BYU

Abstract by Jared Carlson

Personal Infomation


Presenter's Name

Jared Carlson

Degree Level

Undergraduate

Abstract Infomation


Department

Physics and Astronomy

Faculty Advisor

Mark Transtrum

Title

Role of grain boundaries on magnetic vortex nucleation in RF superconducting cavities

Abstract

Superconducting Radio Frequency (SRF) cavities are important components of particle accelerators. SRF cavity performance is limited by a maximum allowed applied magnetic field, known as the superheating field (Hsh) at which magnetic vortices spontaneously enter the material and cause the superconducting material to quench. Previous work has calculated the theoretical maximum field a superconductor can withstand. However, this calculation assumed a perfectly smooth surface with no material inhomogeneities or surface roughness, whereas real world cavities exhibit these characteristics. I use the time-dependent Ginzburg-Landau theory to model the role of surface defects and material variation in magnetic vortex nucleation. Results show that the amount by which Hsh is reduced depends on the concentration of impurities as well as the physical dimensions of the defect. Reducing the size of grain boundaries and material inhomogeneities found therein has the potential to significantly increase SRF cavity performance.