40 citations · 77 across the 12 of their papers we have counts for
12 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…
Development of 3-cell Traveling Wave SRF Cavity
F. Furuta, V. Yakovlev, T. Khabiboulline +3
Traveling wave SRF cavity is a new technology and requires a multi-stage process for development. Conceptual designs have been proposed to adopt TW resonance in an SRF cavity The e…
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…
Design, Manufacturing, Assembly, Testing, And Lessons Learned Of The Prototype 650 Mhz Couplers
J. Helsper, S. Chandrasekaran, N. Solyak +6
Six 650 MHz high-power couplers will be integrated into the prototype High Beta 650 MHz (HB650) cryomodule for the PIP-II project at Fermilab. The design of the coupler is describe…
Study on Electropolishing Conditions for 650 MHz Niobium SRF Cavity
V. Chouhan, D. Bice, F. Furuta +8
The PIP II linear accelerator includes different types of niobium SRF cavities including 650 MHz elliptical low (0.61) and high (0.92) beta cavities. The elliptical cavity surface…
Effect of Electropolishing on Nitrogen Doped and Undoped Niobium Surfaces
V. Chouhan, F. Furuta, M. Martinello +2
Cold electropolishing (EP) of a nitrogen-doped (N-doped) niobium (Nb) superconducting RF (SRF) cavity was found to improve its quality factor. In order to understand the effect 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…
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…
CBETA Design Report, Cornell-BNL ERL Test Accelerator
G. H. Hoffstaetter, D. Trbojevic, C. Mayes +51
This design report describes the construction plans for the world's first multi-pass SRF ERL. It is a 4-pass recirculating linac that recovers the beam's energy by 4 additional, de…
Field-dependent surface resistance of a superconducting RF cavity caused by surface impurity
M. Ge, F. Furuta, M. Liepe +1
Q-slope issue, which is caused by the field dependent surface resistance, puzzled people for a long time in SRF fields. In this paper, we related the Q-slope with surface treatment…
A temperature-mapping system for multi-cell SRF accelerating cavities
M. Ge, G. Hoffstaetter, F. Furuta +6
A Temperature mapping (T-map) system for Superconducting Radio Frequency (SRF) cavities consists of a thermometer array positioned precisely on an exterior cavity wall, capable of…
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…