Speaker Highlight - Particle Accelerator Engineering Network Annual Event
See Tobias Juniger's biography below:
Tobias Junginger recived his PhD in 2012 from the University of Heidelberg working on surface resistance measurements with a sample test cavity named Quadrupole Resonator at CERN. Currently he is a Marie Curie International Outgoing Fellow at HZB and TRIUMF. The focus of his work is on material characterization for superconducting radio-frequency (SRF) cavities with techniques like muon spin rotation and relaxation, neutron radiography and beta detected nuclear magnetic resonance spectroscopy. He will join Lancaster University and the Cockcroft Institute as a lecturer to continue his research into multilayers/new materials for SRF.
Most superconducting cavities are built from niobium sheets. A cost effective alternative approach is to sputter coat micrometer thin niobium films on copper cavities, developed for LEP-II and currently in use for LHC and HIE-Isolde. The performance of such thin film cavities is limited by the field dependent RF residual surface resistance. Several new techniques are currently being developed to overcome this limitation. HiPIMS is very similar to the standard dcMS. Films have been deposited and tested on 1.3 GHz test cavities. Other coating techniques like electron cyclotron resonance (ECR) are not yet developed to be deposited on cavities. Here sample tests are necessary to test the RF performance. A suitable device which can measure the surface resistance with unpreceded accuracy is the Quadrupole Resonator from CERN, which has more recently been rebuilt and further developed at HZB. Additionally DC methods can be used to probe the superconducting properties of samples and guide the development of the coating process. Two techniques which have been proven to be very informative for SRF developments are muon spin rotation and point contact tunneling. This article reviews RF and DC methods and results on test cavities and samples for SRF application.
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