CERN Accelerating science

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1.
Design, fabrication and RF measurements of the storage and correction cavity prototypes of the RF pulse compression system for the klystron-based CLIC main linac / Wang, Ping ; Grudiev, Alexej (CERN) ; Riffaud, Benoit (CERN) ; Berthome, Emmanuel ; Motschmann, Fritz ; Syratchev, Igor (CERN) ; Scibor, Karol (CERN) ; Giordanino, Laurene ; Catalan Lasheras, Nuria (CERN) ; Morales Sanchez, Pedro (CERN)
An RF pulse compression system based on double-height waveguides was studied for the Klystron-based CLIC main linac. [...]
CERN-ACC-2024-0003 ; CLIC-Note-1198.
- 2024 - 17.
Full text
2.
Design optimization of the water-cooled coil for the LEIR extraction septum / Lackner, Friedrich (CERN) ; Balhan, Bruno (CERN) ; Motschmann, Fritz (CERN) ; Borburgh, Jan (CERN) ; Atanasov, Miroslav (CERN) ; Masson, Thierry (CERN) ; Erends, Vera (Utrecht U.)
A pulsed septum magnet (SMH40) is used for heavy ion extraction from the Low Energy Ion Ring (LEIR). A non-conformity on the coil cooling circuit made it necessary to consolidate the design of the septum blade and related manufacturing process. [...]
2023 - 4 p. - Published in : JACoW IPAC 2023 (2023) THPM019 Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.THPM019
3.
Beam-beam long range compensator mechanical demonstrator / Sito, Leonardo (CERN ; Naples U.) ; Rossi, Adriana (CERN) ; Bertarelli, Alessandro (CERN) ; Accettura, Carlotta (CERN) ; Carra, Federico (CERN) ; Motschmann, Fritz (CERN) ; Sterbini, Guido (CERN) ; Guardia Valenzuela, J (CERN) ; Gentini, Luca (CERN) ; Garlaschè, Marco (CERN) et al.
Beam-Beam Long-Range Compensators employing current-carrying wires are considered as valuable options in hadron colliders to increase dynamic aperture at small crossing angles. This paper presents a simple design proposal for application at CERN LHC. [...]
2023 - 3 p. - Published in : JACoW IPAC 2023 (2023) THPM015 Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.THPM015
4.
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
5.
Impedance and Thermal Studies of the LHC Injection Kicker Magnet Upgrade / Barnes, Michael J (CERN) ; Bjorkqvist, Oskar (CERN) ; Motschmann, Fritz (CERN)
The bunch intensities of High Luminosity (HL) LHC are predicted to lead to heating of the ferrite yokes of the LHC injection kicker magnets (MKI), in their current configuration, to their Curie temperature. Hence, the MKIs are being upgraded to meet the requirements of HL-LHC, which is planned to start in the mid-2020s. [...]
Geneva : JACoW, 2021 - 4 p. - Published in : JACoW IPAC 2021 (2021) 3502-3505 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.3502-3505
6.
Design Optimization and Assessment of Fabrication of ITER Central Solenoid Twin Box Joints / Santillana, Ignacio Aviles (CERN) ; Guinchard, Michael (CERN) ; Lourenço, Sandra Sophie (CERN) ; Motschmann, Fritz (CERN) ; Sacristan de Frutos, Oscar (CERN) ; Sgobba, Stefano (CERN) ; Bruton, Andrew (BIAM, St Paul lez Durance) ; Gaxiola, Enrique (BIAM, St Paul lez Durance) ; Libeyre, Paul (BIAM, St Paul lez Durance) ; Schild, Thierry (BIAM, St Paul lez Durance) et al.
The ITER Central Solenoid (CS) will be one of the world's largest and most powerful pulsed superconducting electromagnet ever built; at an approximate weight of 1300 tons and a total height of 18 m consisting of a stack of six electrically independent 4.1 m diameter modules. In order to electrically connect the CS with the feeder busbars, 12 twin box joints are used to assure an efficient high current transfer while avoiding excessive AC losses. [...]
2020 - 4 p. - Published in : IEEE Trans. Appl. Supercond. 30 (2020) 4202404
7.
Purification of Selective Laser Melting Additive Manufactured Niobium for Superconducting RF-Applications Transactions on Applied Superconductivity / Motschmann, Fritz (CERN) ; Gerard, Romain (CERN) ; Gilles, Favre (CERN)
Superconducting radio frequency (SRF)-cavities in the field of particle accelerators are mostly manufactured from bulk or sheet niobium (Nb). Complex shapes of SRF-components like high order mode-couplers or cavities working at high fields are high in cost and lead-time. [...]
2019 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 29 (2019) 3500805
8.
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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1 Motschmann, F
1 Motschmann, F.
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