May 21-25, 2007Phase II FSR1 ISS Hardware Magnetic Susceptibility Testing and Analysis Trent Martin NASA AMS Project Manager

May 21-25, 2007Phase II FSR2 History To minimize operations constraints, the AMS project worked with Hamilton Sundstrand, Boeing, and MacDonald Dettwiler Robotics to ascertain realistic limits for ISS hardware Testing/analysis was performed specifically on EVA equipment and nearby ORU’s Without substantial additional funding MDR was unable to raise the level of certification of the SSRMS above a 10 gauss limit SSRMS limitations may require a reduction in the magnetic field during nearby SSRMS usage

May 21-25, 2007Phase II FSR3 35G 100G 200G 300G 600G 1000G Geometric center of AMS-02 Cryomagnet Y (OUT OF PAGE) Z X Y Z X-RAM (INTO PAGE) ORBITER ISS (PAS)

May 21-25, 2007Phase II FSR4 X Z Y Y Z (into page) X-RAM ISS (PAS) ORBITER 35G 100G 200G 300G 600G Geometric center of AMS-02 Cryomagnet 1000G

May 21-25, 2007Phase II FSR5 Solar Array Rotary Joint AMS S3 Truss ISS Outboard 35G 100G 200G 300G 600G 1000G Adjacent Attached Payload Envelope

May 21-25, 2007Phase II FSR6 AMS with ELC 6 Gauss 10 Gauss 35 Gauss

May 21-25, 2007Phase II FSR7 EVA Tool Testing Testing performed June 5-9, 2000 in Advanced Space Propulsion Lab (ASPL), at the Sonny Carter Facility and at the Hamilton Sundstrand Space Systems EMC Facility The purpose was to evaluate the Extravehicular Mobility Unit (EMU) System level, Flight Accessory, SAFER and PGT equipment operation for exposure to magnetic B field exposure during EVA Equipment was suspended in various orientations and moved through field to determine susceptibility up to a maximum field of 600 gauss Results were documented in Report: FEM-0032 and EMU Results were used to raise certification level of this hardware from 63 gauss, to 300 gauss.

May 21-25, 2007Phase II FSR8 EMU w/ ERCA setup (Horizontal)

May 21-25, 2007Phase II FSR9 EMU w/ ERCA setup (Vertical)

May 21-25, 2007Phase II FSR10 SAFER setup

May 21-25, 2007Phase II FSR11 PGT Setup

May 21-25, 2007Phase II FSR12 Testing of ISS ORU’s near AMS The Boeing Company analyzed and tested nearby ORU’s on the S3 Truss to ensure no susceptibility based on the magnetic field that would be present at their locations No issues were identified

May 21-25, 2007Phase II FSR13 SSRMS No testing has been performed on the Space Station Remote Manipulator Systems (SSRMS) Without other funded analysis MacDonald Dettwiler Robotics (MDR) has certified that the SSRMS can sustain up to 10X the earths magnetic field; roughly 10 gauss (total) Therefore, AMS magnet must either be deactivated while attached to the SSRMS or have a reduced field when SSRMS is operating in close proximity (adjacent attached payload site) While this is not ideal for mission success, AMS accepts this provisional operation for ISS Safety

May 21-25, 2007Phase II FSR14 Magnetic Field Certification Testing –Magnetic Field Mapping of the AMS-02 Cryomagnet –Magnetic Field Testing US EMU –Wireless Video System (WVS)/EMU RF Camera Assembly (ERCA) transmits video but cannot switch lenses when exposed to fields in excess of 350 Gauss. Corrects itself when removed from field. –Magnetic attraction of the EMU flight system equipment may exert a force of 8 lbs 4 oz when exposed at 600 Gauss. At this same level, the SAFER could not provide a means to rescue the crewmember. –300 Gauss set as new limit (factor of safety = 2) Russian Orlan Suit – 175 Gauss set as new limit Pistol Grip Tool (PGT) –Stopped functioning at 250 Gauss, but recovered once removed from field. –No damage at all up to 1000 Gauss. Simplified Aid For EVA Rescue (SAFER) –Experienced no failure at 1000 Gauss

May 21-25, 2007Phase II FSR15 Magnetic Field Certification Analysis –ISS Electromagnetic Effects Panel has reviewed the following items which fall are on the S3 truss – all are acceptable with various caveats Umbilical Mechanism Assembly (UMA) Capture Latch Assembly (CLA) External TV Camera Video Luminaire Assembly Space Station Remote Manipulator System (SSRMS) Special Purpose Dexterous Manipulator (SPDM) RPCM MDM

May 21-25, 2007Phase II FSR16

ComponentDesign Magnetic Field Level Expected Worst Case AMS Magnetic Field Level Keep Out Zone Level or Rational for no Keep Out Zone EMU (Space Suit)300 G1000 G300 G Orlan (Russian Suit)175 G PGT>1000 G1000 G300 G (operates up to 250 G) SAFER> 1000 G1000 G300 G UMANone Established (NE) <6 GFixed hardware that only operates in a field less than 6 G if an adjacent payload is installed – currently not planned External TV CameraNE<6 GFixed Component Video Luminaire Assembly NE<6 GFixed Component SSRMSNE8.4 G10 G SPDMNE8.4 G10 G RPCMNE<6 GFixed Component MDMNE<6 GFixed Component