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 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.
- Authors:
-
- 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)
- 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. https://doi.org/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. https://doi.org/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 = {Thu Apr 07 00:00:00 EDT 2016},
month = {Thu Apr 07 00:00:00 EDT 2016}
}
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Works referencing / citing this record:
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