SMuK 2023 – wissenschaftliches Programm

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 11: RF and SRF Research

AKBP 11.4: Vortrag

Mittwoch, 22. März 2023, 18:15–18:30, CHE/0184

Development of a system for the rapid RF characterization of superconducting samples — •Sebastian Keckert¹, Felix Kramer¹, Oliver Kugeler¹, and Jens Knobloch^1,2 — ¹Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Berlin — ²Universität Siegen, Fachbereich Physik, Siegen

Niobium is currently the material of choice to produce superconducting radio frequency (SRF) cavities for applications in particle accelerators. These cavities are operated at temperatures of 2 K or lower to ensure manageable dynamic losses at high accelerating gradients. Presently, alternative materials to niobium and composite structures relying on thin film coatings are investigated in various R&D projects. Applied to SRF cavities such an advanced material or coating will allow performances beyond the fundamental limits of niobium and eventually operation temperatures of 4.2 K or higher. The development of such coatings requires RF characterization of superconducting samples and especially measurements of the RF surface resistance.

This contribution discusses the development and first commissioning results of a Rapid Superconductor Test Apparatus (RaSTA), a compact sample test cavity. In contrast to other test setups, RaSTA allows to distinguish BCS and residual resistance with high resolution but with far shorter turnaround times, enabling systematic studies of multiple samples and thus iterative optimization of materials production techniques.