NDLI: Niobium Coating of Cavities Using Cathodic Arc

Content Provider	IEEE Xplore Digital Library
Author	Russo, R. Catani, L. Cianchi, A. DiGiovenale, D. Lorkiewicz, J. Tazzari, S. Granata, C. Ventrella, P. Lamura, G. Andreone, A.
Copyright Year	2002
Abstract	Niobium thin film coated copper RF cavities are an interesting alternative to niobium bulk cavities for the development of high performance superconducting accelerators. The main limiting factor in their use is the degradation of the quality factor Q with increasing accelerating field (the ldquoQ-Sloperdquo). To try and overcome this limitation, we have developed an alternative coating technique based on a Cathodic Arc system working under UHV conditions (UHVCA). High quality Nb samples have been synthesized under different deposition angles and their characteristics are presented. The UHVCA technique has been used to deposit 1.3 GHz TESLA-type single cell cavities. To further improve cavity performance the first critical field has to be enhanced. The use of multilayers consisting of alternating insulating and superconducting layers may produce the desired enhancement providing that the superconducting layer thickness is smaller than the London penetration depth. To this aim, we present also the experimental characterization of the superconducting properties (T_C, B_C1) of Nb/AlOx/Nb multilayers.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1394
Ending Page	1398
Page Count	5
File Size	577230
File Format	PDF
ISSN	10518223
Volume Number	19
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Niobium Coatings Superconducting epitaxial layers Nonhomogeneous media Superconducting thin films Copper Radio frequency Degradation Q factor Acceleration thin films Arc discharges multilayer superconducting cavity resonators
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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Magnetic Shielding Larger Than the Lower Critical Field of Niobium in Multilayers

Diplexer Design Implementing Highly Miniaturized Multilayer Superconducting Hybrids and Filters

Enhancement in Quality Factor of SRF Niobium Cavities by Material Diffusion

Superconducting 500 MHz accelerating copper cavities sputter-coated with niobium films

Metallurgical analysis and RF losses in superconducting niobium thin film cavities

New directions in superconducting radio frequency cavities for accelerators

Estimation of surface resistance for epitaxial NbN films in the frequency range of 0.1-1.1 THz

Purity of Nb and Pb Films Deposited by an Ultrahigh Vacuum Cathodic Arc

Study of the surface resistance of niobium sputter-coated copper cavities

Niobium Coating of Cavities Using Cathodic Arc

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Magnetic Shielding Larger Than the Lower Critical Field of Niobium in Multilayers

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Enhancement in Quality Factor of SRF Niobium Cavities by Material Diffusion

Superconducting 500 MHz accelerating copper cavities sputter-coated with niobium films

Metallurgical analysis and RF losses in superconducting niobium thin film cavities

New directions in superconducting radio frequency cavities for accelerators

Estimation of surface resistance for epitaxial NbN films in the frequency range of 0.1-1.1 THz

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Study of the surface resistance of niobium sputter-coated copper cavities

Niobium Coating of Cavities Using Cathodic Arc