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

Abstract

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 Q 0-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 Q 0-value of 2 × 10 10 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.

Authors:
 [1];  [1];  [1]
  1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1256296
Alternate Identifier(s):
OSTI ID: 1246474
Report Number(s):
JLAB-ACC-16-2244; DOE/OR/23177-3812
Journal ID: ISSN 0953-2048
Grant/Contract Number:  
AC05-06OR23177; CRADA JSA 2004S002
Resource Type:
Accepted Manuscript
Journal Name:
Superconductor Science and Technology
Additional Journal Information:
Journal Volume: 29; Journal Issue: 6; Journal ID: ISSN 0953-2048
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; niobium; superconducting cavities; radio-frequency devices

Citation Formats

Ciovati, Gianluigi, Dhakal, Pashupati, and Myneni, Ganapati R. Superconducting radio-frequency cavities made from medium and low-purity niobium ingots. United States: N. p., 2016. Web. doi:10.1088/0953-2048/29/6/064002.
Ciovati, Gianluigi, Dhakal, Pashupati, & Myneni, Ganapati R. Superconducting radio-frequency cavities made from medium and low-purity niobium ingots. United States. doi:10.1088/0953-2048/29/6/064002.
Ciovati, Gianluigi, Dhakal, Pashupati, and Myneni, Ganapati R. Thu . "Superconducting radio-frequency cavities made from medium and low-purity niobium ingots". United States. doi:10.1088/0953-2048/29/6/064002. https://www.osti.gov/servlets/purl/1256296.
@article{osti_1256296,
title = {Superconducting radio-frequency cavities made from medium and low-purity niobium ingots},
author = {Ciovati, Gianluigi and Dhakal, Pashupati and Myneni, Ganapati R.},
abstractNote = {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.},
doi = {10.1088/0953-2048/29/6/064002},
journal = {Superconductor Science and Technology},
number = 6,
volume = 29,
place = {United States},
year = {2016},
month = {4}
}

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