Impact of geometry on flux trapping and the related surface resistance in a superconducting cavity

Felix Kramer; Oliver Kugeler; Julia-Marie Köszegi; Jens Knobloch

doi:10.1103/PhysRevAccelBeams.23.123101

← Back to search

Impact of geometry on flux trapping and the related surface resistance in a superconducting cavity

Felix Kramer, Oliver Kugeler, Julia-Marie Köszegi, Jens Knobloch

DOI 10.1103/PhysRevAccelBeams.23.123101 · Physical Review Accelerators and Beams

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

In order to minimize the surface resistance in superconducting cavities, a deeper understanding of residual resistance due to trapped magnetic flux is necessary. For that purpose, a combined temperature and magnetic field mapping system is employed to map magnetic flux trapped in a superconducting cavity, and the related increase in surface resistance. By cooling down a 1.3 GHz TESLA single cell cavity several times with externally applied static magnetic fields with different orientations with respect to the cavity, a statement can be made about how the angle between the applied magnetic field and the cavity’s surface affects flux trapping, and surface resistance. For example, a significantly higher increase in surface resistance is observed when the applied magnetic field is perpendicular to the cavity’s surface compared to when it is parallel.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	9.2	Pressure unresolved	onset