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Post date: 01/23/2019 - 09:04

CfAS scientist Martina Esposito, working in the Leek group, developed a Josephson parametric amplifier (JPA) based on a lumped-element LC resonator which includes an array of superconducting quantum interference devices (SQUIDs). The main figures of merit of the device are a bandwidth BW = 15 MHz, a maximum gain G = 21 dB and a 1-dB compression point of -115 dBm. The characterization of the gain of the amplifier is shown in the figure.

Post date: 08/31/2018 - 12:55

Researchers from Oxford’s Centre for Applied Superconductivity (CfAS) in Oxford Physics  have uncovered the impressive properties of a novel superconductor, marking it out as the best of its kind with huge technological potential. The novel material in question, CaKFe4As4, was first synthesised only a couple of years ago both in Japan and Ames Laboratory, USA. Remarkably, its critical current density in single crystals was found to exceed that of all known iron-based superconductors, with a value of around 107 A/cm2.

Post date: 09/24/2017 - 21:40

Members of the CfAS team were treated to a fabulous tour of the CERN facility by Glynn Kirby.  As well as going into the LHC control room, we saw Nb3Sn Rutherford cable winding, all the stages of full-scale Nb3Sn magnet manufacture and the magnet development lab.   The EUCAS conference social also took place on the CERN site at the cryogenic magnet testing station.

Post date: 09/24/2017 - 21:07

Several members of the CfAS team attended the EUCAS 2017 conference in Geneva from 17th-21st September.  Some of the posters we presented on lead-free solders, joints in Bi-2212 and magnetic imaging of iron-based superconducting crystals can be found here.

Post date: 09/05/2017 - 23:27

A new approach to fabricate superconducting NbTi alloys