TY  - CONF
AU  - Leicester, N.L.
AU  - Burt, G.
AU  - Chyhyrynets, E.
AU  - Conlon, J.A.
AU  - Malyshev, O.B.
AU  - Marks, H.S.
AU  - Pira, C.
AU  - Seal, D.J.
AU  - Sian, B.S.
AU  - Valizadeh, R.
ED  - Saito, Kenji
ED  - Xu, Ting
ED  - Sakamoto, Naruhiko
ED  - Schaa, Volker R.W.
ED  - Thomas, Paul W.
TI  - Development and Testing of Split 6 GHz Cavities With Niobium Coatings
J2  - Proc. of SRF2023, Grand Rapids, MI, USA, 25-30 June 2023
CY  - Grand Rapids, MI, USA
T2  - International Conference on RF Superconductivity
T3  - 21
LA  - english
AB  - Superconducting thin-films on a copper substrate are used in accelerator RF cavities as an alternative to bulk Nb due to the high thermal conductivity of copper and the lower production costs. Although thin-film coated RF cavities can match, or even exceed the performance of bulk Nb, there are some challenges around the deposition. The RF cavities are often produced as two half-cells with a weld across the centre where the RF surface current is highest, which could reduce cavity performance. To avoid this, a cavity can be produced in 2 longitudinally split halves, with the join parallel to the surface current. As the current doesn’t cross the join a simpler weld can be performed far from the fields, simplifying the manufacturing process, and potentially improving the cavities performance. This additionally allows for different deposition techniques and coating materials to be used, as well as easier post-deposition quality control. This paper discusses the development and testing of 6 GHz cavities that have been designed and coated at the Cockcroft Institute, using low temperature RF techniques to characterise cavities with different substrate preparations and coating techniques.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 51
EP  - 55
KW  - cavity
KW  - SRF
KW  - coupling
KW  - target
KW  - site
DA  - 2023/09
PY  - 2023
SN  - 2673-5504
SN  - 978-3-95450-234-9
DO  - doi:10.18429/JACoW-SRF2023-MOPMB001
UR  - https://jacow.org/srf2023/papers/mopmb001.pdf
ER  - 

TY  - CONF
AU  - Chyhyrynets, E.
AU  - Azzolini, O.
AU  - Caforio, R.
AU  - Fonnesu, D.
AU  - Ford, D.
AU  - Keppel, G.
AU  - Marconato, G.
AU  - Pira, C.
AU  - Salmaso, A.
AU  - Stivanello, F.
ED  - Saito, Kenji
ED  - Xu, Ting
ED  - Sakamoto, Naruhiko
ED  - Schaa, Volker R.W.
ED  - Thomas, Paul W.
TI  - Plasma Electrolytic Polishing Technology Progress Development for Nb and Cu Substrates Preparation
J2  - Proc. of SRF2023, Grand Rapids, MI, USA, 25-30 June 2023
CY  - Grand Rapids, MI, USA
T2  - International Conference on RF Superconductivity
T3  - 21
LA  - english
AB  - Superconducting radio frequency (SRF) cavity performance is highly dependent on surface preparation. Conventionally, electropolishing (EP) is used to achieve a clean surface and low roughness for both Nb and Cu substrates, but it requires harsh and corrosive solutions like concentrated acids. Plasma Electrolytic Polishing (PEP) is a promising alternative that uses only diluted salt solutions and has several advantages over EP. PEP can replace intermediate steps like mechanical or chemical polishing, thanks to its superior removal rate of up to 2-8 um/min of Nb and 3-30 um/min of Cu. It achieves Ra roughness of 100 nm for both substrates and has a higher smoothing effect than EP. PEP is also suitable for normal conducting cavities and other accelerator components, including couplers. We demonstrate the effectiveness of PEP on SRF substrates and analyse substrate defect evaluation. We demonstrate the application of PEP onto SRF substrates and analyse the substrate’s defect evaluation. The ongoing work includes Nb bulk and Nb on Cu QPR treatments and RF tests in collaboration with HZB.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 75
EP  - 79
KW  - cavity
KW  - cathode
KW  - plasma
KW  - experiment
KW  - SRF
DA  - 2023/09
PY  - 2023
SN  - 2673-5504
SN  - 978-3-95450-234-9
DO  - doi:10.18429/JACoW-SRF2023-MOPMB009
UR  - https://jacow.org/srf2023/papers/mopmb009.pdf
ER  - 

TY  - CONF
AU  - Fonnesu, D.
AU  - Azzolini, O.
AU  - Caforio, R.
AU  - Chyhyrynets, E.
AU  - Ford, D.
AU  - Garcia, V.A.
AU  - Keppel, G.
AU  - Marconato, G.
AU  - Pira, C.
AU  - Salmaso, A.
AU  - Stivanello, F.
ED  - Saito, Kenji
ED  - Xu, Ting
ED  - Sakamoto, Naruhiko
ED  - Schaa, Volker R.W.
ED  - Thomas, Paul W.
TI  - Influence of the Coating Parameters on the Tc of Nb₃Sn Thin Films on Copper Deposited via DC Magnetron Sputtering
J2  - Proc. of SRF2023, Grand Rapids, MI, USA, 25-30 June 2023
CY  - Grand Rapids, MI, USA
T2  - International Conference on RF Superconductivity
T3  - 21
LA  - english
AB  - The I.FAST collaboration aims at pushing the performance of particle accelerators by developing sustainable innovative technologies. Among its goals, the development of thin film-coated copper elliptical accelerating cavities covers both the optimization of the manufacturing of seamless substrates and the development of functional coatings able to conform to the 3D cavity geometry while delivering the needed performance. For the latter, the optimization of the deposition recipe is central to a successful outcome. The work presented here focuses on the deposition of Nb₃Sn films on flat, small copper samples. The films are deposited via DCMS from a planar stoichiometric Nb₃Sn commercial target. The results of the film characterization are presented here. The observed dependencies between the film properties and, in particular, Tc(90%-10%) = (17.9±0.1)K is reported for Nb₃Sn on sapphire and Tc(90%-10%) = (16.9±0.2)K for Nb₃Sn on copper with a 30 micron thick niobium buffer layer.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 92
EP  - 95
KW  - site
KW  - niobium
KW  - cavity
KW  - SRF
KW  - cathode
DA  - 2023/09
PY  - 2023
SN  - 2673-5504
SN  - 978-3-95450-234-9
DO  - doi:10.18429/JACoW-SRF2023-MOPMB013
UR  - https://jacow.org/srf2023/papers/mopmb013.pdf
ER  - 

TY  - CONF
AU  - Marconato, G.
AU  - Alesini, D.
AU  - Azzolini, O.
AU  - Braggio, C.
AU  - Caforio, R.
AU  - Chyhyrynets, E.
AU  - D’Agostino, D.
AU  - D’Elia, A.
AU  - Di Gioacchino, D.
AU  - Fonnesu, D.
AU  - Ford, D.
AU  - Gambardella, U.
AU  - Garcia, V.A.
AU  - Gatti, C.
AU  - Keppel, G.
AU  - Ligi, C.
AU  - Maccarrone, G.
AU  - Pira, C.
AU  - Posen, S.
AU  - Rettaroli, A.
AU  - Salmaso, A.
AU  - Stivanello, F.
AU  - Tocci, S.
ED  - Saito, Kenji
ED  - Xu, Ting
ED  - Sakamoto, Naruhiko
ED  - Schaa, Volker R.W.
ED  - Thomas, Paul W.
TI  - NbTi Thin Film SRF Cavities for Dark Matter Search
J2  - Proc. of SRF2023, Grand Rapids, MI, USA, 25-30 June 2023
CY  - Grand Rapids, MI, USA
T2  - International Conference on RF Superconductivity
T3  - 21
LA  - english
AB  - The search for dark matter is now looking at ALPs (axion-like particles) as a very promising candidate to understand our universe. Within this framework, we explore the possibility to use NbTi thin film coatings on Cu resonating cavities to investigate the presence of axions in the range of 35-45 µeV mass by coupling the axion to a very strong magnetic field inside the cavity, causing its conversion to a photon which is subsequently detected. In this work the chemical treatments and DC magnetron sputtering details of the preparation of 9 GHz, 7 GHz, and 3.9 GHz resonant cavities and their quality factor measurements at different applied magnetic fields are presented.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 96
EP  - 99
KW  - cavity
KW  - target
KW  - SRF
KW  - photon
KW  - cryogenics
DA  - 2023/09
PY  - 2023
SN  - 2673-5504
SN  - 978-3-95450-234-9
DO  - doi:10.18429/JACoW-SRF2023-MOPMB014
UR  - https://jacow.org/srf2023/papers/mopmb014.pdf
ER  - 

TY  - CONF
AU  - Pira, C.
AU  - Antoine, C.Z.
AU  - Azzolini, O.
AU  - Benjamin, C.
AU  - Berry, S.
AU  - Berton, R.
AU  - Bertucci, M.
AU  - Bonesso, M.
AU  - Bradley, J.W.
AU  - Burt, G.
AU  - Caforio, R.
AU  - Candela, S.
AU  - Candela, V.
AU  - Chyhyrynets, E.
AU  - Dima, R.
AU  - Favero, G.
AU  - Fonnesu, D.
AU  - Ford, D.
AU  - Garcia, V.A.
AU  - Hryhorenko, O.
AU  - Jiang, X.
AU  - Kalboussi, Y.
AU  - Keckert, S.
AU  - Keppel, G.
AU  - Knobloch, J.
AU  - Kugeler, O.
AU  - Leicester, N.L.
AU  - Longuevergne, D.
AU  - Malyshev, O.B.
AU  - Marconato, G.
AU  - Marks, N.
AU  - Medvids, A.
AU  - Mychko, A.
AU  - Onufrijevs, P.
AU  - Paparella, R.
AU  - Pepato, A.
AU  - Piccoli, D.
AU  - Piccoli, F.
AU  - Proslier, Th.
AU  - Prucnal, S.
AU  - Rebesan, P.
AU  - Ries, R.
AU  - Romanato, M.
AU  - Salmaso, A.
AU  - Seal, D.J.
AU  - Seiler, E.
AU  - Sian, B.S.
AU  - Simon, S.
AU  - Smith, L.G.P.
AU  - Squizzato, G.
AU  - Staedler, T.
AU  - Stivanello, F.
AU  - Telatin, F.
AU  - Turner, D.A.
AU  - Valente-Feliciano, A-M.
AU  - Valizadeh, R.
AU  - Zhou, S.
AU  - Zubtsovskii, A.O.
ED  - Saito, Kenji
ED  - Xu, Ting
ED  - Sakamoto, Naruhiko
ED  - Schaa, Volker R.W.
ED  - Thomas, Paul W.
TI  - Progress in European Thin Film Activities
J2  - Proc. of SRF2023, Grand Rapids, MI, USA, 25-30 June 2023
CY  - Grand Rapids, MI, USA
T2  - International Conference on RF Superconductivity
T3  - 21
LA  - english
AB  - Thin-film cavities with higher Tc superconductors (SC) than Nb promise to move the operating temperature from 2 to 4.5 K with savings 3 orders of magnitude in cryogenic power consumption. Several European labs are coordinating their efforts to obtain a first 1.3 GHz cavity prototype through the I.FAST collaboration and other informal collaborations with CERN and DESY. R&D covers the entire production chain. In particular, new production techniques of seamless Copper and Niobium elliptical cavities via additive manufacturing are studied and evaluated. New acid-free polishing techniques to reduce surface roughness in a more sustainable way such as plasma electropolishing and metallographic polishing have been tested. Optimization of coating parameters of higher Tc SC than Nb (Nb₃Sn, V₃Si, NbTiN) via PVD and multilayer via ALD are on the way. Finally, rapid heat treatments such as Flash Lamp Annealing and Laser Annealing are used to avoid or reduce Cu diffusion in the SC film. The development and characterization of SC coatings is done on planar samples, 6 GHz cavities, choke cavities, QPR and 1.3 GHz cavities. This work presents the progress status of these coordinated efforts.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 607
EP  - 614
KW  - cavity
KW  - SRF
KW  - target
KW  - niobium
KW  - laser
DA  - 2023/09
PY  - 2023
SN  - 2673-5504
SN  - 978-3-95450-234-9
DO  - doi:10.18429/JACoW-SRF2023-WECAA01
UR  - https://jacow.org/srf2023/papers/wecaa01.pdf
ER  - 

TY  - CONF
AU  - Ford, D.
AU  - Chyhyrynets, E.
AU  - Fonnesu, D.
AU  - Keppel, G.
AU  - Marconato, G.
AU  - Pira, C.
AU  - Salmaso, A.
ED  - Saito, Kenji
ED  - Xu, Ting
ED  - Sakamoto, Naruhiko
ED  - Schaa, Volker R.W.
ED  - Thomas, Paul W.
TI  - Study and Improvements of Liquid Tin Diffusion Process to Synthesize Nb₃Sn Cylindrical Targets
J2  - Proc. of SRF2023, Grand Rapids, MI, USA, 25-30 June 2023
CY  - Grand Rapids, MI, USA
T2  - International Conference on RF Superconductivity
T3  - 21
LA  - english
AB  - Nb₃Sn thin films on bulk Nb cavities exhibit comparable performance to bulk Nb at lower temperatures, and using Cu as a substrate material can further improve performance and reduce costs. However, coating substrates with curved geometries like elliptical cavities can be challenging due to the brittleness of Nb₃Sn targets produced by a classical sintering technique. This work explores the use of the Liquid Tin Diffusion (LTD) technique to produce sputtering targets for 6 GHz elliptical cavities, which allows for the deposition of thick and uniform coatings on Nb substrate, even for complex geometries. The study includes improvements in the LTD process and the production of a single-use LTD target, as well as the characterization of Nb₃Sn films coated by DC magnetron sputtering using these innovative targets.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 868
EP  - 871
KW  - target
KW  - niobium
KW  - simulation
KW  - experiment
KW  - cavity
DA  - 2023/09
PY  - 2023
SN  - 2673-5504
SN  - 978-3-95450-234-9
DO  - doi:10.18429/JACoW-SRF2023-WEPWB118
UR  - https://jacow.org/srf2023/papers/wepwb118.pdf
ER  - 

TY  - CONF
AU  - Ford, D.
AU  - Bonesso, M.
AU  - Caforio, R.
AU  - Candela, S.
AU  - Candela, V.
AU  - Chyhyrynets, E.
AU  - Dima, R.
AU  - Favero, G.
AU  - Keppel, G.
AU  - Pepato, A.
AU  - Pira, C.
AU  - Pozzi, M.
AU  - Rebesan, P.
AU  - Romanato, M.
ED  - Saito, Kenji
ED  - Xu, Ting
ED  - Sakamoto, Naruhiko
ED  - Schaa, Volker R.W.
ED  - Thomas, Paul W.
TI  - Additive Manufacturing of Pure Niobium and Copper Using Laser Powder Bed Fusion for Particle Accelerator Applications
J2  - Proc. of SRF2023, Grand Rapids, MI, USA, 25-30 June 2023
CY  - Grand Rapids, MI, USA
T2  - International Conference on RF Superconductivity
T3  - 21
LA  - english
AB  - In this study, Metal Additive Manufacturing (MAM) was evaluated as a viable method for producing seamless 6 GHz pure copper and niobium prototypes without the use of internal supports. Preliminary tests were performed to evaluate printability, leading to further investigations into surface treatments to reduce surface roughness from 35 µm to less than 1 µm. Additional prototypes were printed using different powders and machines, exploring various printing parameters and innovative contactless supporting structures to improve the quality of downward-facing surfaces with small inclination angles. These structures enabled the fabrication of seamless SRF cavities with a relative density greater than 99.8%. Quality testing was conducted using techniques such as tomography, leak testing, resonant frequency assessment, and internal inspection. The results of this study are presented herein.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 872
EP  - 875
KW  - cavity
KW  - niobium
KW  - laser
KW  - SRF
KW  - plasma
DA  - 2023/09
PY  - 2023
SN  - 2673-5504
SN  - 978-3-95450-234-9
DO  - doi:10.18429/JACoW-SRF2023-WEPWB119
UR  - https://jacow.org/srf2023/papers/wepwb119.pdf
ER  - 

TY  - CONF
AU  - Chang, W.
AU  - Choi, Y.
AU  - Du, X.J.
AU  - Facco, A.
AU  - Hartung, W.
AU  - Kim, S.H.
AU  - Konomi, T.
AU  - Kunjir, S.R.
AU  - Nguyen, H.
AU  - Saito, K.
AU  - Xu, T.
AU  - Zhao, S.
ED  - Saito, Kenji
ED  - Xu, Ting
ED  - Sakamoto, Naruhiko
ED  - Schaa, Volker R.W.
ED  - Thomas, Paul W.
TI  - Automation of FRIB SRF Cavities and SC Solenoids Turn-on/off
J2  - Proc. of SRF2023, Grand Rapids, MI, USA, 25-30 June 2023
CY  - Grand Rapids, MI, USA
T2  - International Conference on RF Superconductivity
T3  - 21
LA  - english
AB  - The superconducting driver Linac for the Facility for Rare Isotope Beams (FRIB) is a heavy ion accelerator that accelerate ions to 200 MeV per nucleon. The Linac has 46 cryomodules that contain 324 superconducting radio frequency (SRF) cavities and 69 superconducting (SC) solenoid packages. For operation of all cryomodules with high efficiency and reliability, automation for SRF cavity and SC solenoid fast turn-on/off is essentially. Based on cryomodule commissioning results and expert experience, all manual cavity and solenoid turn-on/off procedures and steps have been replaced by automatic programs for FRIB linac operation. This allows the operators to turn the systems on and off without expert-level training. Automation reduces the risk of human error, speeds up beam recovery after user access to experimental areas, and increases beam availability. The cavity turn-on procedure makes sure that the cavity can operate at low field with expected read backs, ramps up the field, and makes sure that the RF amplitude and phase are stable. The design, implementation, and operating experience with automation will be presented.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 999
EP  - 1002
KW  - cavity
KW  - cryomodule
KW  - solenoid
KW  - SRF
KW  - linac
DA  - 2023/09
PY  - 2023
SN  - 2673-5504
SN  - 978-3-95450-234-9
DO  - doi:10.18429/JACoW-SRF2023-FRIBA05
UR  - https://jacow.org/srf2023/papers/friba05.pdf
ER  -