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

Journal Article · · Superconductor Science and Technology
 [1];  [1];  [1]
  1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
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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.

Research Organization:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
AC05-06OR23177; CRADA JSA 2004S002
OSTI ID:
1256296
Alternate ID(s):
OSTI ID: 1246474
Report Number(s):
JLAB-ACC-16-2244; DOE/OR/23177-3812
Journal Information:
Superconductor Science and Technology, Vol. 29, Issue 6; ISSN 0953-2048
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 21 works
Citation information provided by
Web of Science

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Cited By (4)

Theory of RF superconductivity for resonant cavities journal January 2017
Nonlinear dynamics and dissipation of a curvilinear vortex driven by a strong time-dependent Meissner current journal February 2020
Nonlinear Dynamics and Dissipation of a Curvilinear Vortex Driven by a Strong Time-Dependent Meissner Current text January 2020
Flux expulsion in niobium superconducting radio-frequency cavities of different purity and essential contributions to the flux sensitivity text January 2019

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
niobium
superconducting cavities
radio-frequency devices