CERN Accelerating science

CERN Published Articles

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2019-08-20
06:49
Thermally Activated ReBCO Switches for Charging High-Current Magnets / Bykovskiy, Nikolay (CERN) ; Dudarev, Alexey (CERN) ; Kate, Herman ten (CERN)
Aiming at design improvements for the International Axion Observatory, alternative options for powering of the 20-kA magnet are under consideration. Use of high-temperature super- conductors in a transformer–rectifier system cooled by a single stage cryocooler at 40 K–50 K level is a promising option, which al- lows to avoid massive movable bus bars, current leads, and related services. [...]
2019 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 29 (2019) 5502005 Fulltext from publisher: PDF;

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2019-08-20
06:49
Manufacture and Test of the ITER TF Type HTS Current Lead Prototypes / Ding, Kaizhong (Hefei, Inst. Plasma Phys.) ; Zhou, Tingzhi (Hefei, Inst. Plasma Phys.) ; Ballarino, Amalia (CERN) ; Gung, Chenyu (Southampton U.) ; Lu, Kun (Hefei, Inst. Plasma Phys.) ; Song, Yuntao (Hefei, Inst. Plasma Phys.) ; Niu, Erwu (Beihang U.) ; Bauer, Pierre (BIAM, St Paul lez Durance) ; Devred, Arnaud (BIAM, St Paul lez Durance) ; Lee, Seungje (BIAM, St Paul lez Durance) et al.
High temperature superconducting current leads (HTS-CL) are designed to supply the current to the large superconducting ITER magnets for the operation with reduced heat load to the cryogenic system. The Toroidal field (TF) current leads are the largest with a current capacity of 68 kA each. [...]
2019 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 29 (2019) 4802605

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2019-08-20
06:49
How to Computationally Determine the Maximum Stable Operation Current of an HTS Magnet / Ruuskanen, Janne (Tampere U. of Tech.) ; Stenvall, Antti (Tampere U. of Tech.) ; Lahtinen, Valtteri (Tampere U. of Tech.) ; van Nugteren, Jeroen (CERN) ; Kirby, Glyn (CERN) ; Murtomäki, Jaakko (Tampere U. of Tech.)
The short-sample critical current is only an indicative property for the maximum current a magnet can be continuously operated with. This was especially visible in the experiments of one of the world's first Roebel-cable-based high temperature superconductors dipole magnet prototype built and tested at CERN in 2017 where the thermal runaway developed very slowly in many cases. [...]
2019 - 4 p. - Published in : IEEE Trans. Appl. Supercond. 29 (2019) 4701204 fulltext from publisher: PDF;

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2019-08-20
06:49
The Effect of Specific Manufacturing Characteristics on PF ITER Full-Size Joint Performance / Pison, Pilar Fernandez (Carlos III U., Madrid) ; Langeslag, Stefanie A E (CERN) ; Santillana, Ignacio Aviles (CERN) ; Dimitrijevic, Alexander (CERN) ; Sgobba, Stefano (CERN) ; Ilyin, Yury (BIAM, St Paul lez Durance) ; Simon, Fabrice (BIAM, St Paul lez Durance) ; Lim, Byung Su (BIAM, St Paul lez Durance)
The development of new generation superconducting magnets for fusion research, such as the ITER experiment, is largely based on coils wound from so-called “Cable-In-Conduit” Conductors (CICCs). CICCs consist of various types of stainless steel jackets, densely filled with compacted superconducting strands, which are cooled by supercritical helium. [...]
2019 - 6 p. - Published in : IEEE Trans. Appl. Supercond. 29 (2019) 4200706 fulltext from publisher: PDF;

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2019-08-20
06:49
3-D Mechanical Modeling of 20 T HTS Clover Leaf End Coils—Good Practices and Lessons Learned / Murtomäki, Jaakko Samuel (CERN ; Tampere U. of Tech.) ; van Nugteren, Jeroen (CERN) ; Stenvall, Antti (Tampere U. of Tech.) ; Kirby, Glyn (CERN) ; Rossi, Lucio (CERN)
Very high electromagnetic forces are generated in the superconducting coils of high field accelerator magnets. The cables, which are used to wind the coils, can withstand limited pressure levels and strains generated during the powering without degradation. [...]
2019 - 8 p. - Published in : IEEE Trans. Appl. Supercond. 29 (2019) 4004608 fulltext from publisher: PDF;

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2019-08-20
06:49
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

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2019-08-20
06:49
Induced radioactivity in ATLAS cavern measured by MPX detector network / Campbell, M (CERN) ; Heijne, E (IEAP CTU, Prague ; CERN) ; Leroy, C (Montreal U.) ; Nessi, M (CERN) ; Pospisil, S (IEAP CTU, Prague) ; Solc, J (IEAP CTU, Prague ; Czech Metrology Inst., Brno) ; Suk, M (IEAP CTU, Prague) ; Turecek, D (IEAP CTU, Prague ; CESNET, Praha) ; Vykydal, Z (IEAP CTU, Prague ; Czech Metrology Inst., Brno)
An application of the use of MPX detectors for the measurement of induced radioactivity in the Large Hadron Collider (LHC) experiment environment is presented. The sixteen ATLAS-MPX detectors measured the associated photon ambient dose equivalent rate (H$^*$(10) rate) in ATLAS due to the LHC operation. [...]
2019 - 13 p. - Published in : JINST 14 (2019) P03010 Fulltext from Publisher: PDF;

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2019-08-20
06:49
Use of a hybrid semiconductor pixel detector as a precision beam monitor at CERN accelerator facilities / Natochii, A (Orsay, LAL ; Taras Shevchenko U. ; CERN) ; Murtas, F (CERN ; Frascati) ; Scandale, W (CERN) ; Alozy, J (CERN)
We describe the performance of the Timepix silicon detector operation at the SPS and H8 extracted beam line at CERN. Some detector calibration results and tuning will be discussed and a new cluster analysis algorithm, to reconstruct the particle hits, is described as well. [...]
2019 - 21 p. - Published in : JINST 14 (2019) P03018 Fulltext from Publisher: PDF;

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2019-08-20
06:49
Effect of repetitive reset, temperature variation and frequency offset on the performance of PLL for the LHC experiments / Mitra, J (HBNI, Mumbai) ; Mendes, E (CERN) ; Baron, S (CERN)
The Large Hadron Collider (LHC) uses timing, trigger and control (TTC) system backbone to distribute the bunch clock and other critical timing signals to all the participating experiments. The clock signal is directly derived from the radio frequency (RF) driving the beams in the accelerator. [...]
2019 - 19 p. - Published in : JINST 14 (2019) P02001 Fulltext: PDF; Fulltext from Publisher: PDF;

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2019-08-20
06:49
Penetration of ionizing radiation from ATLAS cavern into USA15 measured by MPX detectors / Campbell, M (CERN) ; Heijne, E (IEAP CTU, Prague ; CERN) ; Leroy, C (Montreal U.) ; Nessi, M (CERN) ; Pospisil, S (IEAP CTU, Prague) ; Solc, J (IEAP CTU, Prague ; Czech Metrology Inst., Brno) ; Suk, M (IEAP CTU, Prague) ; Turecek, D (IEAP CTU, Prague ; CESNET, Praha) ; Vykydal, Z (IEAP CTU, Prague ; Czech Metrology Inst., Brno)
The attenuation of the ionizing radiation through a concrete wall between the ATLAS Cavern UX15 and Service Cavern USA15 was measured during LHC collisions in 2012 with two ATLAS-MPX detectors. The detectors were mounted on either side of the wall separating UX15 and USA15. [...]
2019 - 8 p. - Published in : JINST 14 (2019) P02020 Fulltext: PDF; Fulltext from Publisher: PDF;

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