aries at project meeting - princeton, nj 18 sept 00 1 aries-at toroidal field (tf) and poloidal...
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ARIES AT Project Meeting - Princeton, NJ 18 Sept 00
1
ARIES-AT Toroidal Field (TF) and Poloidal Field (PF) Coils
Tom Brown, Fred Dahlgren,
Phil Heitzenroeder (PPPL)
September 18, 2000
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ARIES AT TF and PF Design The ARIES AT TF and
PF systems are based on YBCO high temperature SC.
The coil configuration permits full replacement of the blanket/shield modules.
Design is based on Ron Miller’s strawman ver. 306 & Chuck Kessel’s optimized PF system.
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ARIES-AT Configuration Features
• High T SC TF
• No structure between TF outer legs:
• Permits blanket/shield/ divertor module removal.
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Mechanical Arrangement
Double Pan.
TF WindingVV
Blanket/Shield/PFC Module
TF case
PF coils
Solenoid
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5 cm inner case added to TF structure
TF Inboard/Outboard Case Detail
Case structure built up to increase out-of plane stiffness
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5 cm inner shell added to TF inboard leg
VV inner radii set at 2.83 m per strawman (ver 306)
Details of the VV, blanket/shield and div module has not been updated in the TF Pro/E models
Inboard Radial Build
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Configuration Details
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TF System 16 coils B0=5.9 T @R0=5.20 m 9.6 Mat / coil 2400 T/coil; double pancakes Wedged support YBCO Hi T S/C @75K on Inconel
strip Bmax @ S/C=11.1 T Wound construction
– Permits grading; easier fabrication; better field orientation for higher J
Stiffening ribs
Intercoil Structure
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TF Coil Case & Lead Details
• One coil case (shown) is configured for power leads.
•The other 15 coils are configured for coil to coil connections.
Leads
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TF Coil to Coil Bus Connections
Input lead details Coil-coil connection details
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Exploded View of Case Assembly
Total Weight of a Single TF coil is 64 metric tons
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TF Coil Winding Double pancakes will be wound into the coil case channel via
two spools which are sized to limit conductor strain to <0.2%.
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TF Superconductor
•2 pancakes per coil; 20 turns per pancake
•Each turn has 20 x 3 “sub turns” for a total of 2400 turns/coil.
•I / sub turn = 9600 kAt/2400 t = 4 kA
•Jsc=100 kA/sq. cm (10 micron thick film layer assumed). Strain limit 0.2%.
•Superconductor is conduction cooled by case; case is cooled by LN2.
Inconel strip
YBCO Superconductor Strip Packs (20 layers each)
8.5 mm
CeO2 + YSZ insulating coating(on slot & between YBCO layers)
430 mm
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Total Field at
TF Conductor
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Radial Field at TF Conductor
Worst Case field perpendicular to SC in Inner leg : Bmax ~ 2.288 T @ BT=11.1T
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Vertical Field at TF Conductor
Worst Case Field perpendicular to sc in horizontal leg region: ~Bmax ~5.4 T @ JT=100kA/sq.cm
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Conductor Operating Point
Max. B-perp. For TF at 75K ~3.8 T
Bmax., TF
Bromberg and Tekula, “Options for the Use of High Temperature Superconductor in Tokamak Fusion Reactor Design” Jallow., TF=100 kA/sq. cm
Max. B-perp. For PF at 75K ~6 T (@50kA/sq.cm.)
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TF Load Patterns
Out of Plane
In Plane
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Nastran TF Coil/Case Model (reinforced)
Added inner Case Wall (100mm)
Increased Outer Case Radial Depth (950mm)
Increased Case Wall Thickness (160mm)
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Vertical TF Displacements due to Combined Loading (preliminary model)
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TF Displacements due to Combined Loading
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Coil Strain Due to Combined Loading(maximum principal - preliminary model)
Max.Pr..Strain
7.7%
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Coil Strain due to Combined Loading (MaxPrinc.) w/Reinforced Case
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In Plane + Out of Plane Max. Pr. Stress
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In Plane + Out of Plane Tresca Stress On the Case -w/Reinforced Case.
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Poloidal Field SystemCoil R Z I
Number (m) (m) (MA)1 2.25 0.250 -0.6202 2.25 0.750 -1.0533 2.25 1.250 -1.513
OH 4 2.25 1.750 -1.5235 2.25 2.250 -0.6656 2.25 2.750 1.1847 2.25 3.250 3.360
OH
89 10 11 1213
14
8 3.25 5.750 6.3489 3.75 6.000 6.518
Ring 10 5.25 6.300 4.810Coils 11 5.75 6.250 3.643
12 7.50 5.650 -3.27613 8.00 5.400 -5.87714 8.50 5.100 -8.624
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Poloidal Field Coil DesignUses YBCO / Inconel
conductor similar to the TF.
J =55 kA / sq. cm
Gl-Polyimide Electrical Insulation
Inconel strip
“N” subturns of YBCO superconducting strip per slot. N varies with coil I requirements
LN2 chill plates (option: pool boiling design)
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PF - Radial Fields
Peak Radial Field 9.0 TNeed to re-orient the conductor plane to horizontal.
Peak Vertical Field is8.7 T for PF-14 and 6.9 T @ the conductor.
We will need to reduce thecurrent Density in PF-14.
Peak Radial Field is only7.7 T for PF 12 & 13 and 5.9 T @ the conductor.
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PF - Vertical Fields
Peak Vertical Field 9.3 T
Peak Radial Field is only7.7 T for PF 12 & 13 and 5.9 T @ the conductor.
PF-12
PF-13
PF-14
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Alternate PF Coil OrientationThe maximum PF-14 normal field component
will be 7 Tesla, @J = 30kA/sq.cm
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PF Coil Supports & Stresses
CoilR - Z-A-t ksi Mpa ksi Mpa
1 -0.65 4.94 34.2 1.52 10.51842 -1.05 7.98 55.2 2.27 15.70843 -1.55 10.09 69.8 3.27 22.62844 -1.52 9.002 62.3 4.35 30.1025 -6.65 2.306 16 3.04 21.00226 1.18 0.146 1.01 8.36 57.8727 3.36 9.659 66.8 30.9 213.5518 6.52 38.52 267 43.4 299.9829 4.81 17.25 119 10.7 74.2516
10 3.64 10.49 72.6 7.15 49.457211 -3 39.81 275 38 262.61412 276 40.5 280 39.9 275.9713 -5.88 49.05 339 48.3 334.37414 -8.62 59.65 413 64 442.742
Ip=0 Ip=12.949 MA
•Stresses are OK: allowable is ~600 MPa. based on 0.2% strain limit of SC ,
•We still have to update drawings to coil & support dimensions used in
analyses.