CERN Accelerating science

All CERN Accelerators documents

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2017-07-21
06:52
Mechanical Effects of the Nonuniform Current Distribution on HTS Coils for Accelerators Wound With REBCO Roebel Cable / Murtomaki, Jaakko S (Tampere U. of Tech.) ; van Nugteren, Jeroen (Twente U., Enschede) ; Kirby, Glyn (CERN) ; Rossi, Lucio (CERN) ; Ruuskanen, Janne (Tampere U. of Tech.) ; Stenvall, Antti (Tampere U. of Tech.)
Future high-energy accelerators will need very high magnetic fields in the range of 20 T. [...]
2017. - 5 p.

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2017-07-21
06:52
Optimization of Nb$_{3}$Sn Rutherford Cables Geometry for the High Luminosity LHC / Fleiter, Jerome (CERN) ; Ballarino, Amalia (CERN) ; Bonasia, Angelo (CERN) ; Bordini, Bernardo (CERN) ; Richter, David (CERN)
The quadrupole and dipole magnets for the LHC High Luminosity (HL-LHC) upgrade will be based on Nb3Sn Rutherford cables that operate at 1.9 K and experience magnetic fields of up to about 12 T. An important step in the design of these magnets is the development of the high aspect ratio Nb3Sn cables to achieve the nominal field with sufficient margin. [...]
2017 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 27 (2017) 4004305
In : Applied Superconductivity Conference, Denver, CO, USA, 4 - 9 Sep 2016, pp.4004305

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2017-07-21
06:52
Training Behavior of the Main Dipoles in the Large Hadron Collider / Todesco, Ezio (CERN) ; Auchmann, Bernhard (CERN) ; Bajko, Marta (CERN) ; Bottura, Luca (CERN) ; Bruning, Oliver (CERN) ; De Rijk, Gijs (CERN) ; Fessia, Paolo (CERN) ; Hagen, Per (CERN) ; Naour, Sandrine Le (CERN) ; Modena, Michele (CERN) et al.
In 2015, the 1232 Nb-Ti dipole magnets in the Large Hadron Collider (LHC) have been commissioned to 7.8 T operational field, with 172 quenches. More than 80% of these quenches occurred in the magnets of one of the three cold mass assemblers (3000 series), confirming what was already observed in 2008. [...]
2017 - 7 p. - Published in : IEEE Trans. Appl. Supercond. 27 (2017) 4702807
In : Applied Superconductivity Conference, Denver, CO, USA, 4 - 9 Sep 2016, pp.4702807

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2017-07-21
06:52
The AEgIS experiment at CERN: measuring antihydrogen free-fall in earth’s gravitational field to test WEP with antimatter / Brusa, R S (Trento U. ; TIFPA-INFN, Trento) ; Amsler, C (U. Bern, AEC) ; Ariga, T (Bern U., LHEP) ; Bonomi, G (U. Brescia ; INFN, Pavia) ; Bräunig, P (Kirchhoff Inst. Phys.) ; Cabaret, L ; Caccia, M (INFN, Milan ; Insubria U., Como) ; Caravita, R (Genoa U. ; INFN, Genoa) ; Castelli, F (INFN, Milan ; Milan U.) ; Cerchiari, G (Heidelberg, Max Planck Inst.) et al.
The AEgIS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) experiment is designed with the objective to test the weak equivalence principle with antimatter by studying the free fall of antihydrogen in the Earth’s gravitational field. A pulsed cold beam of antihydrogen will be produced by charge exchange between cold Ps excited in Rydberg state and cold antiprotons. [...]
2017 - 8 p. - Published in : J. Phys. : Conf. Ser. 791 (2017) 012014

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2017-07-21
06:52
RILIS-ionized mercury and tellurium beams at ISOLDE CERN / Day Goodacre, T (CERN ; Manchester U.) ; Billowes, J (Manchester U.) ; Chrysalidis, K (CERN ; Mainz U., Inst. Phys.) ; Fedorov, D V (St. Petersburg, INP) ; Fedosseev, V N (CERN) ; Marsh, B A (CERN) ; Molkanov, P L (St. Petersburg, INP) ; Rossel, R E (CERN ; Mainz U., Inst. Phys. ; Hokkaido U.) ; Rothe, S (CERN ; Manchester U.) ; Seiffert, C (CERN) et al.
This paper presents the results of ionization scheme development for application at the ISOLDE Resonance Ionization Laser Ion Source (RILIS). Two new ionization schemes for mercury are presented: a three-step three-resonance ionization scheme, ionizing via an excitation to a Rydberg level and a three-step two-resonance ionization scheme, with a non-resonant final step to the ionization continuum that corresponded to a factor of four higher ionization efficiency. [...]
2017 - 10 p. - Published in : Hyperfine Interact. 238 (2017) 41
In : 10th International Workshop on Application of Lasers and Storage Devices in Atomic Nuclei Research : Recent Achievements and Future Prospects, Poznan, Poland, 16 - 19 May 2016, pp.41

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2017-07-19
07:15
ELECTRON CLOUD AND COLLECTIVE EFFECTS IN THE INTERACTION REGION OF FCC-ee / Belli, E (INFN, Rome) ; Migliorati, M (INFN, Rome) ; Rumolo, G (CERN)
The FCC-ee is an e⁺e⁻ circular collider designed to accommodate four different experiments in a beam energy range from 91 to 350 GeV and is a part of the Future Circular Collider (FCC) project at CERN. One of the most critical aspects of this new very challenging machine regards the collective effects which can produce instabilities, thus limiting the accelerator operation and reducing its performance. [...]
eeFACT-2016-TUT3AH7.- 2016 - Published in : 10.18429/JACoW-eeFACT2016-TUT3AH7 Fulltext: PDF;

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2017-07-19
07:14
Performance of the first short model 150 mm aperture Nb$_3$Sn Quadrupole MQXFS for the High-Luminosity LHC upgrade / Chlachidze, G (Fermilab) ; Ambrosio, G (Fermilab) ; Anerella, M (Brookhaven) ; Bossert, R (Fermilab) ; Cavanna, E (CERN) ; Cheng, D (Fermilab) ; Dietderich, D (LBL, Berkeley) ; DiMarco, J (Fermilab) ; Felice, H (Saclay) ; Ferracin, P (CERN) et al. /LARP
The US LHC Accelerator Research Program (LARP) and CERN combined their efforts in developing Nb3Sn magnets for the High-Luminosity LHC upgrade. The ultimate goal of this collaboration is to fabricate large aperture Nb3Sn quadrupoles for the LHC interaction regions (IR). [...]
FERMILAB-CONF-16-340-TD.- 2016 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 27 (2017) 4000205 Fulltext: PDF; External link: FERMILABCONF
In : Applied Superconductivity Conference, Denver, CO, USA, 4 - 9 Sep 2016, pp.4000205

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2017-07-19
07:14
Magnetic Measurements of the First Nb$_3$Sn Model Quadrupole (MQXFS) for the High-Luminosity LHC / DiMarco, J (Fermilab) ; Ambrosio, G (Fermilab) ; Chlachidze, G (Fermilab) ; Ferracin, P (CERN) ; Holik, E (Fermilab) ; Sabbi, G (LBNL, Berkeley) ; Stoynev, S (Fermilab) ; Strauss, T (Fermilab) ; Sylvester, C (Fermilab) ; Tartaglia, M (Fermilab) et al. /LARP
The US LHC Accelerator Research Program (LARP) and CERN are developing high-gradient Nb3Sn magnets for the High Luminosity LHC interaction regions. Magnetic measurements of the first 1.5 m long, 150 mm aperture model quadrupole, MQXFS1, were performed during magnet assembly at LBNL, as well as during cryogenic testing at Fermilab’s Vertical Magnet Test Facility. [...]
FERMILAB-CONF-16-347-TD.- 2016 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 27 (2017) 9000105 Fulltext: PDF; External link: FERMILABCONF
In : Applied Superconductivity Conference, Denver, CO, USA, 4 - 9 Sep 2016, pp.9000105

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2017-07-18
06:30
A high-compression electron gun for C 6+ production: concept, simulations and mechanical design / Mertzig, Robert (CERN ; Dresden, Tech. U.) ; Breitenfeldt, M (CERN) ; Mathot, S (CERN) ; Pitters, J (CERN ; TU Vienna) ; Shornikov, A (U. Manchester (main) ; GANIL) ; Wenander, F (CERN)
In this paper we report on simulations and the mechanical design of a high-compression electron gun for an Electron Beam Ion Source (EBIS) dedicated for production of high intensity and high repetition rate pulses of bare carbon ions for injection into linac-based hadron therapy facilities. The gun is presently under construction at CERN to be retrofitted into the TwinEBIS test bench for experimental studies. [...]
2017 - 10 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 859 (2017) 102-111 Fulltext: PDF;

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2017-07-18
06:30
Reaching record-low $β^*$ at the CERN Large Hadron Collider using a novel scheme of collimator settings and optics / Bruce, R (CERN) ; Bracco, C (CERN) ; De Maria, R (CERN) ; Giovannozzi, M (CERN) ; Mereghetti, A (CERN) ; Mirarchi, D (CERN) ; Redaelli, S (CERN) ; Quaranta, E (CERN ; Milan Polytechnic) ; Salvachua, B (CERN)
The Large Hadron Collider (LHC) at CERN is built to collide intense proton beams with an unprecedented energy of 7 TeV. The design stored energy per beam of 362 MJ makes the LHC beams highly destructive, so that any beam losses risk to cause quenches of superconducting magnets or damage to accelerator components. [...]
2017 - 12 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 848 (2017) 19-30 Fulltext: PDF;

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