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2019-08-21
06:46
Thermal shock experiment of beryllium exposed to intense high energy proton beam pulses / Ammigan, K (Fermilab) ; Bidhar, S (Fermilab) ; Hurh, P (Fermilab) ; Zwaska, R (Fermilab) ; Butcher, M (CERN) ; Calviani, M (CERN) ; Guinchard, M (CERN) ; Losito, R (CERN) ; Kuksenko, V (Oxford U.) ; Roberts, S (Oxford U.) et al.
Beryllium is a material extensively used in various particle accelerator beam lines and target facilities, as beam windows and, to a lesser extent, as secondary particle production targets. With increasing beam intensities of future multimegawatt accelerator facilities, these components will have to withstand even greater thermal and mechanical loads during operation. [...]
FERMILAB-PUB-18-670-AD.- 2019 - 14 p. - Published in : Phys. Rev. Accel. Beams 22 (2019) 044501 Fulltext: PDF; Fulltext from Publisher: PDF; External link: FERMILABPUB

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2019-08-21
06:46
Field Quality of HD3—A Nb$_3$Sn Dipole Magnet Based on Block Design / Wang, Xiaorong (LBL, Berkeley) ; Cheng, Daniel W (LBL, Berkeley) ; Dietderich, Daniel R (LBL, Berkeley) ; DiMarco, Joseph (Fermilab) ; Felice, Hélène (Saclay) ; Ferracin, Paolo (CERN) ; Marchevsky, Maxim (LBL, Berkeley) ; Prestemon, Soren O (LBL, Berkeley) ; Sabbi, Gianluca (LBL, Berkeley)
HD3 is the latest magnet of a series of block-type Nb3Sn dipole model magnets developed by the Superconducting Magnet Program at Lawrence Berkeley National Laboratory. The magnet is 1 m long with a clear aperture of 43 mm. [...]
FERMILAB-PUB-19-402-TD.- 2019 - 7 p. - Published in : IEEE Trans. Appl. Supercond. 29 (2019) 4002507

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2019-08-21
06:46
Optimization of the CLIC positron source using a start-to-end simulation approach involving multiple simulation codes / Han, Y L (Orsay, LAL) ; Bayar, C (Ankara U.) ; Latina, A (CERN) ; Doebert, S (CERN) ; Schulte, D (CERN) ; Ma, L L (Shandong U.)
A start-to-end optimization simulation toolkit for the CLIC positron source has been developed using multiple simulation codes to model adequately different areas of the positron source. The positron source includes the targets using channeling and pair-production processes, the adiabatic matching device and the pre-injector and injector linacs. [...]
2019 - 6 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 928 (2019) 83-88

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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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