| About this Abstract |
| Meeting |
Materials Science & Technology 2012
|
| Symposium
|
Raymond W. Buckman, Jr. Memorial Symposium for Refractory Metals and Alloys
|
| Presentation Title |
Mechanical and Physical Metallurgy of High Purity Niobium used for Superconducting Radio Frequency Cavities for Particle Accelerators |
| Author(s) |
Thomas R. Bieler, Di Kang, Saravan K Chandrasekaran, Aboozar Mapar, Gianluigi Ciovati, Pashupati Dhakal, Ganapati R. Myneni, Neil T. Wright, Farhang Pourboghrat, Chris Compton |
| On-Site Speaker (Planned) |
Thomas R. Bieler |
| Abstract Scope |
Niobium superconducting radio frequency (SRF) cavities have achieved increasingly higher performance arising from increases in purity (to ~4N) and improvements in preparation of a nearly flawless interior surface. Some cavities have achieved the maximum theoretically attainable magnetic field, but this has not been achieved consistently. Thus, investigations of the physical metallurgy of Nb to determine the effects of dislocation substructure on cavity performance are under way. As managing the dislocation content throughout the manufacturing process in Nb is important, single crystal tensile samples have been analyzed to assess slip system behavior on {110} vs. {112} planes. Formability of slices from a large grain ingot are examined to identify effects of anisotropic plastic flow, welding, recovery, and recrystallization processes on important functional properties such as thermal conductivity, electron emission, and magnetic field flux trapping. This developing understanding has and will lead to rational processing strategies for cost-effective cavity performance. |
| Proceedings Inclusion? |
Definite: A CD-only volume |