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Title: Overview of the RRR Nb Specifications and the Evolution of SRF Technology

Abstract

Maury Tigner’s classical review paper, “RF Superconductivity For Accelerators – Is It A Hollow Promise”# summarizes the pioneering work that was carried out from mid 1960’s to late 1070’s and is a must reading for all the new comers in to SRF world. The specifications of high purity niobium for SRF cavities seem to have evolved between 1979 and 1987. Fine grain high purity niobium has been the material of choice for SRF cavities for the past two decades. The current high RRR niobium material specifications will be reviewed from the historical context. The specification discussions include grain size, ductility, yield strength, thermal conductivity and residual resistance ratio. The effect of each of these material characteristic on the process and performance of the cavities will be explored. The recent progress on the single crystal - large grain niobium technology and its potential impact on the cost and performance of ILC cavities will be discussed. The possible relaxation of specifications, such as residual resistance ratio and Tantalum content will be presented from the perspective of reducing the cavity fabrication costs for industrial applications. Further, a summary of the low temperature mechanical properties of polycrystalline niobium will also be presented.

Authors:
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA
Sponsoring Org.:
USDOE - Office of Energy Research (ER)
OSTI Identifier:
908631
Report Number(s):
JLAB-ACC-07-624; DOE/OR/23177-0051
TRN: US0703722
DOE Contract Number:
AC05-06OR23177
Resource Type:
Conference
Resource Relation:
Conference: Fermi Lab SRF Materials Workshop, May 23, 2007, Fermilab
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 43 PARTICLE ACCELERATORS; ACCELERATORS; CAVITIES; DUCTILITY; FABRICATION; GRAIN SIZE; MECHANICAL PROPERTIES; MONOCRYSTALS; NIOBIUM; PERFORMANCE; RELAXATION; SPECIFICATIONS; SUPERCONDUCTIVITY; TANTALUM; THERMAL CONDUCTIVITY; YIELD STRENGTH

Citation Formats

G.R. Myneni. Overview of the RRR Nb Specifications and the Evolution of SRF Technology. United States: N. p., 2007. Web.
G.R. Myneni. Overview of the RRR Nb Specifications and the Evolution of SRF Technology. United States.
G.R. Myneni. Wed . "Overview of the RRR Nb Specifications and the Evolution of SRF Technology". United States. doi:. https://www.osti.gov/servlets/purl/908631.
@article{osti_908631,
title = {Overview of the RRR Nb Specifications and the Evolution of SRF Technology},
author = {G.R. Myneni},
abstractNote = {Maury Tigner’s classical review paper, “RF Superconductivity For Accelerators – Is It A Hollow Promise”# summarizes the pioneering work that was carried out from mid 1960’s to late 1070’s and is a must reading for all the new comers in to SRF world. The specifications of high purity niobium for SRF cavities seem to have evolved between 1979 and 1987. Fine grain high purity niobium has been the material of choice for SRF cavities for the past two decades. The current high RRR niobium material specifications will be reviewed from the historical context. The specification discussions include grain size, ductility, yield strength, thermal conductivity and residual resistance ratio. The effect of each of these material characteristic on the process and performance of the cavities will be explored. The recent progress on the single crystal - large grain niobium technology and its potential impact on the cost and performance of ILC cavities will be discussed. The possible relaxation of specifications, such as residual resistance ratio and Tantalum content will be presented from the perspective of reducing the cavity fabrication costs for industrial applications. Further, a summary of the low temperature mechanical properties of polycrystalline niobium will also be presented.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed May 23 00:00:00 EDT 2007},
month = {Wed May 23 00:00:00 EDT 2007}
}

Conference:
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