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High- Tc Superconducting Link Status of Task 7.5 FP7 Meeting at LASA-Milano

High- Tc Superconducting Link Status of Task 7.5 FP7 Meeting at LASA-Milano. Ballarino , CERN for the Task 7.5 Collaboration CERN, Bruker , Columbus, University of Southampton LASA , 18-09-2012. Outline. Task description C able concept Progress since last meeting (April 2012):

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High- Tc Superconducting Link Status of Task 7.5 FP7 Meeting at LASA-Milano

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  1. High-Tc Superconducting LinkStatus of Task 7.5FP7 Meeting at LASA-Milano Ballarino, CERN for the Task 7.5 Collaboration CERN, Bruker, Columbus, University of Southampton LASA, 18-09-2012

  2. Outline • Task description • Cable concept • Progress since last meeting (April 2012): • Cabling machines • Test station • Status of activity vs final deliverable • Conclusions

  3. Task 7.5: High-Tc link Deliverable of Task 5 - as described in the Eucard Grant Agreement: Superconducting link, 20 m long, containing 48 HTS cables rated at 600 A - DC .The Task includes design and assembly activities – but not the test of the final prototype The final application for LHC (P7) consists of two superconducting links, each about 500 m long, with the same configuration of the prototype CERN will test the 20 m long prototype in nominal operating conditions

  4. Cable concept Elaboration of a cable concept that enables the use of pre-reacted superconductors available in the form of tape: MgB2, YBCO and BSCCO 2223 The HTS cable design adopted for power transmission lines appeared not to be suitable for this specific application - few tapes and many cables in the same cryogenic envelope

  5. Cable Concept Three HTS tapes per cable interleaved withcopper strips 4 mm 1 mm + 600 A - 600 A

  6. Cable/Link Concept (2/2) 24 × 2 × 600 A • 2 kg/m • 200 mHTS/mcable Link: multi-cable assembly in cryostat Multi-cable assembly

  7. Prototype twisted-pair cables characterization(CERN and SOTON) Type-5: MgB2 Type-3: Y-123 Type-2: Bi-2223 Type-1: Bi-2223 2×4.4 kA ! • Measurement performed on • twisted-pair cables made • from different conductors • No cabling degradation • observed (< 2 %) • Good homogeneity of Ic of • cables in the same in the • same twisted pair ( 2 %) Self-field, Length of cables = 2 m NB The Ic in the plot refers to one single cable of the twisted pair unit

  8. Cabling machine (1/2) For the controlled assembly of long cables a dedicated cabling machine has been designed, assembled and fully commissioned at CERN

  9. Cabling machine (2/2) Rotating machine for the twisting of insulated cables Design and assembly completed. To be commissioned in October 2012.

  10. Test station

  11. Test Station – SM 18 CERN laboratory Refrigerator: 6 kW @ 4.5 K (18 kW for test of LHC magnets) 25 000 LHe Dewar

  12. Test Station @ CERN: Conceptual Design RT Cryostatwith current leads Cryostatwith superconducting cables

  13. Test Station @ CERN: Conceptual Design RT LHe Instrumentation DAQ Quench Protection GHe 4.5 K Tv m ≤ 10 g/s 5 K ≤ Tv ≤ 70 K GHe LHe, 4.5 K Vacuum Insulation

  14. Test Station @ CERN

  15. Test Station @ CERN

  16. Test station at CERN • The two cryostats are fully assembled • The cryostat with the leads has beencommissioned – pressure and leak • tested, cooled-down to nominal conditions, operated at some 3.5 kA and • warmed up • The cryostat of the superconducting link was successfully leak tested last • week, and it will be pressure tested this week • The connection of the two cryostats is planned to take place this month. • A first cool-down, with a 20 m long twisted pair YBCO cable already • integrated the in cryostat of the superconducting link, is planned to take • place in October 2012

  17. Status of activity vs final deliverable • The 20 m long semi-flexible cryostat with a supporting system and • purpose-built terminations, is available today at CERN • A 20 m long 48 HTS cable assembly can be ready by end 2012 – when • also the rotating cabling machine will have been commissioned • This two components make the superconducting link which is the • deliverable of the Task 7.5 • In addition: • By the end of the year, the test station will have been fully commissioned • and 20 m long cables will have been tested in He gas in a variable • temperature range. The test of a 20 m long prototype will follow

  18. Is the Task 7.5 on schedule ? Yes Assembly of prototype link: planned to be ready by end 2012.

  19. Conclusions • A new cable concept has been proposed. Validation of the proposed • twisted-pair concept was done with the assembly and characterization of • short prototype MgB2, YBCO and BSCCO 2223 cables • Two cabling machines have been designed and constructed for the • controlled cabling of the 20 m long HTS twisted-pair cables • A new test station has been constructed at CERN for the test of the 20 m • long prototype link • The task is on schedule – a full prototype is planned to be available by end • 2012. The test in nominal operating conditions will follow. • Single twisted-pair cables, 20 m long, will be measured this year

  20. Thanks for your attention !

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