Single Crystal and Large Grain Niobium Research at Michigan State University

As Superconducting Radio Frequency (SRF) technology is used in more accelerator designs, research has focused on increasing the efficiency of these accelerators by pushing gradients and investigating cost reduction options. Today, most SRF structures are fabricated from high purity niobium. Over yea...

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Bibliographic Details
Published in:AIP conference proceedings 2007-01, Vol.927 (1), p.98-105
Main Authors: Compton, Chris, Aizaz, Ahmad, Baars, Derek, Bieler, Tom, Bierwagen, John, Bricker, Steve, Grimm, Terry, Hartung, Walter, Jiang, Hairong, Johnson, Matt, Popielarski, John, Saxton, Laura, Antoine, Claire, Wagner, Bob, Kneisel, Peter
Format: Article
Language:English
Subjects:
CEBAF ACCELERATOR
CRYSTAL STRUCTURE
FABRICATION
FERMILAB ACCELERATOR
GHZ RANGE
GRAIN SIZE
HEAT TRANSFER
IMPURITIES
MATERIALS SCIENCE
MONOCRYSTALS
NIOBIUM
RECRYSTALLIZATION
RF SYSTEMS
SUPERCONDUCTING CAVITY RESONATORS
SUPERCONDUCTORS
TESTING
THERMODYNAMIC PROPERTIES
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Summary:As Superconducting Radio Frequency (SRF) technology is used in more accelerator designs, research has focused on increasing the efficiency of these accelerators by pushing gradients and investigating cost reduction options. Today, most SRF structures are fabricated from high purity niobium. Over years of research, a material specification has been derived that defines a uniaxial, fine grain structure for SRF cavity fabrication. Most recently a push has been made to investigate the merits of using single or large grain niobium as a possible alternative to fine grain niobium. Michigan State University (MSU), in collaboration with Fermi National Accelerator Laboratory (FNAL) and Thomas Jefferson National Accelerator Facility (JLAB), is researching large grain niobium via cavity fabrication processes and testing, as well as exploring materials science issues associated with recrystallization and heat transfer. Single-cell 1.3 GHz (beta=0.081) cavities made from both fine and large grain niobium were compared both in terms of fabrication procedures and performance. Two 7-cell cavities are currently being fabricated.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.2770682