JACoW is a publisher in Geneva, Switzerland that publishes the proceedings of accelerator conferences held around the world by an international collaboration of editors.
TY - UNPB
AU - Sheikhzada, A.
AU - Gurevich, A.V.
ED - Saito, Kenji
ED - Xu, Ting
ED - Sakamoto, Naruhiko
ED - Lesage, Ana
ED - Schaa, Volker R.W.
TI - Dynamic Penetration Field of Vortices in a Superconductor Under RF Magnetic Field
J2 - Proc. of SRF2021, East Lansing, MI, USA, 28 June-02 July 2021
CY - East Lansing, MI, USA
T2 - International Conference on RF Superconductivity
T3 - 20
LA - english
AB - We address the nonlinear dynamics of penetration of vortices in a superconductor subject to a periodic magnetic field H(t)=H₀\sinω t parallel to the surface. The time-dependent Ginzburg-Landau equations for a gapped superconductor were simulated numerically to calculate the frequency and temperature dependencies of the field onset H_{p}(T,ω) of vortex penetration at T≈ T_{c}. It is shown that H_{p}(T,ω) can exceed the dc superheating field H_{s} at which the Meissner state becomes unstable. Here H_{p}(T,ω) increases with ω and approaches √{2}H_{s}(T) at ωτ≥ 1, where τ(T) is the energy relaxation time of quasiparticles on phonons. We also investigated the effect of surface topographic defects on H_{p}(T,ω) and showed that they can substantially reduce H_{p}(T,ω) and cause additional power dissipation. Ultimately, we draw conclusions by comparing the results of our calculations with recent experimental measurements.
PB - JACoW Publishing
CP - Geneva, Switzerland
ER -