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Materials and Material R&D in Support of ILC

Materials and Material R&D in Support of ILC. Summary[1]. ACD Choice : fine grain (standard) niobium with RRR > 300 Well characterized properties Existing specifications Readily available Used successfully in many cavities with high performance BCD Choices:

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Materials and Material R&D in Support of ILC

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  1. Materials andMaterial R&D in Support of ILC 2nd ILC Workshop Snowmass, Aug. 13 – 27, 2005

  2. Summary[1] • ACD Choice:fine grain (standard) niobium with RRR>300 • Well characterized properties • Existing specifications • Readily available • Used successfully in many cavities with high performance • BCD Choices: • Large grain/Single Crystal Niobium with RRR> 300 • Potential advantages: similar performance reduced costs: > 250 Mill $ “streamlined” procedures,e.g. BCP vs EP easier QA Initial on SC cavities results are encouraging, verification on MC cavities • Nb/Cu clad material with RRR> 300 • Material successfully developed, high performance demonstrated on SC • Further developments necessary for multi-cell cavities(> 2 years) • Problem areas: material still quenches, Q-degradation,cooldown,technology for multi-cell cavities 2nd ILC Workshop Snowmass, Aug. 13 – 27, 2005

  3. Nb Discs LL cavity 2.3GHz Large Grain/Single Crystal Niobium[3] Epeak/Eacc = 2.072 Hpeak/Eacc = 3.56 mT/MV/m 2nd ILC Workshop Snowmass, Aug. 13 – 27, 2005

  4. Surface Roughness (1) BCP provides very smooth surfaces as measured by A.Wu, Jlab RMS: 1274 nm fine grain bcp 53 nm after ~ 35 micron, single Crys 27 nm after ~ 80 micron,single Crys 251 nm fine grain ep 2nd ILC Workshop Snowmass, Aug. 13 – 27, 2005

  5. Summary[2] Material R&D: • What is the limiting magnetic field for Nb? • Analysis of existing data by K.Saito: Hcrit~ 180 mT • Verification with special cavities, e.g single crystal TE011 • Influence of “defects”,grain boundaries, flux penetration • What is the physics of the “Q-drop”? • Proof of “Hot Spot” model [A.Gurevich, SRF2005] with T-maping and surface investigation • Proof of oxygen diffusion model [G.Ciovati,SRF2005] • Effect of flux penetration • Frequency dependence • How does the surface condition/oxidation influence rf performance( Q-slope, residual resistance,BD field)? • Atom probe tomography of Nb subjected to different surface treatment • Special devices, e.g TE011 endplate/coaxial cavities, different surface treatments • T-mapping 2nd ILC Workshop Snowmass, Aug. 13 – 27, 2005

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