CERN Published Articles

Letzte Einträge:
2018-05-25
07:03
 Effects of the extraction voltage applied by the puller-electrode on the H$^−$ extraction in the Linac4 negative ion source / Abe, S (Keio U.) ; Nishioka, S (Keio U.) ; Mattei, S (CERN) ; Hatayama, A (Keio U.) ; Lettry, J (CERN) In order to understand the H$^−$ extraction mechanism and investigate the effect of the extraction voltage applied by the puller-electrode on the H$^−$ extraction in the Linac4 negative ion source, we are developing a 2D3V-PIC (two dimensions in the real space and three dimensions in the velocity space, Particle in Cell) model with volume produced H$^−$ ions. It is shown that how to take the magnetic filter field direction is important for the 2D modeling to take into account the important 3D effect of electron $E \times B$ drift. [...] 2017 - 8 p. - Published in : AIP Conf. Proc. 1869 (2017) 030051 In : 5th International Symposium on Negative Ions, Beams and Sources, Oxford, United Kingdom, 12 - 16 Sep 2016, pp.030051

2018-05-25
07:03
 Investigation of the RF efficiency of inductively coupled hydrogen plasmas at 1 MHz / Rauner, D (Garching, Max Planck Inst. Plasmaphys. ; U. Augsburg (main)) ; Mattei, S (CERN ; CRPP, Lausanne) ; Briefi, S (U. Augsburg (main)) ; Fantz, U ; Hatayama, A (Garching, Max Planck Inst. Plasmaphys. ; U. Augsburg (main)) ; Lettry, J (CERN) ; Nishida, K (Keio U.) ; Tran, M Q (CRPP, Lausanne) The power requirements of RF heated sources for negative hydrogen ions in fusion are substantial, which poses strong demands on the generators and components of the RF circuit. Consequently, an increase of the RF coupling efficiency would be highly beneficial. [...] 2017 - 8 p. - Published in : AIP Conf. Proc. 1869 (2017) 030035 In : 5th International Symposium on Negative Ions, Beams and Sources, Oxford, United Kingdom, 12 - 16 Sep 2016, pp.030035

2018-05-25
07:03
 Analyzing the impact of radiation-induced failures in flash-based APSoC with and without fault tolerance techniques at CERN environment / Tambara, L A (Rio Grande do Sul U., Porto Alegre (main)) ; Chielle, E (Rio Grande do Sul U., Porto Alegre (main)) ; Kastensmidt, F L (Rio Grande do Sul U., Porto Alegre (main)) ; Tsiligiannis, G (CERN) ; Danzeca, S (CERN) ; Brugger, M (CERN) ; Masi, A (CERN) All Programmable System-on-Chip (APSoC) devices are designed to provide higher overall programmable flexibility and system performance at lower costs. Such characteristics make APSoCs very suitable and attractive for critical environments, such as the one encountered in the accelerators chain of the European Organization for Nuclear Research (CERN), where electronic components can be exposed to high-energy hadrons (protons, neutrons, pions), heavy ions, and other particles, at the same time. [...] 2017 - 4 p. - Published in : Microelectron. Reliab. 76-77 (2017) 640-643

2018-05-25
07:03
 Current status of GALS setup in JINR / Zemlyanoy, S (Dubna, JINR) ; Avvakumov, K (Dubna, JINR) ; Fedosseev, V (CERN) ; Bark, R (iThemba LABS) ; Blazczak, Z (Mickiewicz U., Poznan) ; Janas, Z (Warsaw U.) This is a brief report on the current status of the new GAs cell based Laser ionization Setup (GALS) at the Flerov Laboratory for Nuclear Reactions (FLNR) of the Joint Institute for Nuclear Research (JINR) in Dubna. GALS will exploit available beams from the U-400M cyclotron in low energy multi-nucleon transfer reactions to study exotic neutron-rich nuclei located in the “north-east” region of nuclear map. [...] 2017 - 10 p. - Published in : Hyperfine Interact. 238 (2017) 31 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.31

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

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

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;

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;

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

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