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Magnetic flux trapping in superconducting niobium
/ Benvenuti, Cristoforo ; Calatroni, Sergio ; Campisi, I E ; Darriulat, Pierre ; Durand, C ; Peck, M A ; Russo, R ; Valente, A M
In a systematic study of the RF response of superconducting niobium cavities operated in their fundamental TM010 mode at 1.5 GHz, magnetic flux trapping has been used as a tool to diagnose the presenc e of pinning centres. In addition to bulk niobium cavities the study covers copper cavities, the inner walls of which are coated with 1.5 µm thick niobium films grown by magnetron sputtering in a nobl e gas atmosphere. [...]
CERN-EST-97-008-SM.-
Geneva : CERN, 1997 - 7 p.
Access to fulltext document: PDF; Source files restricted to CERN users: ZIP;
In : 8th Workshop on RF Superconductivity, v.1-v.4, Abano-Terme, Italy, 6 - 10 Oct 1997, pp.331-336
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2.
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Structural and RF properties of niobium films deposited onto annealed niobium resonators
/ Benvenuti, Cristoforo ; Calatroni, Sergio ; Campisi, I E ; Darriulat, Pierre ; Durand, C ; Kneisel, P ; Marsh, S ; Peck, M A ; Russo, R ; Sgobba, Stefano
Studies have been performed on the properties of niobium thin films sputtered onto solid niobium TM010 resonators at 1.5 GHz. The purpose of the work is to study the behaviour of the film's RF and str uctural properties as a function of heat treatment temperature in order to determine if and at what treatment temperature the properties of the films merge with those of the bulk. [...]
CERN-EST-97-007-SM.-
Geneva : CERN, 1997 - 9 p.
Access to fulltext document: PDF;
In : 8th Workshop on RF Superconductivity, v.1-v.4, Abano-Terme, Italy, 6 - 10 Oct 1997, pp.1065-1073
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3.
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Study of the role of the interface between niobium films and copper RF resonators
/ Benvenuti, Cristoforo ; Calatroni, Sergio ; Campisi, I E ; Darriulat, Pierre ; Peck, M A ; Russo, R
Niobium-coated copper resonators are usually produced with an oxide interface between the film and the substrate. This oxide has two sources: the passivation layer inevitably formed on the surface of the cavity after chemical preparation before coating, and the niobium oxide which builds up on the surface of the cathode when it is exposed to air, and is transferred to the cavity surface during coa ting. [...]
CERN-EST-97-005-SM.-
Geneva : CERN, 1997 - 7 p.
Access to fulltext document: PDF;
In : 8th Workshop on RF Superconductivity, v.1-v.4, Abano-Terme, Italy, 6 - 10 Oct 1997, pp.1050-1056
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4.
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Properties of Copper Cavities Coated with Niobium Using Different Discharge Gases
/ Benvenuti, Cristoforo ; Calatroni, Sergio ; Campisi, I E ; Darriulat, Pierre ; Marino, M ; Peck, M A ; Russo, R ; Valente, A M
Experimental evidence is presented showing that in conformity with theoretical expectations, discharge gas atoms are trapped in sputtered films whenever a gas of atomic mass smaller than that of the c athode is used. In such a case, discharge gas atoms may be reflected by the cathode as high energy neutrals and get incorporated in the growing film. [...]
CERN-EST-97-004-SM.-
Geneva : CERN, 1997 - 8 p.
Access to fulltext document: PDF;
In : 8th Workshop on RF Superconductivity, v.1-v.4, Abano-Terme, Italy, 6 - 10 Oct 1997, pp.1057-1064
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7.
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Study of the discharge gas trapping during thin film growth
/ Calatroni, Sergio ; Amorosi, S ; Anderle, M ; Benvenuti, Cristoforo ; Carver, J ; Chiggiato, P ; Neupert, H ; Vollenberg, W
Discharge gas trapping in thin films produced by sputtering is known to be due to high energy neutrals bouncing back from the cathode. Qualitatively, the phenomenon is enhanced by raising the discharge voltage and is strongly dependent on the atomic masses of the discharge gas and of the cathode material. [...]
CERN-EST-99-005-SM.-
Geneva : CERN, 2001 - 11 p.
- Published in : Vacuum 60 (2001) 89-94
Access to fulltext document: PDF;
In : 6th European Vacuum Conference, Villeurbanne, France, 7 - 10 Dec 1999, pp.89-94
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10.
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Study of the surface resistance of niobium sputter-coated copper cavities
/ Benvenuti, Cristoforo ; Calatroni, Sergio ; Campisi, I E ; Darriulat, Pierre ; Peck, M A ; Russo, R ; Valente, A M
A systematic study of the superconducting properties of niobium films deposited on the inner wall of copper radiofrequency cavities is presented. Films are grown by sputtering with different discharge gases (Xe, Kr, Ar and Ar/Ne mixtures) on substrates prepared under different conditions. [...]
1999
- Published in : IEEE Trans. Appl. Supercond. 9 (1999) 900-903
IEEE Published version, local copy: PDF;
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11.
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Study of the surface resistance of superconducting niobium films at 1.5 GHz
/ Benvenuti, Cristoforo ; Calatroni, Sergio ; Campisi, I E ; Darriulat, Pierre ; Peck, M A ; Russo, R ; Valente, A M
A systematic study of superconducting properties of niobium films sputtered on the inner wall of radiofrequency cavities is presented. The measured quantities include in particular the response to 1.5 GHz microwaves, the critical temperature, the penetration depth and the magnetic penetration field. [...]
CERN-EST-98-002-SM.-
Geneva : CERN, 1999
- Published in : Physica C 316 (1999) 153-88
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12.
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Technical Developments on Reduced $\beta$ Superconducting Cavities at CERN
/ Aberle, O ; Boussard, Daniel ; Calatroni, Sergio ; Chiaveri, Enrico ; Häbel, E ; Hanni, R ; Losito, R ; Marque, S ; Tückmantel, Joachim
Several authors proposed the construction of superconducting proton linacs using the LEP2 cavities once LEP will be decommissioned. However only a fraction (about half) of these cavities can be used as they are for the high-energy part (b~1) of such a linac, the low energy part requiring the development of accelerating structures optimized for lower values of the particle velocity. [...]
CERN-SL-99-024-CT.-
Geneva : CERN, 1999 - 4 p.
Report
Fulltext: PDF; Fulltext PDF: PDF; IEEE Published version, local copy: PDF;
In : 18th Biennial Particle Accelerator Conference, New York, NY, USA, 29 Mar - 2 Apr 1999, pp.e-proc. 949
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15.
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Niobium sputter-coated copper resonators
/ Benvenuti, Cristoforo ; Calatroni, Sergio ; Campisi, I E ; Darriulat, Pierre ; Durand, C ; Peck, M A ; Russo, R ; Valente, A M
Niobium sputter-coated copper resonators are successfully employed in operating particle accelerators, the most outstanding example being LEP2 at CERN. In this review we present recent progress in the understanding of the basic principles governing their behaviour, based on an extensive R&D; programme carried out at CERN on 1.5 GHz resonators operated in the TM010 mode. [...]
CERN-EST-97-002-SM.-
Geneva : CERN, 1998 - 9 p.
- Published in : Part. Accel.: 61 (1998) , pp. 107-118
Access to fulltext document: PDF;
In : 8th Workshop on RF Superconductivity, v.1-v.4, Abano-Terme, Italy, 6 - 10 Oct 1997, pp.1028-1037
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17.
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A short summary of the R&D activity carried out at CERN in the past five years and ideas for further R&D based on the present state of the art
/ Calatroni, Sergio ; Benvenuti, Cristoforo ; Neupert, H ; Prada, M ; Valente, A M
Geneva : CERN, 2000
In : Workshop on Thin Film Coating Methods For Superconducting Accelerating Cavities, Hamburg, Germany, 10 Jul 2000, pp.101-139
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18.
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Flavour Changing Neutral Higgs Boson Decays from Squark - Gluino Loops
/ Curiel, A M ; Herrero, M J ; Temes, D
We study the flavour changing neutral Higgs boson decays that can be induced from genuine supersymmetric particles at the one-loop level and within the context of the Minimal Supersymmetric Standard Model. We consider all the possible flavour changing decay channels of the three neutral Higgs bosons into second and third generation quarks, and focus on the Supersymmetric-QCD corrections from squark-gluino loops which are expected to provide the dominant contributions. [...]
hep-ph/0210335; FTUAM-2002-21; IFT-CSIC-UAM-2002-37.-
Madrid : Madrid Univ. Dept. Fís. Teór., 2003 - 32 p.
- Published in : Phys. Rev. D 67 (2003) 075008
Access to fulltext document: PDF; External link: hep-ph/0210335 PDF
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19.
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Superconducting niobium cavities, a case for the film technology
/ Arbet-Engels, V P ; Benvenuti, Cristoforo ; Calatroni, Sergio ; Darriulat, Pierre ; Peck, M A ; Valente, A M ; Van't Hof, C A
Evidence is presented for niobium film cavities performing as well as niobium bulk cavities, at variance with a widespread belief that their much smaller grain size should be a fundamental limitation preventing high quality factors to be maintained over a wide range of accelerating fields. By comparing the relative merits of the bulk and film technologies, a strong case is presented in favour of the latter. [...]
Geneva : CERN, 2001
- Published in : Nucl. Instrum. Methods Phys. Res., A 463 (2001) 1-8
Fulltext: PDF;
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25.
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Influence of copper substrate treatments on properties of niobium coatings
/ Calatroni, Sergio ; Bacher, J P ; Benvenuti, Cristoforo ; Cosso, R ; Dalin, J M ; Guérin, J ; Lacarrère, D ; Lasserre, A ; Orlandi, G ; Radicioni, E et al.
CERN-MT-93-11-SM.
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1993. - 12 p.
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