München 2019 – wissenschaftliches Programm
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 14: Radiofrequency 2
AKBP 14.4: Vortrag
Donnerstag, 21. März 2019, 14:45–15:00, HS 7
Nitrogen-doped niobium for SRF cavities — •Márton Major1, Matthias Mahr1, Stefan Flege1, Lambert Alff1, Jens Conrad1, Ruben Grewe1, Michaela Arnold1, Norbert Pietralla1, and Florian Hug2 — 1Technische Universität Darmstadt, Darmstadt, Germany — 2Johannes Gutenberg Universität Mainz, Mainz, Germany
Niobium is the standard material for superconducting RF (SRF) cavities. Superconducting materials with higher critical temperature or higher critical magnetic field allow cavities to work at higher operating temperatures or higher accelerating fields, respectively. One direction of search for new materials with better properties is the modification of bulk niobium by nitrogen doping. In the Nb-N phase diagram the cubic δ-phase of NbN has the highest critical temperature (16 K).
Niobium samples were N-doped at the refurbished UHV furnace at IKP Darmstadt. In parallel, reference samples were annealed in 1 bar nitrogen atmosphere at different temperatures in a tube furnace. In this contribution we focus on the structural investigations (x-ray diffraction and pole figure, secondary ion mass spectroscopy, scanning electron microscopy) of the doped samples.
Work supported by the German Federal Ministry for Education and Research (BMBF) through grants 05H15RDRBA and 05H18RDRB2.