19 citations · 114 across the 21 of their papers we have counts for
21 papers
Advanced surface treatments for medium-velocity superconducting RF cavities for high accelerating gradient continuous-wave operation
K. McGee, S. Kim, K. Elliott +13
Nitrogen-doping and furnace-baking are advanced high-Q0 recipes developed for 1.3 GHz TESLA-type cavities. These treatments will significantly benefit the high-Q0 linear accelerato…
Preservation of the High Quality Factor and Accelerating Gradient of Nb3Sn-coated Cavity During Pair Assembly
G. Eremeev, U. Pudasaini, S. Cheban +6
Two CEBAF 5-cell accelerator cavities have been coated with Nb3Sn film using the vapor diffusion technique. One cavity was coated in the Jefferson Lab Nb3Sn cavity coating system,…
Commissioning of Dedicated Furnace for Nb3Sn Coatings of 2.6 GHz Single Cell Cavities
P. A. Kulyavtsev, G. Eremeev, S. Posen +2
We present the results of commissioning a dedicated furnace for Nb3Sn coatings of 2.6 GHz single cell cavities. Nb3Sn is a desired coating due to its high critical temperature and…
First Results from Nb3Sn Coatings of 2.6 GHz Nb SRF Cavities Using DC Cylindrical Magnetron Sputtering System
M. S. Shakel, H. E. Elsayed-Ali, G. Eremeev +2
A DC cylindrical magnetron sputtering system has been commissioned and operated to deposit Nb3Sn onto 2.6 GHz Nb SRF cavities. After optimizing the deposition conditions in a mock-…
First Results From Nanoindentation of Vapor Diffused Nb3Sn Films on Nb
U. Pudasaini, G. V. Eremeev, S. Cheban
The mechanical vulnerability of the Nb3Sn-coated cavities is identified as one of the significant technical hurdles toward deploying them in practical accelerator applications in t…
Flux Expulsion and Material Properties of Niobium Explored in 644-650 MHz Cavities
K. McGee, S-H. Kim, P. Ostroumov +5
Upcoming projects requiring high-Q ~650 MHz medium-to-high- elliptical cavities drive a need to understand magnetic RF loss mechanisms and mitigations in greater detail. High-te…
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…
Validation of the 650 MHZ SRF tuner on the low and high beta cavities for PIP-II at 2 K*
C. Contreras-Martinez, S. Chandrasekaran, S. Cheban +7
The PIP-II linac will include thirty-six beta=0.61 and twenty-four beta=0.92 650 MHz 5 cell elliptical SRF cavities. Each cavity will be equipped with a tuning system consisting of…
Key directions for research and development of superconducting radio frequency cavities
S. Belomestnykh, S. Posen, D. Bafia +53
Radio frequency superconductivity is a cornerstone technology for many future HEP particle accelerators and experiments from colliders to proton drivers for neutrino facilities to…
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…
Plasma Processing for In-Situ Field Emission Mitigation of Superconducting Radiofrequency (SRF) Cryomodules
M. Martinello, P. Berrutti, B. Giaccone +14
Field emission (FE) is one of the main limiting factors of superconducting radio-frequency (SRF) cavities operating in accelerators and it occurs whenever contaminants, like dust,…
Nb3Sn Superconducting Radiofrequency Cavities: a Maturing Technology for Particle Accelerators and Detectors
S. Posen, M. Liepe, G. Eremeev +2
Nb3Sn superconducting radiofrequency (SRF) cavities have substantial potential for enabling new performance capabilities for particle accelerators for high energy physics (HEP), as…
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…
Q-factor optimization for high-beta 650 MHz cavities for PIP-II
M. Martinello, D. J. Bice, C. Boffo +8
High Q-factors are of utmost importance to minimize losses of superconducting radio-frequency cavities deployed in continuous wave particle accelerators. This study elucidates the…
Effect of substrate temperature on the growth of Nb3Sn film on Nb by multilayer sputtering
Md Nizam Sayeed, Uttar Pudasaini, Charles E. Reece +2
Nb3Sn films were fabricated by multilayer sequential sputtering on Nb at substrate temperatures ranging from room temperature to 250 °C. The multilayers were then annealed inside a…
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…
Properties of Nb3Sn films fabricated by magnetron sputtering from a single target
Md. Nizam Sayeed, Uttar Pudasaini, Charles E. Reece +2
Superconducting Nb3Sn films were fabricated on sapphire and fine grain Nb substrates by magnetron sputtering from a single stoichiometric Nb3Sn target. The structural, morphologica…
Effect of layer thickness on structural, morphological and superconducting properties of NbSn films fabricated by multilayer sequential sputtering
Md Nizam Sayeed, Uttar Pudasaini, Charles E Reece +2
Superconducting Nb3Sn films can be synthesized by controlling the atomic concentration of Sn. Multilayer sequential sputtering of Nb and Sn thin films followed by high temperature…
Nb3Sn multicell cavity coating system at JLAB
G. Eremeev, W. Clemens, K. Macha +5
SRF niobium cavities are the building blocks of modern accelerators for scientific applications. Lower surface resistance, higher fields, and high operating temperatures advance th…
Analysis of RF losses and material characterization of samples removed from a Nb3Sn-coated superconducting RF cavity
Uttar Pudasaini, Grigory V. Eremeev, Charles E. Reece +2
Nb3Sn (Tc ~ 18 K and Hsh ~ 400 mT) is a prospective material to replace Nb (Tc ~ 9 K and Hsh ~ 200 mT) in SRF accelerator cavities for significant cost reduction and performance en…
Initial Growth Of Tin On Niobium For Vapor Diffusion Coating Of Nb3sn
Uttar Pudasaini, Grigory Eremeev, Charles Reece +2
Nb3Sn has the potential to achieve superior performance in terms of quality factor, accelerating gradient and operating temperature (4.2 K vs 2 K) resulting in significant reductio…