In the frame of a close collaboration, three laboratories namely Institut de Physique Nucleaire d’Orsay (IPN), Centre de Spectrometrie Nucleaire et de Spectrometrie de Masse (CSNSM) and the Institut de Recherche sur les lois Fondamentales de l’Univers (IRFU-CEA Saclay) offer a post-doctoral position granted by the cluster P2IO (www.labex-p2io.fr). Superconducting radiofrequency resonators made with bulk niobium of high purity are increasingly used in linear particle accelerators (CEBAF, SNS, XFEL,…). However the accelerating gradient record reached with a single cell cavity for ILC (KEK design) is just below the theoretical limit (52.8MV/m for Bc=200mT). In order to improve RF performances of the cavities, the development of new superconducting materials with higher critical magnetic field and critical temperature than bulk niobium is mandatory. An alternative – based on A. Gurevich model – is to deposit a multilayer assembly of high Tc type II superconductor with thickness smaller than ?L with a dielectric material (Superconductor-Insulator-Superconductor) onto a bulk niobium substrate. This kind of nanocomposite materials could improve both the maximum accelerating gradient and cryogenic efficiency of the future machine. Our group formed since one year benefits of their experiences in film growing, local characterization of physical properties and measurements of RF properties.
Strong experimental activities are an essential part of this position. A PhD in physics and deposition techniques (CVD, magnetron sputtering,…) is required to apply along with an experience in surface characterization techniques, important experimental skills and/or work in SRF environment. Starting 1st October 2012, this position will last two years.