Physical and mechanical metallurgy of high purity Nb for accelerator cavities

Journal Article · Fri Jan 01 00:00:00 EST 2010 · Physical Review Special Topics - Accelerators and Beams

DOI:https://doi.org/10.1103/PhysRevSTAB.13.031002· OSTI ID:979346

Bieler, T. R. ^[1]; Wright, N. T. ^[1]; Pourboghrat, F. ^[1]; Compton, C. ^[1]; Hartwig, K. T. ^[2]; Baars, D. ^[1]; Zamiri, A. ^[1]; Chandrasekaran, S. ^[1]; Darbandi, P. ^[1]; Jiang, H. ^[1]; Skoug, E. ^[1]; Balachandran, S. ^[2]; Ice, Gene E ^[3]; Liu, W. ^[4]

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1. Michigan State University, East Lansing
2. Texas A&M University
3. ORNL
4. Argonne National Laboratory (ANL)

In the past decade, high Q values have been achieved in high purity Nb superconducting radio frequency (SRF) cavities. Fundamental understanding of the physical metallurgy of Nb that enables these achievements is beginning to reveal what challenges remain to establish reproducible and cost-effective production of high performance SRF cavities. Recent studies of dislocation substructure development and effects of recrystallization arising from welding and heat treatments and their correlations with cavity performance are considered. With better fundamental understanding of the effects of dislocation substructure evolution and recrystallization on electron and phonon conduction, as well as the interior and surface states, it will be possible to design optimal processing paths for cost-effective performance using approaches such as hydroforming, which minimizes or eliminates welds in a cavity.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 979346
• Journal Information: Physical Review Special Topics - Accelerators and Beams, Vol. 13, Issue 3; ISSN 1098-4402
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
CAVITIES
DESIGN
DISLOCATIONS
ELECTRONS
HEAT TREATMENTS
METALLURGY
PERFORMANCE
PHONONS
PHYSICAL METALLURGY
PROCESSING
PRODUCTION
RECRYSTALLIZATION
WELDING