Abstract
Extensive tests have been performed on several cavities, operated at 1.5 GHz in the TMoio mode, obtained by sputter-coating niobium on copper, in order to study the physical phenomena responsible for their ultimate performance. Cavities manufactured with the same technique, but resonating at 352 MHz, are in current operation in the CERN Large Electron-Positron Collider LEP.
The measured RF data have been analyzed to extract information about: 1) the BCS resistance properties of each film, 2) the residual resistance of sputtered niobium deposited onto copper cavities manufactured with various techniques, and 3) the influence of trapped magnetic fluxons on the film’s superconducting RF properties.
Several tests have been made also on bulk niobium cavities at 1.5 GHz manufactured through different methods in order to compare and extend the results of the film studies.
Analyses confirm that the sputtered niobium films provide: 1) lower BCS resistance than the bulk, 2) lower sensitivity of the surface resistance to external applied magnetic field, 3) residual resistance comparable to the bulk, once the substrate’s properties are well controlled.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
C. Benvenuti, S. Calatroni, E. Chiaveri, G. Orlandi, and W. Weingarten, Superconducting cavities for particle accelerators, Cryogenics, 34:57 (1994)
H. Padamsee, K. W. Shepard and R. Sundelin, Physics and accelerator applications of RF superconductivity, Ann. Rev. Nucl. Part. Sci. 43 (1993) 635
W. Weingarten, Progress in thin film techniques, Part. Accel. 53:199 (1996)
C. Benvenuti, P. Bernard, D. Bloess, G. Cavallari, E. Chiaveri, E. Haebel, N. Hilleret, J. Tückmantel, and W. Weingarten, Superconducting niobium sputter-coated copper cavity modules for the LEP energy upgrade, 1991 IEEE particle accelerator conference San Francisco, CA, USA ; 6 – 9 May 1991 (1023–1025).
R. Brinkmann, Status of the design for the TESLA linear collider, 16th Particle Accelerator Conference -PAC 95 Dallas, TX, USA ; 1 – 5 May 1995 (674–676).
C. Benvenuti, V. Palmieri, and R. Vaglio, Construction materials for superconducting RF accelerating cavities, 4th Topical Symposium on Superconductivity and Superconducting Materials Technologies, Florence, Italy; 28 June — 4 July 1994 . P Vincenzini, ed., Faenza (1994), p.637.
C. Hauviller, Fully hydroformed RF cavities, 1989 IEEE particle accelerator conference Chicago, IL, USA; 20 – 23 Mar 1989, p. 485.
V. Palmieri, R. Preciso, V. L. Ruzinov, S. Yu. Stark, I. I. Kulik, J. P. Bacher, J. P. Brächet, H. Fritz, F. Kuttl, and G. Lion, Recent experience with spinning of 1.5 GHz seamless copper monocells, Proceedings of the 7th Workshop on RF Superconductivity, Saclay, 1995, p. 571.
G. Orlandi, C. Benvenuti, S. Calatroni, M. Hauer, M and F. Scalambrin, Niobium coatings for 1.5 GHz RF cavities, Part. Accel. 46: 1 (1994).
D. C. Mattis and J. Bardeen, Phys. Rev. 111:412 (1958).
A. A. Abrikosov, L. P. GorTcov and I. M. Khalatnikov, Zh. Eks. Teor. Fiz. 35 (1958) 265 and JETP 35:182(1959).
J. P. Turneaure, J. Halbritter and H A. Schwettman, The surface impedance of superconductors and normal conductors: the Mattis-Bardeen theory, J. Supercond. 4:341 (1991).
J. P. Carbotte, Properties of boson-exchange superconductors, Rev. Mod. Phys, 62:1027 (1990) and references therein.
J. Halbritter, On surface resistance of superconductors, Z. Phys. 266:209 (1974).
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1998 Springer Science+Business Media New York
About this chapter
Cite this chapter
Benvenuti, C. et al. (1998). Studies of RF-Superconductivity Properties of Niobium Film-Coated Cavities at CERN. In: Kittel, P. (eds) Advances in Cryogenic Engineering. Advances in Cryogenic Engineering, vol 43. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-9047-4_8
Download citation
DOI: https://doi.org/10.1007/978-1-4757-9047-4_8
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4757-9049-8
Online ISBN: 978-1-4757-9047-4
eBook Packages: Springer Book Archive