Residual resistance data from cavity production projects at Jefferson Lab

Gianluigi Ciovati; Rongli Geng; John Mammosser; Jeffrey W. Saunders

doi:10.1109/TASC.2010.2087305

Residual resistance data from cavity production projects at Jefferson Lab

Gianluigi Ciovati, Rongli Geng, John Mammosser, Jeffrey W. Saunders

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Abstract

A fundamental limitation towards achieving high quality factors in superconducting radio-frequency cavities is the so-called residual resistance. Understanding and controlling the residual resistance has important implications towards improving the efficiency and reduce the operating cost of continuous wave superconducting linear accelerators. In this contribution we will report on the residual resistance values obtained from measurements of the quality factor of a large set of cavities, with resonant frequency between 805 MHz and 1.5 GHz, all of them processed and tested at Jefferson Lab. Surface treatments included both buffered chemical polishing and electropolishing. The results indicate an approximate value of the residual resistance of about 7-10 nΩ.

Original language	English
Article number	5643110
Pages (from-to)	1914-1917
Number of pages	4
Journal	IEEE Transactions on Applied Superconductivity
Volume	21
Issue number	3 PART 2
DOIs	https://doi.org/10.1109/TASC.2010.2087305
State	Published - Jun 2011

Funding

Manuscript received August 02, 2010; accepted October 08, 2010. Date of publication November 22, 2010; date of current version May 27, 2011. This manuscript has been authored by Jefferson Science Associates, LLC under US DOE Contract DE-AC05-06OR23177.

Funders	Funder number
U.S. Department of Energy	DE-AC05-06OR23177

Keywords

Niobium
Superconducting accelerator cavities
Superconducting devices

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10.1109/TASC.2010.2087305

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abstract = "A fundamental limitation towards achieving high quality factors in superconducting radio-frequency cavities is the so-called residual resistance. Understanding and controlling the residual resistance has important implications towards improving the efficiency and reduce the operating cost of continuous wave superconducting linear accelerators. In this contribution we will report on the residual resistance values obtained from measurements of the quality factor of a large set of cavities, with resonant frequency between 805 MHz and 1.5 GHz, all of them processed and tested at Jefferson Lab. Surface treatments included both buffered chemical polishing and electropolishing. The results indicate an approximate value of the residual resistance of about 7-10 nΩ.",

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Residual resistance data from cavity production projects at Jefferson Lab

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