Dipole Project for Fusion Ettore Salpietro 25/02/2019 CERN-ES

Scope ITER Conductors R&D & QA Gain Confidence on Operability of Coils with Advanced Strands 25/02/2019 CERN-ES

Planning Project approved by supervisory board Concept Selection Engineering Design Contract for dipole manufacturing to be signed in 2005 Facility Operational in 2008 25/02/2019 CERN-ES

Gantt View 25/02/2019 CERN-ES

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 25/02/2019 CERN-ES

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 25/02/2019 CERN-ES

ITER Scenario 2 25/02/2019 CERN-ES

ITER Plasma Disruption 25/02/2019 CERN-ES

25/02/2019 CERN-ES Advanced Strand 2000

Graded dipole optimization 25/02/2019 CERN-ES

Draft Dipole Parameters Cold Bore B0 = 12.75 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 25/02/2019 CERN-ES

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? 25/02/2019 CERN-ES

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Graded Dipole 25/02/2019 CERN-ES

Graded Dipole Cross section With structures 25/02/2019 CERN-ES

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Engineering Design Assembly Drawings Electric,Magnetic, Temperature,Strain and Flow analysis Structural Assessment Manufacturing Cycle Facility Interface 25/02/2019 CERN-ES

Dipole Manufacturing Contract Supplier has Manufacturing Responsibility EFDA has Performance Responsibility Possibly 2 Contracts(Cable-Dipole) 25/02/2019 CERN-ES

Facility Preparation Cryostat & Cooling Power Supply & Protection Data acquisition System 25/02/2019 CERN-ES

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 CERN-ES

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 25/02/2019 CERN-ES

Will it happen? 25/02/2019 CERN-ES