33 citations · 80 across the 12 of their papers we have counts for
12 papers
A Three-Fluid Model of Dissipation at Surfaces in Superconducting Radiofrequency Cavities
Matthias Liepe Michelle M. Kelley, Sean Deyo, Nathan Sitaraman +4
Experiments on superconducting cavities have found that under large RF fields the quality factor can improve with increasing field amplitude, a so-called ``anti-Q slope.'' We numer…
Synthesis and Characterization of Atomically-Sharp Superconductor-Dielectric Interface
Nathan Sitaraman, Zhaslan Baraissov, Alexis Grassl +4
Modification of superconductor-dielectric interfaces is known to strongly impact coherence times of superconducting quantum devices. This relationship is thought to arise from diff…
A Computational Picture of Hydride Formation and Dissipation In Nb SRF Cavities
Aiden Harbick, Mark Transtrum, Nathan Sitaraman +2
Research linking surface hydrides to Q-disease, and the subsequent development of methods to eliminate surface hydrides, is one of the great successes of SRF cavity R&D. We use tim…
Theory of Eliminating Surface Oxides of Superconductors with Noble-Metal Encapsulation
Cristóbal Méndez, Nathan Sitaraman, Matthias Liepe +1
Nanometer-scale surface chemistry limits the performance of SRF cavities and quantum circuits. We present an ab initio framework connecting DFT interfacial energetics with strong-c…
ZrNb(CO) RF superconducting thin film with high critical temperature in the theoretical limit
Zeming Sun, Thomas Oseroff, Zhaslan Baraissov +11
Superconducting radio-frequency (SRF) resonators are critical components for particle accelerator applications, such as free-electron lasers, and for emerging technologies in quant…
Theory of Nb-Zr Alloy Superconductivity and First Experimental Demonstration for Superconducting Radio-Frequency Cavity Applications
Nathan S. Sitaraman, Zeming Sun, Ben Francis +8
Niobium-zirconium (Nb-Zr) alloy is an old superconductor that is a promising new candidate for superconducting radio-frequency (SRF) cavity applications. Using density-functional a…
Dissipation by surface states in superconducting RF cavities
Sean Deyo, Michelle Kelley, Nathan Sitaraman +5
Recent experiments on superconducting cavities have found that under large radio-frequency (RF) electromagnetic fields the quality factor can improve with increasing field amplitud…
Theory of the Impact from Grain Boundaries and Substitutional Defects on Superconducting NbSn
Michelle M. Kelley, Nathan S. Sitaraman, Tomás A. Arias
Grain boundaries play a critical role in applications of superconducting NbSn: in dc applications, grain boundaries preserve the material's inherently high critical current den…
Analysis of Magnetic Vortex Dissipation in Sn-Segregated Boundaries in NbSn Superconducting RF Cavities
Jared Carlson, Alden Pack, Mark K. Transtrum +9
We study mechanisms of vortex nucleation in NbSn Superconducting RF (SRF) cavities using a combination of experimental, theoretical, and computational methods. Scanning transmi…
Study of Antisite Defects in NbSn: Phase Diagram and Impact on Superconductivity
Nathan S. Sitaraman, Jared Carlson, Alden R. Pack +4
Antisite defects play a critical role in NbSn superconducting radio frequency (SRF) cavity physics. Such defects are the primary form of disorder in NbSn, and are responsib…
SRF Theory Developments from the Center for Bright Beams
Danilo B. Liarte, Tomas Arias, Daniel L. Hall +5
We present theoretical studies of SRF materials from the Center for Bright Beams. First, we discuss the effects of disorder, inhomogeneities, and materials anisotropy on the maximu…
In-vacuum scattered light reduction with cupric oxide surfaces for sensitive fluorescence detection
Eric B. Norrgard, Nathan Sitaraman, John F. Barry +3
We demonstrate a simple and easy method for producing low-reflectivity surfaces that are ultra-high vacuum compatible, may be baked to high temperatures, and are easily applied eve…