XC01: HRMA & SI X-RAY CALIBRATION PLAN

Below is a summary of the XRCF X-Ray Calibration planning detailed in XC01

HRMA & SI PRE-CALIBRATION REHEARSALS

Three Pre-Calibration Rehearsals:

• HRMA (27JUL96 - 23AUG96)
• HRMA/SI (26AUG96 - 10OCT96)
• HRMA GSE Vacuum Infant Mortality Test (10OCT96 - 04NOV96)

Pre-Cal Rehearsals Intended to Simulate Actual X-ray Calibration

• Performed in IC Vacuum
• Use same hardware to extent possible
• Uses same data acquisition hardware
• Dry run of procedures
• Check-out of manpower scheduling and loading
• Currently planned 24hr/dy, 7day/wk operation
• Personnel training

HRMA Pre-Cal Rehearsal

• Simulates Phase 1
• Uses TMA (plus TMA SS) & HXDS
• Missing HRMA GSE

HRMA/SI Pre-Cal Rehearsal

• Simulates Phase 2
• Uses TMA, FAM, FAM Cryoshroud, LASS-Z, ACIS-2C

HRMA GSE Vacuum Infant Mortality Test

• HRMA GSE Vacuum Check-Out
• Uses DSS
• Uses HSS, FCC, ACC & OTG Mechanisms, and HSS
• Uses no Optic and no Focal Plane Detector(TBR)
• Contractually directed by MSFC

HRMA & HRMA/SI CALIBRATION

Three Phases of HRMA/SI X-ray Calibration at the XRCF:

• Phase 0: HRMA Thermal Balance Testing (04NOV96 - 04DEC96)
  - 16 IC Vacuum Days
• Phase 1: HRMA X-ray Calibration (04DEC96 - 17JAN97)
  - 30 IC Vacuum Days
• Phase 2:HRMA/SI X-ray Calibration (17JAN97 - 16APR97)
  - 60 IC Vacuum Days

Phase 0: HRMA Thermal Balance Testing

• Uses Instrument Chamber(IC) LN2 Deep Space Simulator (DSS)
• Objectives:
  • Verify flight operation of HRMA Thermal Control System(TCS)
    • Determine HRMA set-point and power requirements under nominal, min, & max telescope thermal conditions
    • Determine HRMA TCS capability to counteract in-spec (2.5oF) telescope diametrical gradients
    • HRMA survival TCS check-out
  • Collect HRMA x-ray imaging performance data under non-optimal 1-g off-loading conditions to verify HRMA performance model predictions
    • X-rays collected using HRMA X-ray Detector Assembly (HXDA)
    • Includes use of HRMA shutters to measure P/H tilt
• Does not include OTG's

Phase 1: HRMA X-ray Calibration

• Performed without DSS (entire IC maintained at telescope nominal 50oF)
• Objectives:
  • Verify HRMA x-ray performance model (i.e. response function) so that on-orbit performance can be predicted to within 1% goal
    - Model needed to predict imaging (e.g. absolute EE, PRF), and spectroscopic(e.g. energy scale, efficiency, PRF) on-orbit performance from ground measurements
  • Determine model parameters in an overdetermined manner
• X-rays collected using HXDA and Beam Normalization Detectors (BND)
• Uses multiple x-ray source types to provide calibration over required energy and resolution range
• Includes OTG's

Phase 2: HRMA/FPSI/OTG X-ray Calibration

• Performed without DSS (entire IC maintained at telescope nominal 50oF)
• Objectives:
  • Verify FPSI response functions so that on-orbit performance can be predicted
    - Model needed to predict imaging (e.g. absolute EE, PRF), and spectroscopic(e.g. energy scale, efficiency, PRF) on-orbit performance from ground measurements
  • Determine model parameters in an overdetermined manner
• X-rays collected using FPSI's and BND
  • FPSI's supported in flight Integrated Science Instrument Model (ISIM) [TBR]
  • ISIM supported by Five Axis Mount which simulates observatory operation in "telescope mode" (i.e. off-axis data collection)
  • ISIM exposed to LN2 cryoshroud which enables ACIS to reach operating temperature and sinks waste heat
• Uses multiple x-ray source types to provide calibration over required energy and resolution range
• Includes OTG's

X-ray Calibration Gantt Chart Summary Schedule

Download an ASCII Version of XC01.

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