SRF2023 - List of Authors (Turner, D.A.)

Paper	Title	Page
MOPMB012	Investigation, Using Nb Foils to Characterise the Optimal Dimensions of Samples Measured by the Magnetic Field Penetration Facility	88
	L.G.P. Smith, D.A. Turner STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom G. Burt, O.B. Malyshev, D.A. Turner Cockcroft Institute, Warrington, Cheshire, United Kingdom G. Burt Lancaster University, Lancaster, United Kingdom T. Junginger TRIUMF, Vancouver, Canada T. Junginger UVIC, Victoria, Canada O.B. Malyshev STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
	SRF cavities made of bulk Nb are reaching their theoretical limits in the maximum accelerating gradient, E_acc, where E_acc is limited by the maximum magnetic field, Bmax, that can be applied on the surface of the accelerating cavity wall. To increase E_acc, Bmax, which can be applied to the surface, must also be increased. The A15 materials or multilayer structures are the potential solution to increase Bmax. Since coating and RF testing of full size RF cavities is both expensive and time consuming, one need to evaluate new ideas in superconducting thin films quickly and at low cost. A magnetic field penetration experiment has been designed and built at Daresbury Laboratory to test small superconducting samples. The facility produces a parallel DC magnetic field, which applied from one side of the sample to the other similar to that in an RF cavity. The facility applies an increasing magnetic field at a set temperature to determine the field of full flux penetration which can give an insight into the quality and structure of the superconducting structure. The facility has been characterised using both type I and II superconductors and is now producing results from novel materials.
DOI •	reference for this paper ※ doi:10.18429/JACoW-SRF2023-MOPMB012
About •	Received ※ 18 June 2023 — Revised ※ 22 June 2023 — Accepted ※ 26 June 2023 — Issue date ※ 17 July 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WECAA01	Progress in European Thin Film Activities	607
	C. Pira, O. Azzolini, R. Caforio, E. Chyhyrynets, D. Fonnesu, D. Ford, V.A. Garcia, G. Keppel, G. Marconato, A. Salmaso, F. Stivanello INFN/LNL, Legnaro (PD), Italy C.Z. Antoine, Y. Kalboussi, Th. Proslier CEA-IRFU, Gif-sur-Yvette, France C. Benjamin, O.B. Malyshev, N. Marks, B.S. Sian, R. Valizadeh STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom C. Benjamin, J.W. Bradley, G. Burt, O.B. Malyshev, N. Marks, D.J. Seal, B.S. Sian, S. Simon, D.A. Turner, R. Valizadeh Cockcroft Institute, Warrington, Cheshire, United Kingdom S. Berry CEA-DRF-IRFU, France R. Berton, D. Piccoli, F. Piccoli, G. Squizzato, F. Telatin Piccoli, Noale (VE), Italy M. Bertucci, R. Paparella INFN/LASA, Segrate (MI), Italy M. Bonesso, S. Candela, V. Candela, R. Dima, G. Favero, A. Pepato, P. Rebesan, M. Romanato INFN- Sez. di Padova, Padova, Italy J.W. Bradley, S. Simon The University of Liverpool, Liverpool, United Kingdom G. Burt, D.J. Seal, D.A. Turner Lancaster University, Lancaster, United Kingdom O. Hryhorenko, D. Longuevergne Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France X. Jiang, T. Staedler, A.O. Zubtsovskii University Siegen, Siegen, Germany S. Keckert, J. Knobloch, O. Kugeler HZB, Berlin, Germany J. Knobloch University of Siegen, Siegen, Germany N.L. Leicester Cockcroft Institute, Lancaster University, Lancaster, United Kingdom A. Medvids, A. Mychko, P. Onufrijevs Riga Technical University, Riga, Latvia S. Prucnal, S. Zhou HZDR, Dresden, Germany R. Ries Slovak Academy of Sciences, Institute of Electrical Engineering, Bratislava, Slovak Republic E. Seiler IEE, Bratislava, Slovak Republic L.G.P. Smith STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom A-M. Valente-Feliciano JLab, Newport News, Virginia, USA
	Funding: This project has received funding from the European Union s Horizon 2020 Research and Innovation programme under Grant Agreement No 101004730. 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.
	Slides WECAA01 [15.846 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-SRF2023-WECAA01
About •	Received ※ 18 June 2023 — Revised ※ 24 June 2023 — Accepted ※ 02 September 2023 — Issue date ※ 02 September 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPMB003	Flux Expulsion Lens: Concept and Measurements	56
	D.A. Turner European Organization for Nuclear Research (CERN), Geneva, Switzerland A. Gallifa Terricabras, T. Koettig, A. Macpherson, G.J. Rosaz, N. Stapley CERN, Meyrin, Switzerland I. González Díaz-Palacio University of Hamburg, Hamburg, Germany W. Hillert University of Hamburg, Institut für Experimentalphysik, Hamburg, Germany M. Wenskat DESY, Hamburg, Germany
	A magnetic flux expulsion lens (MFEL) has been designed and built at CERN. This device uses closed topology conduction cooling of samples to quantify magnetic flux expulsion of superconductors, and allows for systematic measurements of the cooling dynamics and the magnetic response during the superconducting transition. Measurements for bulk Nb, cold worked Nb, sputtered Nb on Cu, and SIS multilayer structures are given. Preliminary results for both sample characterization of expulsion dynamics, and observation of an enhanced flux expulsion in SIS samples are also reported.
	Poster MOPMB003 [2.459 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-SRF2023-MOPMB003
About •	Received ※ 27 June 2023 — Revised ※ 28 June 2023 — Accepted ※ 30 June 2023 — Issue date ※ 14 July 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Investigation, Using Nb Foils to Characterise the Optimal Dimensions of Samples Measured by the Magnetic Field Penetration Facility

88

L.G.P. Smith, D.A. Turner
STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
G. Burt, O.B. Malyshev, D.A. Turner
Cockcroft Institute, Warrington, Cheshire, United Kingdom
G. Burt
Lancaster University, Lancaster, United Kingdom
T. Junginger
TRIUMF, Vancouver, Canada
T. Junginger
UVIC, Victoria, Canada
O.B. Malyshev
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom

SRF cavities made of bulk Nb are reaching their theoretical limits in the maximum accelerating gradient, E_acc, where E_acc is limited by the maximum magnetic field, Bmax, that can be applied on the surface of the accelerating cavity wall. To increase E_acc, Bmax, which can be applied to the surface, must also be increased. The A15 materials or multilayer structures are the potential solution to increase Bmax. Since coating and RF testing of full size RF cavities is both expensive and time consuming, one need to evaluate new ideas in superconducting thin films quickly and at low cost. A magnetic field penetration experiment has been designed and built at Daresbury Laboratory to test small superconducting samples. The facility produces a parallel DC magnetic field, which applied from one side of the sample to the other similar to that in an RF cavity. The facility applies an increasing magnetic field at a set temperature to determine the field of full flux penetration which can give an insight into the quality and structure of the superconducting structure. The facility has been characterised using both type I and II superconductors and is now producing results from novel materials.

DOI •

reference for this paper ※ doi:10.18429/JACoW-SRF2023-MOPMB012

About •

Received ※ 18 June 2023 — Revised ※ 22 June 2023 — Accepted ※ 26 June 2023 — Issue date ※ 17 July 2023

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WECAA01

Progress in European Thin Film Activities

607

C. Pira, O. Azzolini, R. Caforio, E. Chyhyrynets, D. Fonnesu, D. Ford, V.A. Garcia, G. Keppel, G. Marconato, A. Salmaso, F. Stivanello
INFN/LNL, Legnaro (PD), Italy
C.Z. Antoine, Y. Kalboussi, Th. Proslier
CEA-IRFU, Gif-sur-Yvette, France
C. Benjamin, O.B. Malyshev, N. Marks, B.S. Sian, R. Valizadeh
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
C. Benjamin, J.W. Bradley, G. Burt, O.B. Malyshev, N. Marks, D.J. Seal, B.S. Sian, S. Simon, D.A. Turner, R. Valizadeh
Cockcroft Institute, Warrington, Cheshire, United Kingdom
S. Berry
CEA-DRF-IRFU, France
R. Berton, D. Piccoli, F. Piccoli, G. Squizzato, F. Telatin
Piccoli, Noale (VE), Italy
M. Bertucci, R. Paparella
INFN/LASA, Segrate (MI), Italy
M. Bonesso, S. Candela, V. Candela, R. Dima, G. Favero, A. Pepato, P. Rebesan, M. Romanato
INFN- Sez. di Padova, Padova, Italy
J.W. Bradley, S. Simon
The University of Liverpool, Liverpool, United Kingdom
G. Burt, D.J. Seal, D.A. Turner
Lancaster University, Lancaster, United Kingdom
O. Hryhorenko, D. Longuevergne
Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
X. Jiang, T. Staedler, A.O. Zubtsovskii
University Siegen, Siegen, Germany
S. Keckert, J. Knobloch, O. Kugeler
HZB, Berlin, Germany
J. Knobloch
University of Siegen, Siegen, Germany
N.L. Leicester
Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
A. Medvids, A. Mychko, P. Onufrijevs
Riga Technical University, Riga, Latvia
S. Prucnal, S. Zhou
HZDR, Dresden, Germany
R. Ries
Slovak Academy of Sciences, Institute of Electrical Engineering, Bratislava, Slovak Republic
E. Seiler
IEE, Bratislava, Slovak Republic
L.G.P. Smith
STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
A-M. Valente-Feliciano
JLab, Newport News, Virginia, USA

Funding: This project has received funding from the European Union s Horizon 2020 Research and Innovation programme under Grant Agreement No 101004730.
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.

Slides WECAA01 [15.846 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-SRF2023-WECAA01

About •

Received ※ 18 June 2023 — Revised ※ 24 June 2023 — Accepted ※ 02 September 2023 — Issue date ※ 02 September 2023

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPMB003

Flux Expulsion Lens: Concept and Measurements

56

D.A. Turner
European Organization for Nuclear Research (CERN), Geneva, Switzerland
A. Gallifa Terricabras, T. Koettig, A. Macpherson, G.J. Rosaz, N. Stapley
CERN, Meyrin, Switzerland
I. González Díaz-Palacio
University of Hamburg, Hamburg, Germany
W. Hillert
University of Hamburg, Institut für Experimentalphysik, Hamburg, Germany
M. Wenskat
DESY, Hamburg, Germany

A magnetic flux expulsion lens (MFEL) has been designed and built at CERN. This device uses closed topology conduction cooling of samples to quantify magnetic flux expulsion of superconductors, and allows for systematic measurements of the cooling dynamics and the magnetic response during the superconducting transition. Measurements for bulk Nb, cold worked Nb, sputtered Nb on Cu, and SIS multilayer structures are given. Preliminary results for both sample characterization of expulsion dynamics, and observation of an enhanced flux expulsion in SIS samples are also reported.

Poster MOPMB003 [2.459 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-SRF2023-MOPMB003

About •

Received ※ 27 June 2023 — Revised ※ 28 June 2023 — Accepted ※ 30 June 2023 — Issue date ※ 14 July 2023

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)