CERN Accelerating science

Published Articles

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2018-10-16
06:47
ICED—Inductively Coupled Energy Dissipater for Future High-Field Accelerator Magnets / Murtomäki, Jaakko Samuel (CERN) ; van Nugteren, Jeroen (CERN) ; Kirby, Glyn (CERN) ; de Rijk, Gijs (CERN) ; Rossi, Lucio (CERN) ; Stenvall, Antti (Tampere U. of Tech.)
Future high-field accelerator magnets, like the ones foreseen in the design study of the FCC project and for the EuCARD2 “Future Magnets” program, operate with magnetic fields in the range of 16-20 T. For such magnets the energy density is higher than in the accelerator magnets at present in operation, posing a challenge for the quench protection. [...]
2018 - 15 p. - Published in : IEEE Trans. Appl. Supercond. 28 (2018) 4009015

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2018-10-16
06:47
Fabrication and Assembly Performance of the First 4.2 m MQXFA Magnet and Mechanical Model for the Hi-Lumi LHC Upgrade / Cheng, Daniel W (LBNL, Berkeley) ; Ambrosio, Giorgio (Fermilab) ; Anderssen, Eric C (LBNL, Berkeley) ; Bourcey, Nicolas (CERN) ; Felice, Helene (Saclay) ; Ferracin, Paolo (CERN) ; Grosclaude, Philippe (CERN) ; Guinchard, Michael (CERN) ; Perez, Juan Carlos (CERN) ; Pan, Heng (LBNL, Berkeley) et al.
The LHC accelerator research program (LARP), in collaboration with CERN and under the scope of the high luminosity upgrade of the Large Hadron Collider, is in the prototyping stage in the development of a 150 mm aperture high-field Nb$_3$Sn quadrupole magnet called MQXF. This magnet is mechanically supported using a shell-based support structure, which has been extensively demonstrated on several R&D; models within LARP, as well as in the more recent short (1.2 m magnetic length) MQXF model program. [...]
FERMILAB-PUB-17-372-TD.- 2018 - 7 p. - Published in : IEEE Trans. Appl. Supercond. 28 (2018) 4006207 Fulltext: PDF; External link: FERMILABPUB

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2018-10-16
06:47
Study of the Secondary Electron Yield in Dielectrics Using Equivalent Circuital Models / Bañón-Caballero, David (CERN) ; Socuellamos, Juan M (Lancaster U. (main)) ; Mata, Rafael (Val Space Consortium, Valencia) ; Mercadé, Laura (U. Valencia (main)) ; Gimeno, Benito (U. Valencia (main)) ; Boria, Vicente E (Valencia, Polytechnic U.) ; Raboso, David (ESTEC, Noordwijk) ; Semenov, Vladimir E (Nizhnii Novgorod, IAP) ; Rakova, Elena I (Nizhnii Novgorod, IAP) ; Sanchez-Royo, Juan F (U. Valencia (main)) et al.
Secondary electron emission has an important role on the triggering of the multipactor effect; therefore, its study and characterization are essential in radio-frequency waveguide applications. In this paper, we propose a theoretical model, based on equivalent circuit models, to properly understand charging and discharging processes that occur in dielectric samples under electron irradiation for secondary electron emission characterization. [...]
2018 - 9 p. - Published in : IEEE Trans. Plasma Sci. 46 (2018) 859-867

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2018-10-16
06:47
Utopia: A Nine Decade Femtoampere Sensitivity Current Digitizer and its Application in Ionizing Radiation Monitoring / Voulgari, Evgenia (CERN) ; Noy, Matthew (CERN) ; Anghinolfi, Francis (CERN) ; Krummenacher, Francois (Ecole Polytechnique, Lausanne) ; Kayal, Maher (Ecole Polytechnique, Lausanne)
Radiation measurements and monitoring are very important for particle physics accelerators, hadron therapy institutes, and nuclear facilities. An Application Specific Integrated Circuit (ASIC) able to digitize current generated from ionization chambers was designed and characterized in order to be used as the front-end of the new radiation monitoring system at CERN. [...]
2018 - 9 p. - Published in : IEEE Trans. Nucl. Sci. 65 (2018) 932-940 Fulltext: PDF; External link: Fulltext

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2018-10-16
06:47
Preparation and characterization of  $^{33}$S samples for  $^{33}$S(n,$\alpha$) $^{30}$Si cross-section measurements at the n_TOF facility at CERN / Praena, J (Granada U.) ; Ferrer, F J (CNA, Seville) ; Vollenberg, W (CERN) ; Sabaté-Gilarte, M (Seville U. ; CERN) ; Fernández, B (CNA, Seville ; Seville U.) ; García-López, J (CNA, Seville ; Seville U.) ; Porras, I (Granada U.) ; Quesada, J M (Seville U.) ; Altstadt, S (Goethe U., Frankfurt (main)) ; Andrzejewski, J (Lodz U.) et al. /n_TOF
Thin  33 S samples for the study of the  33 S(n, α ) 30 Si cross-section at the n_TOF facility at CERN were made by thermal evaporation of  33 S powder onto a dedicated substrate made of kapton covered with thin layers of copper, chromium and titanium. This method has provided for the first time bare sulfur samples a few centimeters in diameter. [...]
2018 - 6 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 890 (2018) 142-147 Fulltext: PDF;

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2018-10-16
06:47
Examining mitigation schemes for synchrotron radiation in high-energy hadron colliders / Guillermo, G (Merida, IPN ; CERN) ; Sagan, D (Cornell U., CLASSE) ; Zimmermann, F (CERN)
At high proton-beam energies, beam-induced synchrotron radiation is an important source of heating, of beam-related vacuum pressure increase, and of primary photoelectrons, which can give rise to an electron cloud. We use the synrad3d code developed at Cornell to simulate the photon distributions in the arcs of several existing, planned, or proposed highest-energy hadron colliders to analyze the efficiency of several techniques developed, or proposed, to mitigate the negative effects of synchrotron radiation, such as a sawtooth surface and slots in the beam screen..
2018 - 7 p. - Published in : Phys. Rev. Accel. Beams 21 (2018) 021001 Fulltext: PDF;

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2018-10-16
06:47
Final focus system tuning studies towards Compact Linear Collider feasibility / Marin, E (CERN) ; Latina, A (CERN) ; Tomás, R (CERN) ; Schulte, D (CERN)
In this paper we present the latest results regarding the tuning study of the baseline design of the final focus system of the Compact Linear Collider (CLIC-FFS). CLIC aims to provide collisions to the experiments at a luminosity above $10^{34}  \text{cm}^{-2} \text{s}^{-1}$. [...]
2018 - 6 p. - Published in : Phys. Rev. Accel. Beams 21 (2018) 011003 Fulltext: PDF;

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2018-10-16
06:47
Comprehensive study of beam focusing by crystal devices / Scandale, W (CERN) ; Arduini, G (CERN) ; Cerutti, F (CERN) ; Garattini, M (CERN) ; Gilardoni, S (CERN) ; Masi, A (CERN) ; Mirarchi, D (CERN) ; Montesano, S (CERN) ; Petrucci, S (CERN) ; Redaelli, S (CERN) et al.
This paper is devoted to an experimental study of focusing and defocusing positively charged particle beams with the help of specially bent single crystals. Four crystals have been fabricated for this purpose. [...]
2018 - 11 p. - Published in : Phys. Rev. Accel. Beams 21 (2018) 014702 Fulltext: PDF;

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2018-10-16
06:47
Quadrupole-free detector optics design for the Compact Linear Collider final focus system at 3 TeV / Plassard, Fabien (CERN) ; Latina, Andrea (CERN) ; Marin, Eduardo (CERN) ; Tomás, Rogelio (CERN) ; Bambade, Philip (Orsay, LAL)
Aiming to simplify the machine detector interface of the Compact Linear Collider (CLIC), a new detector model has been designed allowing the last quadrupole QD0 of the final focus system (FFS) to be located outside of the experiment with a distance L* from the interaction point of 6 m. In this paper, the beam delivery system (BDS) has been reoptimized, offering a luminosity performance that exceeds the design requirements by 11% for the total luminosity and by 7% in the energy peak. [...]
2018 - 13 p. - Published in : Phys. Rev. Accel. Beams 21 (2018) 011002 Fulltext: PDF;

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2018-10-16
06:47
Measurements and FLUKA simulations of bismuth and aluminium activation at the CERN Shielding Benchmark Facility (CSBF) / Iliopoulou, E (CERN ; Aristotle U., Thessaloniki) ; Bamidis, P (Aristotle U., Thessaloniki) ; Brugger, M (CERN) ; Froeschl, R (CERN) ; Infantino, A (CERN) ; Kajimoto, T (Hiroshima U. (main)) ; Nakao, N (Shimizu, Tokyo) ; Roesler, S (CERN) ; Sanami, T (KEK, Tsukuba) ; Siountas, A (Aristotle U., Thessaloniki)
The CERN High Energy AcceleRator Mixed field facility (CHARM) is located in the CERN Proton Synchrotron (PS) East Experimental Area. The facility receives a pulsed proton beam from the CERN PS with a beam momentum of 24 GeV/c with $5 \cdot 10^{11}$ protons per pulse with a pulse length of 350 ms and with a maximum average beam intensity of $6.7 \cdot 10^{10}$ p/s that then impacts on the CHARM target. [...]
2018 - 7 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 885 (2018) 79-85

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