Numerical analysis of a folded superconducting coaxial shield for cryogenic current comparators

Influence of Mechanical Deformations on the Performance of a Coaxial Shield for a Cryogenic Current Comparator

“…8 that an increase in g leads to an increase in η. Let us note that this behaviour is expected, since larger air gap sizes are known to decrease the coaxial CCC shield performance even in the ideal undeformed case [6].…”

“…where η 0,def d,m,s is associated with the deformed geometry and η 0,und d with the undeformed one 6 . Afterwards, we collect in Table II the maximum value of ε d,m,s for each d, that is formally…”

“…This component is magnetically coupled with a pickup loop and (optionally) a highly permeable core. Depending on the geometry of the shield and on the location of the pickup coil, different variants can be built, such as the (folded-)coaxial [4], [5], [6], the ring [7] or the overlapped tube [8] CCC shields just to name a few. Among the applications of those CCCs, let us mention that overlapped tube variants have been successfully used in metrological applications, such as the accurate measurement of resistances for instance (see e.g.…”

“…The damping of the CCC shield can be mathematically proven and quantified when considering a geometry with an axial symmetry (e.g. see [4] or [6]). However, in practice, mechanical deformations break this symmetry.…”

Coreless SQUID-based cryogenic current comparator for non-destructive intensity diagnostics of charged particle beams

“…Accordingly, we were able to estimate the main magnetic sensitive component of the beam monitor, which allows for the optimization of shielding geometry for a given application with known magnetic background fields in future devices. A more detailed discussion on the magnetic shielding performance is given in [15].…”