CERN Accelerating science

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2019-06-19
06:00
Design and thermal calculations of FRESCA2 heat exchangers for pressurised superfluid helium baths temperature controlling / Polinski, J (Wroclaw Tech. U.) ; Grabowski, M (Wroclaw U.) ; Chorowski, M (Wroclaw U.) ; Crean, A V (CERN) ; Parma, V (CERN)
In order to characterise and qualify superconducting cables at currents up to 70 kA, at background magnetic fields up to 13 T and at 1.9 K or 4.3 K temperature levels the Facility for Reception of Superconducting Cable (FRESCA2) is currently under design in collaboration between CERN and WUST. The FRESCA2 design using the double cryostat concept, with superconducting magnet external cryostat and a cable sample insert internal cryostat. [...]
2019 - 6 p. - Published in : IOP Conf. Ser. Mater. Sci. Eng. 502 (2019) 012086 Fulltext: PDF;
In : 27th International Cryogenic Engineering Conference - International Cryogenic Materials Conference 2018, Oxford, United Kingdom, 3 - 7 Sep 2018, pp.012086

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2019-06-14
16:26
Consolidation des systèmes de déclenchement des thyratrons pour les aimants a impulsions rapides du complexe PS / Royer, Cyril
Ce document synthétise le travail réalisé au CERN dans le cadre de mon stage de fin d’études INSA [...]
CERN-THESIS-2019-060 - 63 p.

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2019-06-06
04:05
A primary electron beam facility at CERN / Åkesson, T. (Lund U.) ; Corsini, R. (CERN) ; Dutheil, Y. (CERN) ; Evans, L. (CERN) ; Goddard, B. (CERN) ; Grudiev, A. (CERN) ; Latina, A. (CERN) ; Papaphilippou, Y. (CERN) ; Stapnes, S. (CERN)
This paper describes the concept of a primary electron beam facility at CERN, to be used for dark gauge force and light dark matter searches. [...]
arXiv:1905.07657.
- 4 p.
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2019-05-30
04:08
Positron driven muon source for a muon collider / Alesini, D. (Frascati) ; Antonelli, M. (Frascati) ; Biagini, M.E. (Frascati) ; Boscolo, M. (Frascati) ; Blanco-García, O.R. (Frascati) ; Ciarma, A. (Frascati) ; Cimino, R. ; Iafrati, M. ; Giribono, A. (Frascati) ; Guiducci, S. (Frascati) et al.
The design of a future multi-TeV muon collider needs new ideas to overcome the technological challenges related to muon production, cooling, accumulation and acceleration. [...]
arXiv:1905.05747.
- 18 p.
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2019-05-29
15:16
Optimal positioning of a single local magnetic sensor for integrated dipole measurements / Grech, Christian (University of Malta (MT)) ; Buzio, Marco (CERN) ; Russenschuck, Stephan (CERN) ; Schwarz, Philip (CERN) ; Golluccio, Giancarlo (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE))
In this report, we seek the optimal position inside a dipole magnet where a single, small magnetic field sensor such as a Hall probe should be installed to derive with best accuracy the field integral along the magnet’s axis. [...]
CERN-ACC-NOTE-2019-0020.
- 2019. - 48 p.

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2019-05-28
06:57
Electron cloud formation in CERN particle accelerators and its impact on the beam dynamics / Romano, Annalisa
In high energy accelerators operating with positively charged particles, photoemission and secondary emission can give rise to an exponential electron multiplication within the beam chamber, which leads to the formation of a so-called Electron Cloud (EC) [...]
136 p.

TU Darmstadt server - Fulltext
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2019-05-28
06:57
10 kA Joints for HTS Roebel Cables / Murtomaki, Jaakko Samuel (CERN) ; Kirby, Glyn (CERN) ; van Nugteren, Jeroen (CERN) ; Contat, Pierre-Antoine (CERN) ; Sacristan-de-Frutos, Oscar (CERN) ; Fleiter, Jerome (CERN) ; Pincot, Francois-Olivier (CERN) ; de Rijk, Gijs (CERN) ; Rossi, Lucio (CERN) ; Ruuskanen, Janne (Tampere U. of Tech.) et al.
Future high temperature superconductor (HTS) high field magnets using multitape HTS cables need 10-kA low-resistance connections. The connections are needed between the poles of the magnets and at the terminals in a wide-operating temperature range, from 1.9-85 K. [...]
2018 - 6 p. - Published in : IEEE Trans. Appl. Supercond. 28 (2018) 4801406
In : 25th International Conference on Magnet Technology, Amsterdam, The Netherlands, 27 Aug - 1 Sep 2017, pp.4801406

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2019-05-28
06:57
Idealized Coil Cross-Sections with Minimized Conductor Area for High Field Dipoles / van Nugteren, Jeroen (CERN) ; Wolf, Felix (CERN) ; Murtomäki, Jaakko Samuel (CERN) ; Kirby, Glyn (CERN) ; de Rijk, Gijs (CERN) ; Ten Kate, Herman (CERN) ; Rossi, Lucio (CERN)
In the design of superconducting accelerator magnets, the shape of the coil cross-section is mainly driven by the minimization of the conductor volume, constrained by requirements on the central magnetic field and its homogeneity. Such optimizations commonly assume either a Block or Cosine Theta coil type, which is then filled with (pre-determined) rectangular or key-stoned Rutherford cables. [...]
2018 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 29 (2018) 4901505
In : 25th International Conference on Magnet Technology, Amsterdam, The Netherlands, 27 Aug - 1 Sep 2017, pp.4901505

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2019-05-23
13:43
Motorized linear stages for the UA9 experiment / Natochii, Andrii (Centre National de la Recherche Scientifique (FR)) ; Gavrikov, Yury (NRC Kurchatov Institute PNPI (RU)) ; Garattini, Marco (Imperial College (GB)) ; Scandale, Walter (CERN)
In this paper, we describe the mechanical structure of the motorized linear stages that are used for plas- tic scintillator detector placement in a high-energy particle beam during the dedicated UA9 collaboration measurements at CERN, including a detailed overview of the software. [...]
CERN-EN-2019-001.
- 2019. - 15 p.
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2019-05-23
06:31
Plasma impedance prediction model and impedance matching by frequency tuning in radio frequency negative ion sources / Kobayashi, W (Keio U.) ; Nishida, K (Keio U.) ; Mattei, S (CERN) ; Lettry, J (CERN) ; Hatayama, A (Keio U.)
A radio frequency (RF) driven type hydrogen (H−) source is used as an injector of Linac4. The power transfer efficiency between the RF generator and the ion source plasma is one of the important parameters that determines the extracted H− beam current. [...]
2018 - 3 p. - Published in : AIP Conf. Proc. 2011 (2018) 050019
In : International Conference on Ion Sources, CERN Geneva, Geneva, Switzerland, 15 - 20 Oct 2017, pp.050019

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