Superconducting radio-frequency cavities made from medium and low-purity niobium ingots

Ciovati, Gianluigi; Dhakal, Pashupati; Myneni, Ganapati R.

doi:10.1088/0953-2048/29/6/064002

Superconducting radio-frequency cavities made from medium and low-purity niobium ingots

Journal Article · Thu Apr 07 04:00:00 EDT 2016 · Superconductor Science and Technology

DOI:https://doi.org/10.1088/0953-2048/29/6/064002· OSTI ID:1256296

Ciovati, Gianluigi ^[1]; Dhakal, Pashupati ^[1]; Myneni, Ganapati R. ^[1]

Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Superconducting radio-frequency cavities made of ingot niobium with residual resistivity ratio (RRR) greater than 250 have proven to have similar or better performance than fine-grain Nb cavities of the same purity, after standard processing. The high purity requirement contributes to the high cost of the material. As superconducting accelerators operating in continuous-wave typically require cavities to operate at moderate accelerating gradients, using lower purity material could be advantageous not only to reduce cost but also to achieve higher Q₀-values. In this contribution we present the results from cryogenic RF tests of 1.3–1.5 GHz single-cell cavities made of ingot Nb of medium (RRR = 100–150) and low (RRR = 60) purity from different suppliers. Cavities made of medium-purity ingots routinely achieved peak surface magnetic field values greater than 70 mT with an average Q₀-value of 2 × 10¹⁰ at 2 K after standard processing treatments. As a result, the performances of cavities made of low-purity ingots were affected by significant pitting of the surface after chemical etching.

View Accepted Manuscript (DOE)

Research Organization:: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

Grant/Contract Number:: AC05-06OR23177

OSTI ID:: 1256296

Alternate ID(s):: OSTI ID: 22531835
OSTI ID: 1246474

Report Number(s):: JLAB-ACC--16-2244; DOE/OR/23177--3812

Journal Information:: Superconductor Science and Technology, Journal Name: Superconductor Science and Technology Journal Issue: 6 Vol. 29; ISSN 0953-2048

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Cited By (5)

Flux expulsion in niobium superconducting radio-frequency cavities of different purity and essential contributions to the flux sensitivity Dhakal, Pashupati; Ciovati, Gianluigi; Gurevich, Alex arXiv https://doi.org/10.48550/arxiv.1906.04163	text	January 2019
Theory of RF superconductivity for resonant cavities Gurevich, Alex Superconductor Science and Technology, Vol. 30, Issue 3 https://doi.org/10.1088/1361-6668/30/3/034004	journal	January 2017
Field-dependent nonlinear surface resistance and its optimization by surface nanostructuring in superconductors Kubo, Takayuki; Gurevich, Alex Physical Review B, Vol. 100, Issue 6 https://doi.org/10.1103/physrevb.100.064522	journal	August 2019
Nonlinear dynamics and dissipation of a curvilinear vortex driven by a strong time-dependent Meissner current Pathirana, W. P. M. R.; Gurevich, A. Physical Review B, Vol. 101, Issue 6 https://doi.org/10.1103/physrevb.101.064504	journal	February 2020
Nonlinear Dynamics and Dissipation of a Curvilinear Vortex Driven by a Strong Time-Dependent Meissner Current Pathirana, W. P. M. R.; Gurevich, A. arXiv https://doi.org/10.48550/arxiv.2001.08836	text	January 2020

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