SRF2011 - List of Authors (Calatroni, S.)

Paper

Title

Page

New Approaches to Nb Thin Film Coating

331

S. Calatroni, A.E. Gustafsson, M. Scheubel, W. Vollenberg
CERN, Geneva, Switzerland

Funding: The research leading to these results has received funding from the European Commission under the FP7 Research Infrastructures grant agreement no.227579.
Niobium films are widely used at CERN and several other Laboratories for the coating of superconducting cavities. The performances of these cavities are highly influenced by the thin film properties, and in particular its microstructure. Energetic condensation, and in particular High Power Impulse Magnetron Sputtering (HIPIMS) gives new opportunities for conventional magnetron sputtering equipment. In this talk we will review the background on thin film performance, the motivations of the study, illustrate the experience that has been gained at CERN during the first months of operation and present the results obtained so far.

THIOA06

Mechanical Design Considerations for β=1 Cavities

650

O. Capatina, G. Arnau-Izquierdo, S. Atieh, I. Aviles Santillana, S. Calatroni, A. D'Elia, R. Garoby, T. Junginger, D. Maciocha, E. Montesinos, V. Parma, T. Renaglia, T. Tardy, N. Valverde Alonso, W. Weingarten
CERN, Geneva, Switzerland
S. Chel, G. Devanz, J. Plouin
CEA/DSM/IRFU, France

The Superconducting Proton Linac (SPL) is an R&D effort coordinated by CERN in partnership with other international laboratories, aimed at developing key technologies for the construction of a multi-megawatt proton linac based on state-of-the-art RF superconducting technology, which would serve as a driver for new physics facilities such as neutrinos and Radioactive Ion Beam (RIB). Amongst the main objectives of this R&D effort, is the development of 704 MHz bulk niobium β=1 elliptical cavities, operating at 2 K with a maximum accelerating field of 25 MV/m, and the testing of a string of cavities integrated in a machine-type cryomodule. The R&D program concerning the elliptical β=1 cavities fabricated from niobium sheets explores new mechanical design and new fabrication methods. The paper presents several opportunities for design optimization that were identified. A comparison between stainless steel helium vessel and titanium helium vessel including Nb to Ti transitions is addressed. Different mechanical design aspects, including cryogenic considerations, and fabrication aspects were analyzed and the results are discussed.

Slides THIOA06 [5.292 MB]

THIOB07

HIE-ISOLDE quarter wave Nb/Cu cavity

686

M. Pasini, S. Calatroni, O. Capatina, A. D'Elia, M.A. Fraser, M. Therasse
CERN, Geneva, Switzerland
M. Pasini
Instituut voor Kern- en Stralingsfysica, K. U. Leuven, Leuven, Belgium

The HIE-ISOLDE project aims at the energy boost of the radio active beams produced in the ISOLDE facility from 3 MeV/u up to 5.5 MeV/u in a first stage and 10 MeV/u as ultimate installation. The beam acceleration is mainly achieved by employing 20 Nb sputtered Quarter Wave Resonator at β = 0.1 for which an R&D program has started. RF and mechanical design as well as the latest results of the sputtering process are reported in this paper.

Slides THIOB07 [4.042 MB]

Paper	Title	Page
TUIOB05	New Approaches to Nb Thin Film Coating	331
	S. Calatroni, A.E. Gustafsson, M. Scheubel, W. Vollenberg CERN, Geneva, Switzerland
	Funding: The research leading to these results has received funding from the European Commission under the FP7 Research Infrastructures grant agreement no.227579. Niobium films are widely used at CERN and several other Laboratories for the coating of superconducting cavities. The performances of these cavities are highly influenced by the thin film properties, and in particular its microstructure. Energetic condensation, and in particular High Power Impulse Magnetron Sputtering (HIPIMS) gives new opportunities for conventional magnetron sputtering equipment. In this talk we will review the background on thin film performance, the motivations of the study, illustrate the experience that has been gained at CERN during the first months of operation and present the results obtained so far.

THIOA06	Mechanical Design Considerations for β=1 Cavities	650
	O. Capatina, G. Arnau-Izquierdo, S. Atieh, I. Aviles Santillana, S. Calatroni, A. D'Elia, R. Garoby, T. Junginger, D. Maciocha, E. Montesinos, V. Parma, T. Renaglia, T. Tardy, N. Valverde Alonso, W. Weingarten CERN, Geneva, Switzerland S. Chel, G. Devanz, J. Plouin CEA/DSM/IRFU, France
	The Superconducting Proton Linac (SPL) is an R&D effort coordinated by CERN in partnership with other international laboratories, aimed at developing key technologies for the construction of a multi-megawatt proton linac based on state-of-the-art RF superconducting technology, which would serve as a driver for new physics facilities such as neutrinos and Radioactive Ion Beam (RIB). Amongst the main objectives of this R&D effort, is the development of 704 MHz bulk niobium β=1 elliptical cavities, operating at 2 K with a maximum accelerating field of 25 MV/m, and the testing of a string of cavities integrated in a machine-type cryomodule. The R&D program concerning the elliptical β=1 cavities fabricated from niobium sheets explores new mechanical design and new fabrication methods. The paper presents several opportunities for design optimization that were identified. A comparison between stainless steel helium vessel and titanium helium vessel including Nb to Ti transitions is addressed. Different mechanical design aspects, including cryogenic considerations, and fabrication aspects were analyzed and the results are discussed.
	Slides THIOA06 [5.292 MB]

THIOB07	HIE-ISOLDE quarter wave Nb/Cu cavity	686
	M. Pasini, S. Calatroni, O. Capatina, A. D'Elia, M.A. Fraser, M. Therasse CERN, Geneva, Switzerland M. Pasini Instituut voor Kern- en Stralingsfysica, K. U. Leuven, Leuven, Belgium
	The HIE-ISOLDE project aims at the energy boost of the radio active beams produced in the ISOLDE facility from 3 MeV/u up to 5.5 MeV/u in a first stage and 10 MeV/u as ultimate installation. The beam acceleration is mainly achieved by employing 20 Nb sputtered Quarter Wave Resonator at β = 0.1 for which an R&D program has started. RF and mechanical design as well as the latest results of the sputtering process are reported in this paper.
	Slides THIOB07 [4.042 MB]