Nanoscale nonlinear radio frequency properties of bulk Nb: Origins of extrinsic nonlinear effects

Tamin Tai, B. G. Ghamsari, T. Bieler, Steven M. Anlage

Research output: Contribution to journalArticle

  • 8 Citations

Abstract

The performance of niobium-based superconducting radio frequency (SRF) particle-accelerator cavities can be sensitive to localized defects that give rise to quenches at high accelerating gradients. In order to identify these material defects on bulk Nb surfaces at their operating frequency and temperature, a wide-bandwidth microwave microscope with localized and strong RF magnetic fields is developed by integrating a magnetic write head into the near-field microwave microscope to enable mapping of the local electrodynamic response in the multi-GHz frequency regime at cryogenic temperatures. This magnetic writer demonstrates a localized and strong RF magnetic field on bulk Nb surface with Bsurface>102 mT and submicron resolution. By measuring the nonlinear response of the superconductor, nonlinearity coming from the nanoscale weak-link Josephson junctions due to the contaminated surface in the cavity-fabrication process is demonstrated.

LanguageEnglish (US)
Article number134513
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number13
DOIs
StatePublished - Oct 16 2015

Profile

radio frequencies
Microscopes
microscopes
Microwaves
Niobium
Magnetic fields
microwaves
Defects
cavities
particle accelerators
Electrodynamics
defects
cryogenic temperature
magnetic fields
niobium
electrodynamics
Josephson junctions
Cryogenics
Superconducting materials
Particle accelerators

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Nanoscale nonlinear radio frequency properties of bulk Nb : Origins of extrinsic nonlinear effects. / Tai, Tamin; Ghamsari, B. G.; Bieler, T.; Anlage, Steven M.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 92, No. 13, 134513, 16.10.2015.

Research output: Contribution to journalArticle

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