Tracker Alignment System

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Tracker Alignment System

• Chris Tutt
• AMS-02 Project Manager

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Review of Hazard

• Hazard to be addressed is uncontrolled use of
  lasers causing optical damage to personnel or
  equipment.
• Tracker Alignment System (TAS) uses a series of
  infrared lasers to measure relative movements of
  the tracker planes.

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TAS System Schematic
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Laser Safety Analysis

• Nominal Optical Hazard Distance (NOHD) calculated
  for TAS lasers at three key locations in the
  system per ANSI standard.
• Emission at diode window 2.78 cm
• Emission at LFCR output 4.64 cm
• Emission at LBBX output 6.81 m
• Only LBBX output is significant distance, but
  that beam is trapped in tracker inner volume.
• Tracker inner volume has light-tight vents.
• All TAS hardware underneath MLI blankets.

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Upper LBBXs Installed Position
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TRD/UTOF Installed Position
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Lower LBBX Installed Position
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Lower USS Installed Position
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LFCR Installed Position
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Proposed Safety Controls

• TAS lasers are low-power, diffuse, and completely
  contained within tracker inner volume.
• No special safety controls are needed during
  nominal operations.
• LBBXs are inaccessible to ground personnel
  without dismantling payload.
• LFCRs are accessible if MLI removed, but any
  maintenance operations would be done by trained
  personnel.
• TAS system will only be powered on during most of
  KSC stay.
• KSC concurrence documented in Use Authorization
  K-GU-50101.