CERN Accelerating science

CERN Published Articles

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2018-05-24
06:01
Numerical simulation of the RF plasma discharge in the Linac4 H$^−$ ion source / Mattei, S (CERN ; CRPP, Lausanne) ; Nishida, K (Keio U.) ; Onai, M (Keio U.) ; Lettry, J (CERN) ; Tran, M Q (CRPP, Lausanne) ; Hatayama, A (Keio U.)
This paper presents a Particle-In-Cell Monte Carlo Collision simulation of the Radio-Frequency (RF) plasma heating in the Linac4 H$^−$ ion source at CERN. The model self-consistently takes into account the electromagnetic field generated by the RF coil, the external static magnetic fields and the resulting plasma response, including a kinetic description of the charged species (e$^−$, H$^+$, H$^+_2$, H$^+_3$, H$^−$), as well as the atomic and molecular (vibrationally resolved) populations. [...]
2017 - 7 p. - Published in : AIP Conf. Proc. 1869 (2017) 030018
In : 5th International Symposium on Negative Ions, Beams and Sources, Oxford, United Kingdom, 12 - 16 Sep 2016, pp.030018

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2018-05-24
06:01
Influence of the cusp field on the plasma parameters of the Linac4 H− ion source / Briefi, S (U. Augsburg (main)) ; Mattei, S (CERN) ; Lettry, J (CERN) ; Fantz, U (U. Augsburg (main) ; Garching, Max Planck Inst. Plasmaphys.)
When the H$^−$ ion source of CERN’s Linac4 is operated in volume mode, a maximum of the extracted current is obtained at varying RF power. The power required for this maximum and its absolute value is strongly influenced by the cusp magnets installed at the source for electron confinement: without magnets, 15−20 mA are typically obtained at 20 kW whereas with magnets a factor of two more power is needed and 25−30 mA are achieved. [...]
2017 - 10 p. - Published in : AIP Conf. Proc. 1869 (2017) 030016
In : 5th International Symposium on Negative Ions, Beams and Sources, Oxford, United Kingdom, 12 - 16 Sep 2016, pp.030016

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2018-05-24
06:01
Implantation of cobalt in SnO2 thin films studied by TDPAC / Schell, Juliana (CERN ; U. Duisburg-Essen) ; Lupascu, Doru C (U. Duisburg-Essen) ; Carbonari, Artur Wilson (IPEN, Sao Paulo) ; Mansano, Ronaldo Domingues (U. Sao Paulo (main)) ; Dang, Thien Thanh (Bonn U., HISKP) ; Vianden, Reiner (Bonn U., HISKP)
Here we report time differential perturbed angular correlation (TDPAC) results of Co-doped SnO2 thin films. Making use of stable Co and radioactive 111In implanted at the Bonn Radioisotope Separator with energies of 80 keV and 160 keV, respectively, it was possible to study the dopant incorporation and its lattice location during annealing. [...]
2017 - 6 p. - Published in : AIP Adv. 7 (2017) 055304 Fulltext: PDF;

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2018-05-24
06:01
Perturbed angular correlations at ISOLDE: A 40 years young technique / Schell, Juliana (CERN ; U. Duisburg-Essen) ; Schaaf, Peter (Ilmenau Tech. U.) ; Lupascu, Doru C (U. Duisburg-Essen)
The idea that “new-is-small” is a paradigm propelling industries and research: new materials for new applications and new technologies. Precise and efficient characterization techniques are, therefore, required to make the “new” and the “small”, understandable, applicable, and reliable. [...]
2017-10-26 : , - 8 p. - Published in : AIP Adv. 7 (2017) 105017 Fulltext: PDF;

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2018-05-24
06:01
Modeling the Galactic center emission from GeV to PeV / Marinelli, A (INFN, Pisa ; Pisa U.) ; Gaggero, D (U. Amsterdam, GRAPPA) ; Grasso, D (INFN, Pisa ; Pisa U.) ; Taoso, M (CERN) ; Urbano, A (Madrid, IFT) ; Valli, M (INFN, Rome ; Rome U.)
The H.E.S.S. collaboration recently reported a new analysis of the gamma-ray diffuse emission from a “semi-annulus” region of 1.4 × 10−4 steradiants around Sagittarius A*. [...]
2017 - 5 p. - Published in : EPJ Web Conf. 136 (2017) 03016 Fulltext: PDF;
In : 6th Roma International Workshop on Astroparticle Physics, Rome, Italy, 21 - 24 Jun 2016, pp.03016

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2018-05-24
06:01
Anomalies in the gamma-ray diffuse emission of the Galaxy and implications for the interpretation of IceCube results / Grasso, D (INFN, Pisa ; Pisa U.) ; Gaggero, D (U. Amsterdam, GRAPPA) ; Marinelli, A (INFN, Pisa ; Pisa U.) ; Taoso, M (CERN) ; Urbano, A (Madrid, IFT) ; Valli, M (INFN, Rome ; Rome U.)
Several independent analyzes of Fermi-LAT results found evidences of an excess of $\gamma$-ray diffuse emission along the inner Galactic plane and of a related spatial dependence of the cosmic ray (CR) proton spectral index. These features are not accounted for by conventional models of CR transport. [...]
2017 - 4 p. - Published in : EPJ Web Conf. 136 (2017) 03014 Fulltext: PDF;
In : 6th Roma International Workshop on Astroparticle Physics, Rome, Italy, 21 - 24 Jun 2016, pp.03014

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2018-05-24
06:01
The efficient photodesorption of nitric oxide (NO) ices / Dupuy, R (LERMA, Ivry) ; Féraud, G (LERMA, Ivry) ; Bertin, M (LERMA, Ivry) ; Michaut, X (LERMA, Ivry) ; Putaud, T (LERMA, Ivry) ; Jeseck, P (LERMA, Ivry) ; Philippe, L (LERMA, Ivry) ; Romanzin, C (Paris, Lab Chim. Phys.) ; Baglin, V (CERN) ; Cimino, R (Frascati) et al.
The study and quantification of UV photon-induced desorption of frozen molecules furthers our understanding of the chemical evolution of cold interstellar regions. Nitric oxide (NO) is an important intermediate species in both gas-phase and solid-phase chemical networks. [...]
2017 - 4 p. - Published in : Astron. Astrophys. 606 (2017) L9

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2018-05-24
06:01
Spatial distribution of star formation related to ionized regions throughout the inner Galactic plane / Palmeirim, P (Marseille, Lab. Astrophys. ; Porto U., Astron. Dept.) ; Zavagno, A (Marseille, Lab. Astrophys.) ; Elia, D (INAF, Rome) ; Moore, T J T (Liverpool John Moores U., ARI) ; Whitworth, A (Cardiff U.) ; Tremblin, P (MdlS, Saclay) ; Traficante, A (INAF, Rome) ; Merello, M (INAF, Rome) ; Russeil, D (Marseille, Lab. Astrophys.) ; Pezzuto, S (INAF, Rome) et al.
We present a comprehensive statistical analysis of star-forming objects located in the vicinities of 1360 bubble structures throughout the Galactic plane and their local environments. The compilation of ~70 000 star-forming sources, found in the proximity of the ionized (HII) regions and detected in both Hi-GAL and GLIMPSE surveys, provided a broad overview of the different evolutionary stages of star-formation in bubbles, from prestellar objects to more evolved young stellar objects (YSOs). [...]
2017 - 14 p. - Published in : Astron. Astrophys. 605 (2017) A35

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2018-05-24
06:01
A Random Categorization Model for Hierarchical Taxonomies / D'Amico, Guido (CERN ; New York U., CCPP) ; Rabadan, Raul (Columbia U. (main)) ; Kleban, Matthew (New York U., CCPP)
A taxonomy is a standardized framework to classify and organize items into categories. Hierarchical taxonomies are ubiquitous, ranging from the classification of organisms to the file system on a computer. [...]
2017 - 13 p. - Published in : Sci. Rep. 7 (2017) 17051 Fulltext: PDF;

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2018-05-24
06:01
Towards large-scale in free-standing graphene and N-graphene sheets / Tatarova, E (IST, Lisbon (main)) ; Dias, A (IST, Lisbon (main)) ; Henriques, J (IST, Lisbon (main)) ; Abrashev, M (Sofiya U.) ; Bundaleska, N (IST, Lisbon (main)) ; Kovacevic, E (Orleans, GREMI) ; Bundaleski, N (New Lisbon U.) ; Cvelbar, U (Stefan Inst., Ljubljana) ; Valcheva, E (Sofiya U.) ; Arnaudov, B (Sofiya U.) et al.
One of the greatest challenges in the commercialization of graphene and derivatives is production of high quality material in bulk quantities at low price and in a reproducible manner. The very limited control, or even lack of, over the synthesis process is one of the main problems of conventional approaches. [...]
2017 - Published in : Sci. Rep. 7 (2017) 10175 Fulltext: PDF; External link: Fulltext

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