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IEA ExCo Meeting HTS Reinhard Dietrich Lausanne, May 2013

IEA ExCo Meeting HTS Reinhard Dietrich Lausanne, May 2013. Nb3Sn Bronze Strand for ITER TF coils. Bruker EAS supplies ≈ 38 t of Cr coated Nb3Sn strand for ITER TF coils Production Ramp Up in 2010 Production unit ≈ 100 kg Strand characteristics Bronze route Nb3Sn strand, Ø = 0.82 mm

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IEA ExCo Meeting HTS Reinhard Dietrich Lausanne, May 2013

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  1. IEA ExCo MeetingHTSReinhard DietrichLausanne, May 2013

  2. Nb3Sn Bronze Strand forITER TF coils Bruker EAS supplies ≈ 38 t of Cr coated Nb3Sn strand for ITER TF coils Production Ramp Up in 2010 Production unit ≈ 100 kg Strand characteristics Bronze route Nb3Sn strand, Ø = 0.82 mm 8305 Filaments, Ø ≈ 3 µm ≈ 1.5 µm Chromium Coating Cu / non Cu ratio = 1 Ic specification 190 A at 4.22 K, 12 T, n > 20 Hysteresis Loss < 500 mJ/cm³ (4.22 K, ± 3 T RRR = 100 2

  3. Nb3Sn Bronze Strand forITER TF coils Current Status with approx. 2/3 of the amount finished: > 21000 m average yield per billet 100 kg net billet mass (standard production unit) 1.4 breakages per billet > 250 Billets fully characterized > 300 Billets manufactured (wire drawing completed) 3

  4. Nb3Sn Bronze Strand forITER TF coils some statistics on performance data: Ic Very small variations in Ic Indicating well controlled fabrication and starting material properties 4

  5. YBCO coated conductors: BHTS production chain Ic measure- ments Metallization O2-Loading Cu plating Polishing, Cleaning ABAD YSZ buffer HR-PLD CeO2 YBCO Presently:batch/ RtR RtR batch/helix RtR RtR RtR RtR 250m >1000m 250m >1000m >1000m >1000m >1000m Next step: RtR >1000m RtR/batch >250m 180µm 5

  6. MB-PLD confidential 165m long test multi-tape on MB-PLD tubular carrier (after film deposition). Local drops of Ic in 40m long tape (Jan 30, 2013) >100 m long Coated Conductors (Ic at 77K, SF)

  7. confidentialProgress in 2G tape technology at Bruker HTS (Apr 2013)A. 230m long substrate stainless steel tapes with substantially reduced defects after polished and cleaned are achieved.B. 200m long ABAD coated tape is manufactured in machines This is the longest and the highest quality (9.5-10.2° texture) tape ever produced in Europe.C. PLD: regime of PLD designed for coating of 250+ m long tapes was established and verified. 120+ m long CC were repeatedly processed.

  8. Former status in 2010 on critical current in Cu plated tapes Highest Ic achieved in 6m long tape: 500 A/cm-w at 77K, SF Well-reproducible Ic: 220 A/cm-w at 77K, SF Performance in high fields (former results) Highest result achieved: Ic = 1925 A in 4 mm wide tape at B = 18 T, 4.2 K in parallel field, in 4mm-wide tape

  9. Machinery • Turning lathe with polishing head • RTR equipped ultrasonic bath

  10. Quality Control • Gloss measurement • Roughness measurement • Visual inspection in a dark room • 100% surface inspection • Light microscopy • Laser scanning microscopy

  11. Quality Control • Gloss measurement • Roughness measurement • Visual inspection in a dark room • 100% surface inspection • Light microscopy • Laser scanning microscopy

  12. Quality Control • Gloss measurement • Roughness measurement • Visual inspection in a dark room • 100% surface inspection • Light microscopy • Laser scanning microscopy

  13. Issues • Surfacecleanness • Rawsubstrate vs. Polishedsubstrate

  14. Public Statement on iSFCL … at one program which some of you who may have followed that is our fault current limiter or superconducting fault current limiter program and we decided not to pursue that going forward in 2013 because the commercialization opportunities were just too far out … Frank Laukien

  15. Sleeping Beauty

  16. HTS… … to be continued…

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