SRF2015 - List of Keywords (scattering)

Paper	Title	Other Keywords	Page
TUPB040	High Power Impulse Magnetron Sputtering of Thin Films for Superconducting RF Cavities	power-supply, target, radio-frequency, vacuum	647
	S. Wilde, B. Chesca Loughborough University, Loughborough, Leicestershire, United Kingdom E. Alves Associação EURATOM/IST, Instituto de Plasmas e Fusão Nuclear, Lisboa, Portugal N.P. Barradas Universidade de Lisboa, Instituto Superior Técnico, Bobadela, Portugal A.N. Hannah, O.B. Malyshev, S.M. Pattalwar, R. Valizadeh STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom G.B.G. Stenning STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
	The production of superconducting coatings for radio frequency cavities is a rapidly developing field that should ultimately lead to acceleration gradients greater than those obtained by bulk Nb RF cavities. Optimizing superconducting properties of Nb and Nb compound thin-films is therefore essential. Nb films were deposited by magnetron sputtering in pulsed DC mode onto Si (100) and MgO (100) substrates and also by high impulse magnetron sputtering (HiPIMS) onto Si (100), MgO (100) and polycrystalline Cu. HiPIMS was then used to deposit NbN and NbTiN thin films onto Si(100) and polycrystalline Cu. The films were characterised using scanning electron microscopy, x-ray diffraction, DC SQUID magnetometry and Q factor for a flat thin film sample.
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TUPB042	Low Energy Muon Spin Rotation and Point Contact Tunneling Applied to Niobium Films for SRF Cavities	niobium, cavity, experiment, data-analysis	656
	T. Junginger TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada S. Calatroni, G. Terenziani CERN, Geneva, Switzerland T. Prokscha, Z. Salman, A. Suter PSI, Villigen PSI, Switzerland Th. Proslier ANL, Argonne, Illinois, USA G. Terenziani Sheffield University, Sheffield, United Kingdom J. Zasadzinski IIT, Chicago, Illinois, USA
	Muon spin rotation (muSR) and point contact tunneling (PCT) are used since several years for bulk niobium studies. Here we present studies on niobium thin film samples of different deposition techniques (diode, magnetron and HIPIMS) and compare the results with RF measurements and bulk niobium results. It is consistently found from muSR and RF measurements that HIPIMS can be used to produce thin films of high RRR. Hints for magnetism are especially found on the HIPIMS samples. These could possibly contribute to the field dependent losses of superconducting cavities, which are strongly pronounced on niobium on copper cavities.
	Poster TUPB042 [0.932 MB]
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THPB046	Design and Development of Superconducting Spoke Cavity for Compact Photon Source	cavity, laser, photon, simulation	1196
	M. Sawamura Japan Atomic Energy Agency (JAEA), Gamma-ray Non-Destructive Assay Research Group, Tokai-mura, Ibaraki-ken, Japan E. Cenni CEA/IRFU, Gif-sur-Yvette, France R. Hajima JAEA, Ibaraki-ken, Japan H. Hokonohara, Y. Iwashita, H. Tongu Kyoto ICR, Uji, Kyoto, Japan T. Kubo, T. Saeki KEK, Ibaraki, Japan
	Funding: This study is supported by Photon and Quantum Basic Research Coordinated Development Program of MEXT, Japan. The spoke cavity is expected to have advantages for compact ERL accelerator for X-ray source based on laser Compton scattering. We have been developing the spoke cavity under a research program of MEXT, Japan to establish the fabrication process. Since our designed shape of the spoke cavity is complicated due to increase the RF properties, we have been designing the mold including the process of press work and the support parts for vacuum tolerance with the mechanical simulation. In this paper we present status of the spoke cavity fabrication.
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Paper

Title

Other Keywords

Page

TUPB040

High Power Impulse Magnetron Sputtering of Thin Films for Superconducting RF Cavities

power-supply, target, radio-frequency, vacuum

647

S. Wilde, B. Chesca
Loughborough University, Loughborough, Leicestershire, United Kingdom
E. Alves
Associação EURATOM/IST, Instituto de Plasmas e Fusão Nuclear, Lisboa, Portugal
N.P. Barradas
Universidade de Lisboa, Instituto Superior Técnico, Bobadela, Portugal
A.N. Hannah, O.B. Malyshev, S.M. Pattalwar, R. Valizadeh
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
G.B.G. Stenning
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom

The production of superconducting coatings for radio frequency cavities is a rapidly developing field that should ultimately lead to acceleration gradients greater than those obtained by bulk Nb RF cavities. Optimizing superconducting properties of Nb and Nb compound thin-films is therefore essential. Nb films were deposited by magnetron sputtering in pulsed DC mode onto Si (100) and MgO (100) substrates and also by high impulse magnetron sputtering (HiPIMS) onto Si (100), MgO (100) and polycrystalline Cu. HiPIMS was then used to deposit NbN and NbTiN thin films onto Si(100) and polycrystalline Cu. The films were characterised using scanning electron microscopy, x-ray diffraction, DC SQUID magnetometry and Q factor for a flat thin film sample.

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reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)

TUPB042

Low Energy Muon Spin Rotation and Point Contact Tunneling Applied to Niobium Films for SRF Cavities

niobium, cavity, experiment, data-analysis

656

T. Junginger
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
S. Calatroni, G. Terenziani
CERN, Geneva, Switzerland
T. Prokscha, Z. Salman, A. Suter
PSI, Villigen PSI, Switzerland
Th. Proslier
ANL, Argonne, Illinois, USA
G. Terenziani
Sheffield University, Sheffield, United Kingdom
J. Zasadzinski
IIT, Chicago, Illinois, USA

Muon spin rotation (muSR) and point contact tunneling (PCT) are used since several years for bulk niobium studies. Here we present studies on niobium thin film samples of different deposition techniques (diode, magnetron and HIPIMS) and compare the results with RF measurements and bulk niobium results. It is consistently found from muSR and RF measurements that HIPIMS can be used to produce thin films of high RRR. Hints for magnetism are especially found on the HIPIMS samples. These could possibly contribute to the field dependent losses of superconducting cavities, which are strongly pronounced on niobium on copper cavities.

Poster TUPB042 [0.932 MB]

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reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)

THPB046

Design and Development of Superconducting Spoke Cavity for Compact Photon Source

cavity, laser, photon, simulation

1196

M. Sawamura
Japan Atomic Energy Agency (JAEA), Gamma-ray Non-Destructive Assay Research Group, Tokai-mura, Ibaraki-ken, Japan
E. Cenni
CEA/IRFU, Gif-sur-Yvette, France
R. Hajima
JAEA, Ibaraki-ken, Japan
H. Hokonohara, Y. Iwashita, H. Tongu
Kyoto ICR, Uji, Kyoto, Japan
T. Kubo, T. Saeki
KEK, Ibaraki, Japan

Funding: This study is supported by Photon and Quantum Basic Research Coordinated Development Program of MEXT, Japan.
The spoke cavity is expected to have advantages for compact ERL accelerator for X-ray source based on laser Compton scattering. We have been developing the spoke cavity under a research program of MEXT, Japan to establish the fabrication process. Since our designed shape of the spoke cavity is complicated due to increase the RF properties, we have been designing the mold including the process of press work and the support parts for vacuum tolerance with the mechanical simulation. In this paper we present status of the spoke cavity fabrication.

Export •

reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)