Mirror smooth superconducting RF cavities by mechanical polishing with minimal acid use

Journal Article · Tue Feb 01 04:00:00 EST 2011 · TBD

OSTI ID:1967992

Cooper, C. A. ^[1]; Cooley, L. D. ^[1]

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1. Fermilab

A new mechanical technique for polishing the inside surface of niobium superconducting RF (SRF) cavities has been developed. Mirror-like finishes, the smoothest observed in cavities so far, were produced after fine polishing, with < 15 nm RMS roughness over 1 mm2 scan area. This is an order of magnitude less than the typical roughness produced by electropolishing. The processing equipment has advantages of modest installed and operating costs, simple associated technology, and no large quantities of acutely toxic chemicals or special handling procedures. Cavity quality factors above 10 10 were maintained well above the 35 MV m-1 benchmark for electropolished cavities, and this was achieved with an intermediate finish not as smooth as the final polish. Repair of a weld defect, which is intrinsic to this process, was also demonstrated. These transformational aspects could enable a new SRF cavity processing paradigm for future large scale particle accelerators such as the International Linear Collider.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1967992
• Report Number(s): FERMILAB-PUB-11-930-TD; oai:inspirehep.net:891426
• Journal Information: TBD, Journal Name: TBD
• Country of Publication: United States
• Language: English

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