SRF2023 - List of Authors (Makita, J.)

Paper	Title	Page
MOPMB043	Characterization of Dissipative Regions of an N-Doped SRF Cavity	202
	E.M. Lechner, G. Ciovati JLab, Newport News, Virginia, USA G. Ciovati, A.V. Gurevich, J. Makita ODU, Norfolk, Virginia, USA M. Iavarone, E.M. Lechner, B.D. Oli Temple University, Philadelphia, USA
	Funding: DE-AC05-06OR23177 NSF Award No. 1734075 W911NF-16-2-0189 We report scanning tunneling microscopy measurements on N-doped cavity hot and cold spot cutouts. Analysis of the electron tunneling spectra using a proximity effect theory shows that hot spots have a reduced superconducting gap and a wider distribution of the contact resistance. Alone, these degraded superconducting properties account for a much weaker excess dissipation as compared with the vortex contribution. Based on the correlation between the quasiparticle density of states and temperature mapping, we suggest that degraded superconducting properties may facilitate vortex nucleation or settling of trapped flux during cooling the cavity through the critical temperature.
DOI •	reference for this paper ※ doi:10.18429/JACoW-SRF2023-MOPMB043
About •	Received ※ 19 June 2023 — Revised ※ 23 June 2023 — Accepted ※ 29 June 2023 — Issue date ※ 13 July 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Characterization of Dissipative Regions of an N-Doped SRF Cavity

202

E.M. Lechner, G. Ciovati
JLab, Newport News, Virginia, USA
G. Ciovati, A.V. Gurevich, J. Makita
ODU, Norfolk, Virginia, USA
M. Iavarone, E.M. Lechner, B.D. Oli
Temple University, Philadelphia, USA

Funding: DE-AC05-06OR23177 NSF Award No. 1734075 W911NF-16-2-0189
We report scanning tunneling microscopy measurements on N-doped cavity hot and cold spot cutouts. Analysis of the electron tunneling spectra using a proximity effect theory shows that hot spots have a reduced superconducting gap and a wider distribution of the contact resistance. Alone, these degraded superconducting properties account for a much weaker excess dissipation as compared with the vortex contribution. Based on the correlation between the quasiparticle density of states and temperature mapping, we suggest that degraded superconducting properties may facilitate vortex nucleation or settling of trapped flux during cooling the cavity through the critical temperature.

DOI •

reference for this paper ※ doi:10.18429/JACoW-SRF2023-MOPMB043

About •

Received ※ 19 June 2023 — Revised ※ 23 June 2023 — Accepted ※ 29 June 2023 — Issue date ※ 13 July 2023

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)