment_5: FIRST EXP MUST STRADDLE THE MAX comment_6: PROTON FIELD OF THIS ORBIT. ! linenum: 13.000 sequence_1: USE sequence_2: SAA2 req_1: AFTER 12 BY 7D; comment_1: LINE 13 IS TO BE EXECUTED DURING AN comment_2: ORBIT WHERE THE MAX PROTON FIELD comment_3: ENCONTERED IS >1000 PROTONS/SMSQ/SEC comment_4: (WITH E > 50 MEV) - THE FIRST comment_5: EXPOSURE MUST STRADDLE THE MAX PROTON comment_6: FIELD OF THIS ORBIT. ! ! end of exposure logsheet ! No scan data records found