1 / 5

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:

tamah
Download Presentation

Materials and Material R&D in Support of ILC

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related