Dortmund 2021 – wissenschaftliches Programm

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 3: Radiofrequency

AKBP 3.4: Vortrag

Dienstag, 16. März 2021, 14:45–15:00, AKBPb

Nitrogen-doping of niobium for SRF cavities — •Márton Major, Stefan Flege, Lambert Alff, Jens Conrad, Ruben Grewe, Michaela Arnold, and Norbert Pietralla — Technische Universität Darmstadt, Darmstadt, Germany

Niobium is the standard material for superconducting RF (SRF) cavities. Superconducting materials with higher critical temperature and higher critical magnetic field allow cavities to work at higher operating temperatures and higher accelerating fields. 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).

For the investigation of the NbN phases niobium samples were doped at the refurbished UHV furnace at IKP Darmstadt. 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. We show results of the first samples with NbN surface phase.

Work supported by the German Federal Ministry for Education and Research (BMBF) through grant 05H18RDRB2 and the German Research Foundation (DFG) via the AccelencE Research Training Group (GRK 2128).