Darmstadt 2016 – wissenschaftliches Programm

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 11: Poster

AKBP 11.21: Poster

Mittwoch, 16. März 2016, 18:30–20:30, S1/05 22-24

Structural analysis of nitrogen doped niobium single crystals* — •Marton Major1, Lambert Alff1, Jens Conrad2, Ruben Grewe2, Florian Hug3, Thorsten Kürzeder2, and Norbert Pietralla21Materialwissenschaft, Technische Universität Darmstadt, Darmstadt, Germany — 2Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany — 3Institut für Kernphysik, Johannes Gutenberg Universität Mainz, Mainz, Germany

Nitrogen doped niobium superconducting cavities show enhanced Q-factors. The cubic δ-phase of NbN has the highest Tc amongst the niobium nitride phases. Niobium cavities with NbN surface coating offer a way to improve the superconductive characteristics of accelerator cavities.

The high temperature UHV-furnace installed at S-DALINAC gives the opportunity to prepare samples of NbN via nitrogen doping of Nb. In parallel to this research, single crystals of Nb with different surface orientations will be annealed in nitrogen atmosphere to gain a basic understanding of the nitridation process. Those pilot experiments will take place at the Institute of Materials Research of the Technische Universität Darmstadt. The samples will be characterized by x-ray diffraction, atomic force microscopy and high resolution scanning electron microscopy. The collected experience will help in the analysis of N doped Nb samples of the UHV-furnace and pave the route to the N-doping of complete cavities. In this contribution the first results will be presented.

*Work supported by BMBF through 05H15RDRBA

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