arXiv subjects

Claire Z. Antoine

Publications and source records attributed to Claire Z. Antoine.

3 recordsLinked to original sources

arXiv2023

Superconductivity in particle accelerators

This text is a full transcription of a lecture was given in the Joint Universities Accelerator School (JUAS) in 2023. A much shorter version is to be published in the JUAS book in 2024, along with all other lectures from the JUAS school. The aim of this lecture is to provide to physicists non-expert in materials science a glimpse on how superconducting materials are tailored (and must be chosen) for their specific application in accelerators.

physics.acc-ph↗

arXiv2022

A model for hot spots and Q-slope in granular Niobium thin film superconducting RF cavities

We propose a model to explain power dissipation leading to the formation of hot spots in the inner walls of niobium thin film superconducting RF cavities. The physical mechanism that we explore is due to the constriction of surface electrical current flow at grain interface boundaries. This constriction creates an additional electrical contact resistance which induces localized punctual heat dissipation. The temperature at these spots is derived; and the electrical contact resistance is shown to depend on the magnetic field, on the gain contact size over which dissipation occurs, and on other key parameters, including the effective London penetration depth and the frequency. The surface resistance and the quality factors are determined using our model and are shown to be in excellent agreement with experimental data.

cond-mat.supr-con↗

arXiv2015

How to Achieve the Best SRF Performance: (Practical) Limitations and Possible Solutions

This tutorial presents in the first part the requirement for the surface preparation of RF Niobium cavities and its justification in term s of physical origin of limitation (e.g. cleanliness and field emission, influence of the surface treatments, morphology and surface damage, etc.). in the second part we discuss the different models describing the ultimate limits of SRF cavities, and present one of the possible ways to overcome Niobium monopoly toward higher performances.

physics.acc-ph↗