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Advanced Magnetic Materials for Particle Acceleration: Amorphous and Nanocrystalline Alloys

This paper explores the latest advancements in magnetic materials suitable for particle acceleration, focusing on amorphous and nanocrystalline alloys. It compares historical and current materials like ferrites and Fe-based alloys, highlighting their low Q-factor, high operating flux densities, and capability to suppress coupled bunch instabilities. Large core production techniques and the importance of controlled winding tension for optimal performance are discussed, with a recommendation for broader availability of specialized core materials to meet specific cavity requirements in particle accelerators.

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Advanced Magnetic Materials for Particle Acceleration: Amorphous and Nanocrystalline Alloys

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  1. MAGNETIC MATERIALS FOR PARTICLE ACCELERATION R. Hasegawa Metglas, Inc., Conway, SC, USA K. Ogura and T. Yoshida Hitachi Metals, Ltd., Tottori, Japan RPIA 2006, Tsukuba, Japan 07-10 March 2006

  2. OVERVIEW • Introduction • Amorphous Alloy Inductors • Nanocrystalline Alloy Inductors • Production of Large Size Cores • Conclusion

  3. INTRODUCTION • Materials Considered (past & present): • Ferrites • Fe-based Nanocrystalline Alloys • Fe-, Fe-Ni- and Co-based Amorphous Alloys • Main Features: • Low Q • High Operating Flux Densities • High Accelerating Gradient Operations • Suppression of Coupled Bunch Instability Wider Availability of Core Materials for Specific Cavity Requirements

  4. HISTORICAL FT3M FT3L Fe-AM FeNi-AM Y. Tanabe, M. Fujieda, Y. Mori, H. Nakayama, C. Ohmori, K.Saito, Y. Sato, T. Uesugi, M. Yamamoto, T. Yan, E. Ezura, T. Takagi and M. Yoshii, KEK Preprint 98-77 (June 1998)

  5. Co-based Amorphous Alloy

  6. µQf Product Comparison FT3L and Fe-AM : data of Tanabe et al.

  7. Nanocrystalline Alloy

  8. Nanocrystalline Alloy

  9. Nanocrystalline Alloy (FT3L-13µm) Q

  10. Previous Winding Tension Pattern A Pattern B Diameter of Wound Core LARGE CORE PRODUCTION

  11. µQf Variability - Core Winding Tension

  12. CONCLUSION • Both amorphous and nanocrystalline alloys were • heat-treated with a magnetic field applied along • cores’ axis direction. • µQf > 7 GHz at 1 MHz achieved in amorphous Co- • based alloy and Fe-based nanocrystalline alloy • Q ~ 4 (Co-based amorphous alloy) • Q ~ 1 (Fe-based nanocrystalline alloy) • µ ~ 2000 (Co-based amorphous alloy) • µ ~ 5000 (Fe-based amorphous alloy) • Controlled core winding tension is necessary to • reduce performance variability across cores’ build. • PROVIDE WIDER AVAILABILITY OF INDUCTOR CORE • MATERIAL FOR PARTICLE ACCELERATION

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