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Characterization of the Formability of High-Purity Polycrystalline Niobium Sheets for Superconducting Radiofrequency Applications
/ Croteau, Jean-François (Unlisted, FR) ; Robin, Guillaume (U. Lorraine) ; Cantergiani, Elisa (Unlisted, FR) ; Atieh, Said (CERN) ; Jacques, Nicolas (Unlisted, FR) ; Mazars, Gilles (Unlisted, FR) ; Martiny, Marion (U. Lorraine)
The forming limit diagram (FLD) of high-purity niobium sheets used for the manufacturing of superconducting radiofrequency (SRF) cavities is presented. The Marciniak (in-plane) test was used with niobium blanks with a thickness of 1 mm and blank carriers of annealed oxygen-free electronic (OFE) copper. [...]
2021 - 7 p.
- Published in : J. Eng. Mater. Technol. 144 (2021) 021004
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2.
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Seamless 1.3 GHz Copper Cavities for Nb Coatings: Cold Test Results of Two Different Approaches
/ Vega Cid, Lorena (CERN) ; Atieh, Said (CERN) ; Ferreira, Leonel (CERN) ; Laín-Amador, Lucia (CERN) ; Leith, Stewart (CERN) ; Pereira Carlos, Carlota (CERN) ; Rosaz, Guillaume (CERN) ; Scibor, Karol (CERN) ; Venturini Delsolaro, Walter (CERN) ; Vidal García, Pablo (CERN ; Madrid, CIEMAT)
A necessary condition for high SRF performances in thin film coated cavities is the absence of substrate defects. For instance, in the past, defects originated around electron beam welds in high magnetic field areas have been shown to be the cause of performance limitations in Nb/Cu cavities. [...]
2022 - 5 p.
- Published in : JACoW SRF 2021 (2022) 498-502
Fulltext: PDF;
In : 20th International Conference on RF Superconductivity (SRF 2021), Online, US, 28 Jun - 2 Jul 2021, pp.498-502
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3.
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HOM Couplers and RF Antennas for HL-LHC Crab Cavities: Developments for Manufacturing
/ Barrière, Simon (CERN) ; Atieh, Said (CERN) ; Bulat, Bartosz (CERN) ; Calaga, Rama (CERN) ; Calvo, Sebastien (CERN) ; Capatina, Ofelia (CERN) ; Demazière, Thomas (CERN) ; Favre, Gilles (CERN) ; Gallifa Terricabras, Adrià (CERN) ; Garlasché, Marco (CERN) et al.
Superconducting RF crab cavities are being manufactured as part of the High-Luminosity LHC project at CERN. Amongst its related ancillaries, radiofrequency HOM (High Order Modes) couplers and field antennas are essential for reaching nominal performance during operation with high energy beams, as they monitor and control the electromagnetic fields in the cavities. [...]
2022 - 5 p.
- Published in : JACoW SRF 2021 (2022) 303-307
Fulltext: PDF;
In : 20th International Conference on RF Superconductivity (SRF 2021), Online, US, 28 Jun - 2 Jul 2021, pp.303-307
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4.
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5.
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6.
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State of the Art of Niobium Machining for SRF Applications
/ Naisson, Pierre (CERN) ; Atieh, Said (CERN) ; Dumont, Floriant (Lab. Hubert Curien, St. Etienne) ; Fabre, Dorian (Lab. Hubert Curien, St. Etienne) ; Scibor, Karol (CERN) ; Trubacova, Pavlina (CERN) ; Valiorgue, Frederic (Lab. Hubert Curien, St. Etienne)
Niobium is a demanding material to be machined. Its low hardness, high melting temperature and abrasivity leads to poor cutting condition, and surface quality and shape accuracy could be difficult to achieve, especially for complex shapes such as HOM antennas. [...]
2019 - 4 p.
- Published in : 10.18429/JACoW-SRF2019-MOP061
Fulltext: PDF;
In : 19th International Conference on RF Superconductivity, Dresden, Germany, 30 Jun - 05 Jul 2019, pp.210-213
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7.
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8.
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Novel Manufacturing Concepts for 12 GHz High Gradient Accelerating Structures
/ Solodko, Anastasiya (CERN) ; Atieh, Said (CERN) ; Catalán Lasheras, Nuria (CERN) ; Grudiev, Alexej (CERN) ; Lebet, Serge (CERN) ; Wuensch, Walter (CERN) ; Zha, Hao (Beijing U. of Tech.)
CLIC high gradient accelerating structures (AS) work-ing in X-band are made of copper ultra-high precision discs, requiring both milling and turning operations. Discs are then joint together by diffusion bonding. [...]
CERN-ACC-2017-265; CLIC-Note-1131.-
2017 - 4 p.
- Published in : 10.18429/JACoW-IPAC2017-THPAB039
Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.THPAB039
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Crab cavity and cryomodule development for HL-LHC
/ Carra, Federico (CERN) ; Amorim Carvalho, Alexandre (CERN) ; Artoos, Kurt (CERN) ; Atieh, Said (CERN) ; Aviles Santillana, Ignacio (CERN) ; Belomestnykh, Sergey (RIKEN BNL) ; Boucherie, Antoine (CERN) ; Brachet, Jean-Pierre (CERN) ; Brodzinski, Krzysztof (CERN) ; Burt, Graeme (Lancaster U.) et al.
The HL-LHC project aims at increasing the LHC luminosity by a factor 10 beyond the design value. The installation of a set of RF Crab Cavities to increase bunch crossing angle is one of the key upgrades of the program. [...]
2015 - 7 p.
- Published in : 10.18429/JACoW-SRF2015-FRBA02
Fulltext: PDF;
In : 17th International Conference on RF Superconductivity, Whistler, Canada, 13 - 18 Sep 2015, pp.FRBA02
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10.
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Design of Dressed Crab Cavities for the HL-LHC Upgrade
/ Zanoni, Carlo (CERN) ; Artoos, Kurt (CERN) ; Atieh, Said (CERN) ; Aviles Santillana, Ignacio (CERN) ; Belomestnykh, Sergey (RIKEN BNL) ; Ben-Zvi, Ilan (RIKEN BNL ; SUNY, Stony Brook) ; Brachet, Jean-Pierre (CERN) ; Burt, Graeme (Lancaster U.) ; Calaga, Rama (CERN) ; Capatina, Ofelia (CERN) et al.
The HL-LHC upgrade relies on a set of RF crab cavities for reaching its goals. Two parallel concepts, the Double Quarter Wave (DQW) and the RF Dipole (RFD), are going through a comprehensive design process along with preparation of fabrication in view of extensive tests with beam in SPS. [...]
2015 - 5 p.
- Published in : 10.18429/JACoW-SRF2015-THPB070
Fulltext: PDF;
In : 17th International Conference on RF Superconductivity, Whistler, Canada, 13 - 18 Sep 2015, pp.THPB070
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