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AMS-02 Cryosystem. Phase III Flight Safety Review January 12, 2010 Phil Mott. AMS-02 Cryosystem. Vacuum Case Main Helium Tank Plumbing & Valves. Cryosystem Schematic. SUPER INSULATION & VAPOR COOLED SHIELDS. MAGNET RACETRACK COIL (DIPOLE COIL ROTATED 90 o ). SUPERFLUID HELIUM TANK.

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ams 02 cryosystem

AMS-02 Cryosystem

Phase III Flight Safety Review

January 12, 2010

Phil Mott

ams 02 cryosystem1
AMS-02 Cryosystem
  • Vacuum Case
  • Main Helium Tank
  • Plumbing & Valves
vacuum case






1 x 10-6 TORR


Vacuum Case


  • Vacuum jacket for the superconducting magnet
  • Inner Joint:
    • Welded U groove design
  • Outer Joint:
    • Bolted joint with double o-rings








vacuum case certification
Vacuum Case Certification
  • Helium Leak Tests
    • Both o-rings at all locations and both closeout welds were leak tested to show a better than 1.0 x 10-7 std cc/sec permeation
  • Proof Pressure Test:
    • The VC was successfully pressure tested to 1.8 atm absolute (1.0 x MDP)
  • Closeout Weld
    • Process certified to MSFC-SPEC-504C
    • Inspections
      • Visual
      • Dye Penetrant
      • Ultrasonic
main helium tank
Main Helium Tank
  • 2500 liter toroidal vessel which is constructed from Al 5083
    • All welded structure
  • Helium Leak Test
    • Both halves leak tested along with full assembly
  • Proof Pressure Test
    • Successfully tested to 3.3 bar (MDP is 3.0)
  • Superfluid Helium Leak Test
    • Tank was leak checked after it was assembled inside of the VC due to issues with the ground testing rig. No leaks were found.
burst discs
Burst Discs
  • Both the Vacuum Case and the main helium tank are protected by burst disc. These will be covered in detail in a later presentation.
warm cold valves
Warm & Cold Valves
  • The system uses two sets of gas-actuated valves in order to move the liquid helium around the cryosystem.
    • The cold valves are located on the main helium tank
    • The warm valves are located on the VC
  • Actuation gas comes from the Warm Helium Supply on the VC.
pilot valve vacuum vessel pvvv
Pilot Valve Vacuum Vessel (PVVV)
  • The PVVV contains the pilot valves that control the cold valves inside of the magnet. This prevents heat leak into the actuation lines.
  • System was installed in place, so a proof pressure test to 1.5xMDP cannot be done without risking damage to other components. Equivalent verifications being developed with EP.
  • Vacuum leak checked.
pvvv changes
PVVV Changes
  • Design changed from an all welded configuration to a bolted o-ring seal (for valve replacement if necessary). Does not affect safety.
  • Line added to vent pump from PVVV to pump out helium from valve exhaust for a reduced heat load from L-88 to launch.
warm helium supply
Warm Helium Supply
  • Provides helium that actuate both the warm and cold valves.
  • Covered in detail in a later presentation
superfluid cooling loop scl
Superfluid Cooling Loop (SCL)
  • The SCL is a closed system that is used to continually cool the magnet.
  • A serpentine tube is located inside of the main helium tank and the cooling loop is run along the top and bottom of the magnet coils.
  • The SCL is protected by a 20 bar burst disc that vents into the main helium tank.
  • Nominal operating pressure is 1 bar
cool down circuit
Cool Down Circuit
  • Only used to initially cool down the magnet and after a quench to re-cool the magnet.
  • Tubes run along the top and bottom of the magnet coils and connected by thermal bus bars.
current leads
Current Leads
  • The current leads are used to charge the magnet and are cooled by flowing helium through the middle of the lead.
  • The current leads functioned nominally after the fix was implemented (covered in a separate presentation).
thermo mechanical pump
Thermo-mechanical Pump
  • The thermo-mechanical pump is used to pump helium from the main tank into the cryosystem during re-cooling of the magnet after a quench and during charging.
  • It has no moving parts and is actuated by a heater and primed by surface tension.
  • Both TMP’s function as designed.
porous plug nominal venting
Porous Plug & Nominal Venting
  • As helium in the main tank boils off, it is vented through a porous plug that separates the gas from the superfluid helium.
  • The vapor passes through the Vapor Cooled Shields, and then out through a port on the VC which then splits into three lines.
    • The first line goes to the flight vent, which is used on-orbit
    • The second line goes to a port with a connection to the CGSE pumps, which is used on the ground.
    • The third line goes to the On-Board Pump, which is used during transportation and in the payload bay.
vapor cooled shields vcs
Vapor Cooled Shields (VCS)
  • There are 4 VCS between the helium tank and the VC. As the helium boils off in the main helium tank, it flows through pipework attached to the 4 VCS’s that intercept incoming heat.
  • The VCS’s are constructed from strips of pure aluminum.
  • The VCS’s are separated by layers of superinsulation (aluminized Mylar and nylon netting)
vcs supports
VCS Supports
  • VCS 2 & 4 are supported by a carbon fiber honeycomb structure on the top and bottom. They are connected to each other by a series of wires.
  • Four Stirling-cycle cryocoolers used to remove additional heat from VCS 4 and reduce the external heat leak.
  • The cryocoolers were developed by Sunpower and modified by GSFC for flight.
  • Qualification cooler has been run for twice the nominal mission lifetime without incident.
fill port
Fill Port
  • The Fill Port is only used for ground operations during filling and topping off of the main helium tank.