Publications (32)
Theoretical estimates of maximum fields in superconducting resonant radio frequency cavities: Stability theory, disorder, and laminates
Danilo B. Liarte, Sam Posen, Mark K. Transtrum +3
Theoretical limits to the performance of superconductors in high magnetic fields parallel to their surfaces are of key relevance to current and future accelerating cavities, especi…
Theoretical Field Limits for Multi-Layer Superconductors
Sam Posen, Gianluigi Catelani, Matthias U. Liepe +2
The SIS structure---a thin superconducting film on a bulk superconductor separated by a thin insulating film---was propsed as a method to protect alternative SRF materials from flu…
Microwave Vortex Motion Characterization of NbSn Coatings for Applications in High Magnetic Fields
Pablo Vidal GarcÃa, Andrea Alimenti, Dorothea Fonnesu +8
In this work, microwave measurements carried out in dielectric-loaded resonators exposed to high magnetic fields are exploited to yield the surface impedance of NbSn supercondu…
Nuclear spin coherence in superconducting NbSn
Gan Zhai, William P. Halperin, Arneil P. Reyes +4
We have investigated the normal and superconducting states of the technologically important compound NbSn using Nb nuclear magnetic resonance. From spin-lattice relaxati…
Measuring axion gradients with photon interferometry (MAGPI)
Michael A. Fedderke, Jedidiah O. Thompson, Raphael Cervantes +5
We propose a novel search technique for axions with a -violating monopole coupling to bulk Standard Model charges . Gradients in the static axi…
Atomic scale analysis of Nb3Sn on Nb prepared by a vapor-diffusion process for superconducting radiofrequency cavity applications
Jaeyel Lee, Sam Posen, Zugang Mao +5
We report an atomic-scale analysis of the microstructure of Nb3Sn coating on Nb prepared by vapor diffusion process for superconducting radiofrequency (SRF) cavity application usin…
Cryogenic RF characterization of the MAGO cavity for high-frequency gravitational-wave detection
Can Dokuyucu, Bianca Giaccone, Tom Krokotsch +13
Superconducting radio-frequency (SRF) cavities are promising resonant sensors for gravitational-wave detection in the kHz-MHz frequency range. We report the cryogenic RF characteri…
Plasma Cleaning of LCLS-II-HE verification cryomodule cavities
Bianca Giaccone, Paolo Berrutti, Martina Martinello +14
Plasma cleaning is a technique that can be applied in superconducting radio-frequency (SRF) cavities in situ in cryomodules in order to decrease their level of field emission. We d…
An Improved Bound on Nonlinear Quantum Mechanics using a Cryogenic Radio Frequency Experiment
Oleksandr Melnychuk, Bianca Giaccone, Nicholas Bornman +9
There are strong arguments that quantum mechanics may be nonlinear in its dynamics. A discovery of nonlinearity would hint at a novel understanding of the interplay between gravity…
First characterisation of the MAGO cavity, a superconducting RF detector for kHz-MHz gravitational waves
Lars Fischer, Bianca Giaccone, Ivan Gonin +12
Heterodyne detection using microwave cavities is a promising method for detecting high-frequency gravitational waves or ultralight axion dark matter. In this work, we report on stu…
Improving Nb3Sn Cavity Performance Using Centrifugal Barrel Polishing
Eric Viklund, David N. Seidman, David Burk +1
In this study we will show a new method of polishing for Nb3Sn cavities known as centrifugal barrel polishing (CBP). Using this method, Nb3Sn coated samples are polished to a surfa…
Simulations of Layer RF Field Limits Due to Thermal Impedance
Paulina Kulyavtsev, Grigory Eremeev, Sam Posen
performance in RF fields is limited to fields far below its superheating critical field. Poor thermal conductivity of has been speculated to be the reason beh…
Nuclear Magnetic Resonance Investigation of Superconducting and Normal State NbSn
Gan Zhai, William P. Halperin, Arneil P. Reyes +5
The superconductor NbSn has a high critical temperature and high critical field, widely used for high-field superconducting magnets. In this work we investigate its microscopic…
A Precision Gyroscope from the Helicity of Light
Michael A. Fedderke, Roni Harnik, David E. Kaplan +4
We describe a gyroscope that measures rotation based on the effects of the rotation on the polarization of light. Rotation induces a differential phase shift in the propagation of…
Frequency dependence of trapped flux sensitivity in SRF cavities
Mattia Checchin, Martina Martinello, Anna Grassellino +6
In this letter, we present the frequency dependence of the vortex surface resistance of bulk niobium accelerating cavities as a function of different state-of-the-art surface treat…
Selective thermal evolution of native oxide layer in Nb and Nb3Sn-coated SRF grade Nb: An in-situ angular XPS study
Arely Cano, Grigory V. Eremeev, Juan R. Zuazo +5
This contribution discusses the results of an in-situ angular XPS study on the thermal evolution of the native oxide layer on Nb3Sn and pure Nb. XPS data were recorded with convent…
Grain-boundary structure and segregation in Nb3Sn coatings on Nb for high-performance superconducting radiofrequency cavity applications
Jaeyel Lee, Zugang Mao, Kai He +7
We report on atomic-scale analyses of grain boundary (GB) structures and segregation in Nb3Sn coatings on Nb, prepared by the vapor-diffusion process, for superconducting radiofreq…
Analysis of Niobium Electropolishing Using a Generalized Distribution of Relaxation Times Method
Eric Viklund, Vijay Chouhan, Davida Smith +3
Using electrochemical impedance spectroscopy, we have devised a method of sensing the microscopic surface conditions on the surface of niobium as it is undergoing an electrochemica…
Microstructural Characterization of Nb3Sn Thin Films Using FIB Tomography
Eric Viklund, David N. Seidman, Sam Posen
The accelerating gradient of Nb3Sn superconducting radiofrequency (SRF) cavities is currently limited, and the underlying cause remains an open question in the field. One leading h…
Healing Gradient Degradation in Nb3Sn SRF Cavities Using a Recoating Method
Eric Viklund, David N. Seidman, Brad M. Tennis +2
Despite having advantageous superconducting properties, Nb3Sn superconducting radiofrequency (SRF) cavities still have practical challenges compared to Nb SRF cavities due to the b…
Searches for New Particles, Dark Matter, and Gravitational Waves with SRF Cavities
Asher Berlin, Sergey Belomestnykh, Diego Blas +33
This is a Snowmass white paper on the utility of existing and future superconducting cavities to probe fundamental physics. Superconducting radio frequency (SRF) cavity technology…
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…
RF Accelerator Technology R&D: Report of AF7-rf Topical Group to Snowmass 2021
Sergey Belomestnykh, Emilio A. Nanni, Hans Weise +18
Accelerator radio frequency (RF) technology has been and remains critical for modern high energy physics (HEP) experiments based on particle accelerators. Tremendous progress in ad…
Shielding superconductors with thin films
Sam Posen, Mark K. Transtrum, Gianluigi Catelani +2
Determining the optimal arrangement of superconducting layers to withstand large amplitude AC magnetic fields is important for certain applications such as superconducting radiofre…
Nitrogen-Doped 9-Cell Cavity Performance in a Test Cryomodule for LCLS-II
Dan Gonnella, Ralf Eichhorn, Fumio Furuta +13
The superconducting RF linac for LCLS-II calls for 1.3 GHz 9-cell cavities with an average intrinsic quality factor Q0 of 2.7x10^10 at 2 K and 16 MV/m accelerating gradient. Two ni…
The International Linear Collider: Report to Snowmass 2021
Alexander Aryshev, Ties Behnke, Mikael Berggren +508
The International Linear Collider (ILC) is on the table now as a new global energy-frontier accelerator laboratory taking data in the 2030s. The ILC addresses key questions for our…
Response to comment on theoretical RF field limits of multilayer coating structures of superconducting resonator cavities
Sam Posen, Gianluigi Catelani, Matthias U. Liepe +2
A comment to the authors' SRF Conference pre-print [1] was submitted by A. Gurevich to the arXiv [2]. In this response, we show that the arguments used in the comment are not valid…
Improved Dark Photon Sensitivity from the Dark SRF Experiment
Saarik Kalia, Zhen Liu, Bianca Giaccone +15
We report the refined dark-photon exclusion bound from Dark SRF's pathfinder run. Our new result is driven by improved theoretical modeling of frequency instability in high-quality…
Deepest sensitivity to wavelike dark photon dark matter with superconducting radio frequency cavities
Raphael Cervantes, Jose Aumentado, Caterina Braggio +9
Wavelike, bosonic dark matter candidates like axions and dark photons can be detected using microwave cavities known as haloscopes. Traditionally, haloscopes consist of tunable cop…
Design of axion and axion dark matter searches based on ultra high Q SRF cavities
Bianca Giaccone, Asher Berlin, Ivan Gonin +13
The Superconducting Quantum Materials and Systems center is developing searches for dark photons, axions and ALPs with the goal of improving upon the current state-of-the-art sensi…
Evaluation of predictive correlation between flux expulsion and grain growth for superconducting radio frequency cavities
Zu Hawn Sung, Paulina Kulyavtsev, Martina Martinello +3
A series of experiments were carried out in an effort to develop a simple method for predicting magnetic flux expulsion behavior of high purity niobium used to fabricate supercondu…
Phase-controlled improvement of photon lifetime in coupled superconducting cavities
Changqing Wang, Oleksandr S Melnychuk, Crispin Contreras-Martinez +9
High-quality cavities are crucial for various fundamental physical studies and applications. Here we find that by coupling two cavities directly or via a phase-tunable coupling cha…