Chris TuttAMS-02 Phase II Safety Review1 Tracker Alignment System Chris Tutt AMS-02 Project Manager

Chris TuttAMS-02 Phase II Safety Review2 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.

Chris TuttAMS-02 Phase II Safety Review3 TAS System Schematic

Chris TuttAMS-02 Phase II Safety Review4 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.

Chris TuttAMS-02 Phase II Safety Review5 Upper LBBXs Installed Position

Chris TuttAMS-02 Phase II Safety Review6 TRD/UTOF Installed Position

Chris TuttAMS-02 Phase II Safety Review7 Lower LBBX Installed Position

Chris TuttAMS-02 Phase II Safety Review8 Lower USS Installed Position

Chris TuttAMS-02 Phase II Safety Review9 LFCR Installed Position

Chris TuttAMS-02 Phase II Safety Review10 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