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HTS Coated Conductors for FCC beam screen

This proposal aims to develop and study High-Temperature Superconducting (HTS) Coated Conductors for the Future Circular Collider (FCC) beam screen, with a focus on their performance at high magnetic fields and intermediate temperatures. The project includes material selection, RF impedance measurements, mechanical properties, radiation activation, vacuum compatibility, and the design of a proof-of-concept device.

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HTS Coated Conductors for FCC beam screen

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  1. HTSCC-Beam Screen Proposal HTS Coated Conductors for FCC beam screen Partners: ICMAB-CSIC : Superconducting materials group ALBA: Synchrotron light source IFAE : High Energy Physics Institute CERN

  2. What is a Coated Conductors (CC) ? CC is a long length (km) epitaxial YBCO films on a flexible metallic substrate capable of carrying very large currents Present commercial values are 400 A/cm-width @77 K and 750 A/cm-w @4.2 K for 20 T Cu shunt (100m) Ag protection (0.5-1 m) YBa2Cu3O7 (1-2  m) (oxides non-conductive) Buffers (0.5-1 m) Metallicsubstrate (50-100 m) (Stainless steel or hastealloy)

  3. YBa2Cu3O7 (YBCO) Coated Conductor • Proven technology and performance • Industrial availability in km-length pieces • Extremely high irreversibility field • Grain-boundary issues solved by CC technology • Environmentally friendly with no toxic elements • Critical current anisotropy much reduced by nanocomposites • Many device prototypes achieved with demonstrated mechanical and handling performance  150 times higher current density at 77 K than Cu and able to generate > 20 T at 4.2 K 1000 A equivalents: Cu and HTS

  4. High critical current density of YBCO YBCO (@4.2K, 20T) Fp,max = 1000 GN/m3 (1500 GN/m3 in labscale) YBCO [010] BaZrO3 Nb3Sn (@4.2K, 15T) Fp,max= 15 GN/m3 c Nb-Ti (@4.2K, 5T) Fp,max= 16.5 GN/m3 YBCO c [010] BaZrO3

  5. Coated conductors are ready to be used with high performance Ic= 773 A /cm-w @ 31 T Ic= 1500 A /cm-w @ 16 T

  6. Several companies develop CC with different architectures There is capacity to adapt to specific applications EUROPE USA JAPAN KOREA CHINA

  7. FCC beam screens needs • (unprecedented beam power) • Operation at 50 K to reduce cryogenic power consumption • Low impedance coating for reduction of beam-induced RF image currents • Absorption of high synchrotron radiation load • High vacuum • Magnetic field background at 16 T • Induced peak currents of 25 A FCC chamber design LHC beam screen Proposal: Cover the chamber with pre-fabricated CC M. Benedikt, communication

  8. General scope of the proposal • R&D project to generate knowledge on the performance of HTS CC irradiated by RF and synchrotron light at high magnetic fields and intermediate temperatures (40-60 K) based on its expected low surface impedance and high superconducting properties • Find an adequate ensemble of the CC to the FCC anti-chamber design to undertake a feasibility study in a small proof-of-concept model device

  9. ProposedWorkPackages CCFCC-Screen :36 M project • WP1: Materials requirements, characterization and selection • WP-leader:ICMAB  M0-M36 • WP2: Development of RF surface impedance measuring systems • WP-leader: ALBA  M0-M36 • WP3: Mechanical properties of CC and development of a welding technology for the beam screen coating assembly • WP-leader: IFAE  M0-M36 • WP4:Evaluation of Secondary Electron Yield and radiation activation. WP-leader:CERN  M12-M36 • WP5: Evaluation of vacuum compatibility and thermo- electromagnetic simulations • WP-leader: ALBA  M12-M24 • WP7: Scaling study and technology transfer analysis • WP-leader: ICMAB  M33-M36 • WP6:Design, construction and test of a proof-of-concept device • WP-leader: IFAE  M24-M36

  10. WP1 : Materials requirements, characterization and selection WP leader: ICMAB

  11. Basic Superconducting characterization and protection layer development Ion Milling/Sputtering/ E-Beam from TSST in clean room environment Quantum Design PPMS System Wet etching Lab in clean room environment Equipped with a 9 T superconducting magnet Variable temperature Equipped with a rotor for Tc, Jc(H,T,), Hirr(T) determination To be used for dry etching and deposition

  12. WP2: Development of RF measuring systemsWP leader: ALBA

  13. Possible RF technologies for 2.6 cm bore 9 T magnet at ICMAB Radio-frequency impedance measurements using a tunnel-diode oscillator technique Coax+Co-Planar Waveguide >100 MHz Two magnetic field orientations available Coax + coil mpedance measurements using a H. Srikanth, et al, Rev. Sci. Instruments 70, 3097 (1999) Integration in a 9 T PPMS from Quantum Design family Integration with cryostats in the PPMS family 5 GHz >2GHz integration in a SQUID Magnetomer from Quantum Design family By J. Tejada group - U. Barcelona By Quantum Design and NanoSC Instruments AB -www.nanosc.se • Implementation technology • - Signal acquisition • Signal /noise ratio • … This is a high risky strategy

  14. Possible RF technologies for ALBA setup Stripline Resonator Parallel plate Resonator www.umwlab.com/small.php Ferroelectric film Transmission line cavity 6.5 GHz The CC tape could be patterned according R.C. Taber, Rev.Sci.Inst. 61, 2200 (1990)

  15. Possible RF technologies for ALBA setup Co-planar Waveguide Resonator Coplanar waveguide resonators for circuit quantum electrodynamics M Göppl, ETH Zurich, JAP 104, 113904 (2008) 4.7 GHz resonator

  16. Possible RF technologies for ALBA setup Rutile Resonator

  17. Possible RF technologies for ALBA setup by Roberto Kersevan Location at BL34

  18. WP3: Mechanical properties of CC and development of a welding technology for the beam screen coating assembly WP leader: IFAE

  19. Welding and assembling technology 1.- Use wide CC and solder a single piece on the steel plate before deformation CC 2.- Shape the ensemble CC CC CC Schematic drawing not at scale 3.- Ensemble the two site of the chamber The two inner pieces of the chamber can be covered by the CC before assembling Simulations of 1m YBCO layer have shown the benefit of superconducting surface impedance reduction at RF S. Calatroni, IEEETransSuprcond. (submit.)

  20. Mechanical testing Laboratory • Bending radius tests • Strain-stress tests at 77 K with in-situ I(V) curves: • -strain gauges system • -max. stress load 2500 N • -Minimum displacement 5 m • -Automatized • Upgrade: • -Temperature dependence with He-gas flow cryostat with spring walls • -Digital photocorrelation (speed and homogeneity) • Soft solder roll-welding machine: solder Material 1 Material 2 Synchronized hot roll (200 ºC) cooler Tension control Traction control

  21. WP4: Evaluation of Secondary Electron Yield and radiation activationWP leader: CERN WP5: Evaluation of vacuum compatibility and thermo- electromagnetic simulations WP leader ALBA

  22. WP6: Design, construction and test of a proof-of-concept device WP leader: IFAE

  23. WP7: Scaling study and technology transfer analysis WP leader: ICMAB

  24. IFAE & ALBA & ICMAB: Complementary expertise just a few kilometers apart, which facilitates and strengthens a close collaboration ICMAB IFAE ALBA 200 m

  25. CONCLUSIONS Main Expected results from the R&D Proposal • An evaluation and true diagnoses of the performance of HTS CC in RF radiation in conditions close to the beam screen needs for FCC • Establish the requirements for the CC tapes (substrate, thickness, dimensions, protection layer, mechanical properties, superconducting properties …) to be used for this application • Propose a welding technology based on a proof-of–concept device enabling to undertake a feasibility study for the design of a FCC chamber based on HTS CC • Set up a Reference Installation for surface impedance studies

  26. Thanks

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