Progress on MgB2 at CERN
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The document discusses the progress on the MGB2 project at CERN, focusing on the powering of superconducting magnet circuits for the Hi-Luminosity upgrade of the LHC. It highlights the use of long-distance superconducting links to enhance flexibility in power converter locations, emphasizing the specifications and capabilities of the superconducting wires and cables used. Additionally, it details the planned installation of superconducting links and their operational performance in various test scenarios.
Progress on MgB2 at CERN
- 1. Progress on MgB2 at CERN A. Ballarino, CERN A. Ballarino, B. Bordini, S. Giannelli, J. Hurte, A. Jacquemod and L. Rossi April 9th , 2014
- 2. -Electrical transmission: powering of superconducting magnet circuits via remote distance The project: Hi-Luminosity upgrade of LHC Powering of new Hi-Luminosity magnets Powering of existing LHC magnet circuits Objective: provide flexibility in the location of the power converters and of the cryostats containing the current the leads in cases where space is limited and the radiation environment harsh. Use long distance superconducting links between power converters and magnets Why MgB2 for the LHC Hi-Luminosity Upgrade A. Ballarino, CERN
- 3. Itot∼ 3 MA 48 Cryostats 1200 HTS Leads Powering the LHC circuits A. Ballarino, CERN
- 4. Powering the Hi-Luminosity LHC circuits
- 5. P1 P6 P4 P2 P8 P3 P5 P7 P1 P6P4 P2 P8 P3 P5 P7 Betatron Cleaning Collimators CMS ATLAS Where in the LHC ? A. Ballarino, CERN
- 6. Superconducting Links Superconductor operating at higher temperature: simplified (He gas) and relaxed (temperature margin) cryogenic cooling Tunnel Surface 1.9 K ∼ 5 K T ≤ 25 K Maximum operating temperature of the cable = 25 K He gas cooling Operation in self-field (B <1 T) A. Ballarino, CERN
- 7. Superconducting Links Specification A. Ballarino, CERN -Total number of superconducting links planned to be installed in the LHC: 8 Lenght of superconducting links: 300 m to 500 m Multi-cable assembly Cable current rating: up to 20 kA Number of cables inside the link: up to 50 Total current capability: up to 150 kA Total length of superconductor > 1000 km (7 tons)
- 8. MgB2 wire specification Ic(20 K, 0.5 T) > 500 A Ic(25 K, 0.5 T) > 400 A Ic (30 K, 0.06 T) > 300 A Jc,eng(20 K, 0.5 T) > 630 A/mm2 Jc,eng(25 K, 0.5 T) > 500 A/mm2 Jc,eng(30 K, 0.06 T) > 380 A/mm2 n-value (25 K, 0.5 T) > 30 Φ of strand < 1 mm Copper stabilizer ≥ 12 % RRR Copper stabilizer* > 80 Bending radius* < 100 mm Critical tensile strain (RT)* > 0.3 % Unit length 1000 m A. Ballarino, CERN
- 9. MgB2 wire 3.6×0.67 mm2 1.6×1.6 mm2 1.1×1.1 mm2 Ni Matrix 12 MgB2 filaments Cu core – Fe barrier ff ∼ 14 % Monel Matrix 30 MgB2 filaments Nb + Ni barrier ff ∼ 10.4 %- 18 % Φ = 0.98 mm Φ = 0.85 mm A. Ballarino, CERN Wire produced at Columbus Superconductors, Genova
- 10. MgB2 wire 2012 20132008Year + uniform Ic + ε ≥ 0.3 % + RB ∼ 100 mm A. Ballarino, CERN
- 11. H ∼ 4 m L = 20 m SC Link Test Station @ CERN A. Ballarino, CERN
- 12. MgB2 cables
- 13. 20 kA Six cables, Φ = 19.5 mm Concentric ± 3 kA Seven cables, Φ = 8.4 mm 0.4 kA Four cables 0.12 kA Eighteen cables Φext ∼ 65 mm 18 MgB2 wires Φ = 6.5 mm Cu MgB2 , Φ = 0.85 mm Hi-current MgB2 cables – Ex LHC P1 and P5 A. Ballarino, CERN
- 14. Mass ∼ 11 kg/m (880 kg for ∆H=80 m) Itot= 150 kA ∆H=80 m ∆L ∼24 cm RB∼1.5 m Semi-flexible cryostat external diameter = 220 mm Hi-current MgB2 cables – Ex LHC P1 and P5 A. Ballarino, CERN
- 15. 18 MgB2 wires Φwire = 0.98 mm ΦCable = 6.5 mm Tw = 400 mm Ltot=2×10 m LHe (L=2 m) GHe (L=10 m) ∆T < 1 K + - 5000 A Φ = 6.5 mm 10507 A Measurement on MgB2 cables, 2×10 m LHC Nb-Ti cable 6 kA Operated at T<6 K 3 × 6 kA A. Ballarino, CERN
- 16. Measurements on MgB2 cables, 2×20 m Reached 20 kA at 24 K in two cables, each 20 m long, operated at CERN at 24 K in forced flow of helium gas (20th of February 2014) Record in current in MgB2 cables operated at higher temperature A. Ballarino, CERN
- 17. 2013 202320182017201620152014 SC Links at LHC P7 SC Links at LHC P1 and P5 Test of horizontal lines Test of vertical lines 20 m 60 m Series P7 Series P1 and P5 Conductor for series Timeline A. Ballarino, CERN
- 18. Thanks for your attention !