245 citations · 1.7k across the 70 of their papers we have counts for
34 papers · 1 filter
Detection of high-frequency gravitational waves using SRF cavities
M. Wenskat, B. Giaccone, J. Branlard +21
Today, apart from some isolated R&D efforts, there are no gravitational wave (GW) experiments, yet which explore a large part of the vast frequency range above the LIGO/Virgo band.…
Exploration of Parameters That Affect High Field Q-Slope
K. Howard, Y. -K. Kim, D. Bafia +1
The onset of high field Q-slope (HFQS) around 25 MV/m prevents cavities in electropolished (EP) condition from reaching high quality factors at high gradients due to the precipitat…
The Collaborative Effects of Intrinsic and Extrinsic Impurities in Low RRR SRF Cavities
K. Howard, Y. -K. Kim, D. Bafia +1
The superconducting radio-frequency (SRF) community has shown that introducing certain impurities into high-purity niobium can improve quality factors and accelerating gradients. W…
HELEN: Traveling Wave SRF Linear Collider Higgs Factory
S. Belomestnykh, P. C. Bhat, A. Grassellino +7
Traveling wave SRF accelerating structures offer several advantages over the traditional standing wave structures: substantially lower and lower , ratios o…
HELEN: A Linear Collider Based On Advanced SRF Technology
S. Belomestnykh, P. C. Bhat, M. Checchin +9
This paper discusses recently proposed Higgs Energy LEptoN (HELEN) linear collider based on advances in superconducting radio frequency technology. The collider offers cost…
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…
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,…
Higgs-Energy LEptoN (HELEN) Collider based on advanced superconducting radio frequency technology
S. Belomestnykh, P. C. Bhat, A. Grassellino +15
This Snowmass 2021 contributed paper discusses a Higgs-Energy LEptoN (HELEN) linear collider based on advances superconducting radio frequency technology. The proposed col…
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…
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…
LCLS-II-HE verification cryomodule high gradient performance and quench behavior
S. Posen, A. Cravatta, M. Checchin +43
An 8-cavity, 1.3 GHz, LCLS-II-HE cryomodule was assembled and tested at Fermilab to verify performance before the start of production. Its cavities were processed with a novel nitr…
Signatures of Enhanced Superconducting Properties in Niobium Cavities
D. Bafia, A. Grassellino, M. Checchin +2
Superconducting radio-frequency (SRF) niobium cavities are critical for modern particle accelerators, as well as for advancing superconducting quantum systems and enabling ultra-se…
Field emission mitigation studies in LCLS-II cavities via in situ plasma processing
Bianca Giaccone, Martina Martinello, Paolo Berrutti +7
Field emission is one of the factors that can limit the performance of superconducting radio frequency cavities. In order to reduce possible field emission in LCLS-II (Linac Cohere…
High-Field Q-slope Mitigation due to Impurity Profile in Superconducting Radio-Frequency Cavities
Mattia Checchin, Anna Grassellino
In this study, we present new insights on the origin of the high-field Q-slope in superconducting radio-frequency cavities. Consequent hydrofluoric acid rinses are used to probe th…
Impact of high Q on ILC250 upgrade for record luminosities and path toward ILC380
H. Padamsee, A. Grassellino, S. Belomestnykh +1
In this paper, we address the possibility of upgrading the ILC250 luminosity to , so that with the polarization feature, the effective luminosity will be $2.0 \…
Ultra-Low Surface Resistance via Vacuum Heat Treatment of Superconducting Radiofrequency Cavities
S. Posen, A. Romanenko, A. Grassellino +2
We report on an effort to improve the performance of superconducting radiofrequency cavities by the use of heat treatment in a temperature range sufficient to dissociate the natura…
Low RF power plasma ignition and detection for in-situ cleaning of 1.3 GHz 9-cell cavities
P. Berrutti, B. Giaccone, M. Martinello +7
Superconducting Radio Frequency (SRF) cavities performance preservation is crucial, from vertical test to accelerator operation. Field Emission (FE) is still one of the performance…
Accelerating fields up to 49 MV/m in TESLA-shape superconducting RF niobium cavities via 75C vacuum bake
A. Grassellino, A. Romanenko, D. Bice +9
In this paper we present the discovery of a new surface treatment applied to superconducting radio frequency (SRF) niobium cavities, leading to unprecedented accelerating fields of…
Commissioning And First Results From The Fermilab Cryomodule Test Stand
E. R. Harms, M. Awida, C. Baffes +34
A new test stand dedicated to Superconducting Radiofrequency (SRF) cryomodule testing, CMTS1, has been commissioned and is now in operation at Fermilab. The first device to be cool…
The Effect of Mechanical Cold Work on the Magnetic Flux Expulsion of Niobium
S. Posen, S. K. Chandrasekaran, A. C. Crawford +5
Expulsion of ambient flux has been shown to be crucial to obtain high quality factors in bulk niobium SRF cavities. However, there remain many questions as to what properties of th…
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…
Advancement in the understanding of the field and frequency dependent microwave surface resistance of niobium
M. Martinello, S. Aderhold, S. K. Chandrasekaran +6
The radio-frequency surface resistance of niobium resonators is incredibly reduced when nitrogen impurities are dissolved as interstitial in the material, conferring ultra-high Q-f…
Unprecedented Quality Factors at Accelerating Gradients up to 45 MV/m in Niobium Superconducting Resonators via Low Temperature Nitrogen Infusion
A. Grassellino, A. Romanenko, Y. Trenikhina +9
We report the finding of new surface treatments that permit to manipulate the niobium resonator nitrogen content in the first few nanometers in a controlled way, and the resonator…
Effect of interstitial impurities on the field dependent microwave surface resistance of niobium
M. Martinello, A. Grassellino, M. Checchin +5
Previous work has demonstrated that the radio frequency surface resistance of niobium resonators is dramatically reduced when nitrogen impurities are dissolved as interstitial in t…