1. Dipole Project for Fusion
Ettore Salpietro
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2. Scope ITER Conductors R&D & QA
Gain Confidence on Operability of Coils with Advanced Strands
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3. Planning Project approved by supervisory board Concept Selection
Engineering Design
Contract for dipole manufacturing to be signed in 2005
Facility Operational in 2008
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4. Gantt View
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5. Concept Selection Specification for concept selection
3 Conceptual designs: Cos(teta), race track cold and warm bore
2 strand options 1100 and 2000 A/mm2 at 4.2K and 12 T
Graded allowed
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6. Dipole concept specfications
1.                  Void fraction
Use 32% as reference
Use 4.5 K Tinlet
Check heat removal, cooling length, Dp, DT, (FZK)
2.                  Bore field
Use 12.5 T as minimum guaranteed, +10% as target
3.                  Clear bore dimension
130 mm circular
95 mm x 145 mm rectangular
Cold, rectangular (EFDA)
Warm, rectangular (FZK)
Cold, circular (CEA)
4.                  Length:
L=1.5 m at B>=12.5 T
5.                  AC operation (see ITER scenario)
6.                  High/low jnc,ref
Jc strand=2000 A/mm2 at 4K,12T
Provide scaling law for jc, cost/kg, AC losses (US+CEA)
1100 A/mm2
use 0.81 mm diameter
Provide scaling law for jc, cost/kg, AC losses (Durham, Twente)
Use eop=-0.6 % for CICC design
  Bref=12 T, Tref=4.2 K, eref=-0.25%
Dipole concept specfications
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7. ITER Scenario 2
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8. ITER Plasma Disruption
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9. 25/02/2019
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Advanced Strand 2000

10. Graded dipole optimization
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11. Draft Dipole Parameters Cold Bore
B0 = T
W =140 mm
GRADING Option 1
(Jref=2000 A/mm2)
High field
Low field
Bpeak
13 T
10 T
Dstrand
0.81 mm
Cu/NCu 1
Void Fraction
32%
Cosq cable
0.95
Tcs
4.8 K
Tin
4.5 K
Conductor width
7.8 mm
10.8 mm
Conductor height
22 mm
11 mm
Jacket thick.
1.75 mm
2 mm
Insulation thick.
0.4 mm
Jnc
866 A/mm2
1988 A/mm2
Jop
92 A/mm2
134 A/mm2
Istrand
223 A
512 A
NXturn 5 9
NYturn 14 28
Stages
3x3x3x3
3x3x4
Iop
18kA
Draft Dipole Parameters Cold Bore
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12. Coupling Loss Assessment
Test results of 3x3x4x4 CICC (0.81 mm Nb3Sn strand, vf 37 %):
n  3 ms (Bdc = 10 T, B = ±0.35 T) in frequency range 1 – 10 Hz
and with transport current 12 kA
 Losses  60 mJ/cc (cable volume) at 8 Hz
Measured values below the prediction (small effective n?)
Extrapolation to dipole cable: Q  2.5 J/m conductor Additional losses due to lower vf only during the first few cycles
No representative data for low frequencies (ramping up, …)
Flux jumps: No experience in CICC  Operating conditions and scenarios of existing dipole?
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13. 25/02/2019
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14. Graded Dipole
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15. Graded Dipole Cross section With structures
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16. 25/02/2019
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17. 25/02/2019
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18. Engineering Design Assembly Drawings
Electric,Magnetic, Temperature,Strain and Flow analysis
Structural Assessment
Manufacturing Cycle
Facility Interface
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19. Dipole Manufacturing Contract
Supplier has Manufacturing Responsibility
EFDA has Performance Responsibility
Possibly 2 Contracts(Cable-Dipole)
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20. Facility Preparation Cryostat & Cooling Power Supply & Protection
Data acquisition System
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21. Strategy of EFDA for ITER
The Dipole Facility will be used for QA of the EU Contribution
It will be offered for use of the ITER partners
25/02/2019
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22. Relevance for HEP
High performance strand operational experience (e.g.flux jumps)
Dipole operational Experience at relevant Magnetic Field and Bore
Validation of Design Tools and Manufacturing Procedures
Facility for conductor Testing
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23. Will it happen?
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