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Title: Mechanical Properties of Niobium Cavities

The mechanical stability of bulk Nb cavity is an important aspect to be considered in relation to cavity material, geometry and treatments. Mechanical properties of Nb are typically obtained from uniaxial tensile tests of small samples. In this contribution we report the results of measurements of the resonant frequency and local strain along the contour of single-cell cavities made of ingot and fine-grain Nb of different purity subjected to increasing uniform differential pressure, up to 6 atm. Measurements have been done on cavities subjected to different heat treatments. Good agreement between finite element analysis simulations and experimental data in the elastic regime was obtained with a single set of values of Young’s modulus and Poisson’s ratio. The experimental results indicate that the yield strength of medium-purity ingot Nb cavities is higher than that of fine-grain, high-purity Nb.
Authors:
 [1] ;  [1] ;  [1] ;  [1]
  1. Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Publication Date:
OSTI Identifier:
1223475
Report Number(s):
JLAB-ACC--15-2033; DOE/OR/23177--3394
TRN: US1601441
DOE Contract Number:
AC05-06OR23177
Resource Type:
Conference
Resource Relation:
Conference: IPAC 2015, Richmond, VA (United States), 3-8 May 2015
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 43 PARTICLE ACCELERATORS; YIELD STRENGTH; EXPERIMENTAL DATA; NIOBIUM; CAVITY RESONATORS; FINITE ELEMENT METHOD; IMPURITIES; GEOMETRY; HEAT TREATMENTS; COMPUTERIZED SIMULATION; PRESSURE DEPENDENCE; PRESSURE RANGE KILO PA; STRAINS; YOUNG MODULUS; POISSON RATIO; TEMPERATURE RANGE 1000-4000 K