CERN Accelerating science

CERN Document Server 5 ჩანაწერია ნაპოვნი  ძიებას დასჭირდა 0.64 წამი. 
1.
Thick Film Morphology and SC Characterizations of 6 GHz Nb/Cu Cavities / Garcia Diaz, Vanessa (INFN, Legnaro ; U. Ferrara (main)) ; Azzolini, Oscar (INFN, Legnaro) ; Chyhyrynets, Eduard (INFN, Legnaro) ; Fonnesu, Dorothea (CERN) ; Keppel, Giorgio (INFN, Legnaro) ; Kugeler, Oliver (Helmholtz-Zentrum, Berlin) ; Pira, Cristian (INFN, Legnaro) ; Stivanello, Fabrizio (INFN, Legnaro) ; Tikhonov, Dmitry (Helmholtz-Zentrum, Berlin) ; Valizadeh, Reza (Daresbury) et al.
Thick films deposited in long pulse DCMS mode onto 6 GHz copper cavities have demonstrated the mitigation of the Q-slope at low accelerating fields. The Nb thick films (~40 microns) show the possibility to reproduce the bulk niobium superconducting properties and morpholo-gy characterizations exhibited dense and void-free films that are encouraging for the scaling of the process to 1.3 GHz cavities. [...]
2022 - 5 p. - Published in : JACoW SRF 2021 (2022) 18-22 Fulltext: PDF;
In : 20th International Conference on RF Superconductivity (SRF 2021), Online, US, 28 Jun - 2 Jul 2021, pp.18-22
2.
CERN Based Tc Measurement Station for Thin-Film Coated Copper Samples and Results on Related Studies / Fonnesu, Dorothea (CERN ; Siegen U.) ; Bremer, Johan (CERN) ; Koettig, Torsten (CERN) ; Laín-Amador, Lucia (CERN) ; Pereira Carlos, Carlota (CERN) ; Rosaz, Guillaume (CERN) ; Vaaranta, Antti (Helsinki U.)
In the framework of the Future Circular Collider (FCC) Study, the development of thin-film coated superconducting radio-frequency (SRF) cavities capable of providing higher accelerating fields (10 to 20 MV/m against 5 MV/m of LHC) represents a major challenge. The development of a test stand commissioned at CERN for the inductive measurement of the critical temperature (Tcc) of SC thin-film deposited on copper samples for SRF application is presented in this work. [...]
2022 - 4 p. - Published in : JACoW SRF 2021 (2022) 105-108 Fulltext: PDF;
In : 20th International Conference on RF Superconductivity (SRF 2021), Online, US, 28 Jun - 2 Jul 2021, pp.105-108
3.
Reverse coating technique for the production of Nb thin films on copper for superconducting radio-frequency applications / Fonnesu, D (CERN) ; Baris, A (CERN) ; Calatroni, S (CERN) ; Lain Amador, L (CERN) ; Pfeiffer, S (CERN) ; Rosaz, G (CERN) ; Bonura, M (U. Geneva (main)) ; Senatore, C (U. Geneva (main))
In the framework of the Future Circular Collider Study, the development of thin-film coated superconducting radio-frequency copper cavities capable of providing higher accelerating fields (10–20 MV m1 against 5 MV m1 for the Large Hadron Collider) represents a major challenge. The method investigated here for the production of seamless niobium-coated copper cavities is based on the electroforming of the copper structure around a sacrificial aluminium mandrel that is pre-coated with a niobium thin film. [...]
2022 - 11 p. - Published in : Supercond. Sci. Technol. 35 (2022) 125003 Fulltext: PDF;
4.
Improved film density for coatings at grazing angle of incidence in high power impulse magnetron sputtering with positive pulse / Avino, F (CERN) ; Fonnesu, D (CERN) ; Koettig, T (CERN) ; Bonura, M (Geneva U.) ; Senatore, C (Geneva U.) ; Perez Fontenla, A T (CERN) ; Sublet, A (CERN) ; Taborelli, M (CERN)
The production of a dense and void-free thin film on large and complex substrates is still a challenge in Physical Vapor Deposition. High Power Impulse Magnetron Sputtering (HiPIMS) with voltage inversion (positive pulse) after the main negative pulse is an attractive alternative to a negatively biased substrate to improve the film properties. [...]
2020 - 9 p. - Published in : Thin Solid Films 706 (2020) 138058 Fulltext from Publisher: PDF;
5.
The electron capture in 163Ho experiment – ECHo / Gastaldo, L (Kirchhoff Inst. Phys.) ; Blaum, K (Heidelberg, Max Planck Inst.) ; Chrysalidis, K (Mainz U., Inst. Phys.) ; Day Goodacre, T (CERN) ; Domula, A (Dresden, Tech. U.) ; Door, M (Heidelberg, Max Planck Inst.) ; Dorrer, H (Mainz U., Inst. Kernphys. ; PSI, Villigen ; Bern U.) ; Düllmann, Ch E (Mainz U., Inst. Kernphys. ; Darmstadt, GSI ; Helmholtz Inst., Mainz) ; Eberhardt, K (Mainz U., Inst. Kernphys. ; Helmholtz Inst., Mainz) ; Eliseev, S (Heidelberg, Max Planck Inst.) et al.
Neutrinos, and in particular their tiny but non-vanishing masses, can be considered one of the doors towards physics beyond the Standard Model. Precision measurements of the kinematics of weak interactions, in particular of the3H β-decay and the163Ho electron capture (EC), represent the only model independent approach to determine the absolute scale of neutrino masses. [...]
2017 - 72 p. - Published in : Eur. Phys. J. Spec. Top. 226 (2017) 1623-1694

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