1. Modified Design of Aries T-Tube Divertor Concept
Jeremy Burke
ARIES-Pathways Project Meeting May 19, 2010

2. Original AREIES-AT T-Tube Design
5 mm thick W armor
W alloy outer tube and inner cartridge
15 mm diameter 100 mm long
Divertor would use ~110,000 units
He at 600 °C and 10 MPa
Transition zone going from W alloy tube to the steel channel
It is expected that the T-Tube divertor concept will be able to handle a 10MW/m2 heat flux.

3. Original T-Tube Thermo-Fluid Results
Thermal loads are calculated with a 10 MW/m2 heat flux on the plasma surface of the W armor, and a volumetric heat generation of 17.5 MW/m3
Max jet velocity = 230 m/s
Coolant pressure drop = ~0.12 MPa
PPumping/Pthermal = ~5.7% (would like to keep this under 10%)
Max coolant temp = 1180 °C

4. Original Design Armor Temperature Distribution
ΔT on plasma face = 225 °C

5. Original T-Tube Thermo-Mechanical Results
Temperature dependent material properties were attained from the ITER Material Properties Handbook
Max armor temperature = 1809 °C
Max tube temperature = 1268 °C (re-crystallization limit ~1300 °C )
Max thermal and primary stresses = 342 MPa (3Sm limit = 450 MPa)

6. Original T-Tube Concept for ARIES-AT VS New Tapered Design
Subject to the same thermal loads and mass flow rate
Original cartridge mm diameter
New cartridge tapers from mm to 2.5 mm at the ends
Armor Surface Heat Flux MW/m3
Volumetric Heat Generation
MW/m3
He Mass Flow Rate g/s

7. New Thermo-Fluid Results
Thermal loads are calculated with a 10 MW/m2 heat flux on the plasma surface of the W armor, and a volumetric heat generation of 17.5 MW/m3
Max jet velocity = 220 m/s
Coolant pressure drop = ~0.105 MPa
PPumping/Pthermal = ~5.7% (would like to keep this under 10%)
Max coolant temperature = 1161 °C

8. New Design Armor Temperature Distribution
ΔT on plasma face = 200 °C

9. New Thermo-Mechanical Results
The same ANSYS Structural setup was used
Max armor temperature = 1791 °C
Max tube temperature = 1246 °C (re-crystallization limit ~1300 °C )
Max thermal and primary stresses = 368 MPa (3Sm limit = 450 MPa)

10. Results Comparison Original Design Tapered Design
Max Velocity – 230 m/s
Pressure Drop – MPa
Max Coolant Temp – 1180°C
Max Armor Temp – 1809 °C
Max Tube Temp – 1263 °C
Max Stress – 342 MPa
Plasma face ΔT = 225 °C
Tapered Design
Max Velocity – 220 m/s
Pressure Drop – MPa
Max Coolant Temp – °C
Max Armor Temp – 1791 °C
Max Tube Temp – 1246 °C
Max Stress MPa
Plasma face ΔT = 200 °C

11. Velocity Profile and Temperature Comparison
New T-Tube has slightly lower max temperature with a more even distribution.
New T-Tube has lower max velocity but the velocity at the end is higher, thus the more even temperature distribution

12. Future Work To date only steady state thermal analysis has been done
Decision must be made on future analysis
Transient thermal loading can be analyzed
Plastic deformation analysis can be performed to determine if the design can be pushed passed the 3Sm limit and potentially go beyond a 10 MW/m2

13. W to Steel Joint Analysis
Graded transition from W alloy to steel manifold
Analysis still needs to be performed