# All CERN Accelerators documents

უკანასკნელი დამატებები:
2018-05-25
14:56
 PcInterlock: Implementation and Operational Experience with the Optics Interlock / Schaumann, Michaela (CERN) ; Calia, Andrea (CERN) ; Fuchsberger, Kajetan (CERN) ; Wenninger, Jorg (CERN) In 2016 the luminosity reach of the LHC was increased by reducing the β-function in the main collision points below the design value to β∗ = 40 cm. [...] CERN-BE-2018-001. - 2018. - 19 p.

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

2018-05-24
08:05
 Design and Vertical Tests of SPS-series Double-Quarter Wave (DQW) Cavity Prototypes for the HL-LHC Crab Cavity System / Verdú-Andrés, S. (Brookhaven) ; Artoos, K. (CERN) ; Belomestnykh, S. (Brookhaven ; Fermilab ; SUNY, Stony Brook) ; Ben-Zvi, I. (Brookhaven ; SUNY, Stony Brook) ; Boulware, C. (Unlisted, US, MI) ; Burt, G. (Lancaster U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Calaga, R. (CERN) ; Capatina, O. (CERN) ; Carra, F. (CERN) ; Castilla, A. (CERN) et al. Crab crossing is essential for high-luminosity colliders. [...] arXiv:1805.08123 ; FERMILAB-PUB-18-207-TD. - Fulltext

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

2018-05-23
18:04
 Thermomechanical study of complex structures in the aperture of superconducting magnets: Application to the design of the High-Luminosity LHC shielded beam screen / Morrone, Marco In the framework of the High-Luminosity Large Hadron Collider (HL-LHC) project, a complex structure, known as the beam screen, will be installed by 2024 in the aperture of the inner triplet superconducting magnets nearby the ATLAS and CMS experiments [...] CERN-THESIS-2018-052 - 202 p.

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2018-05-23
11:26
 LHC Luminosity Performance / Hostettler, Michi This thesis adresses several approaches with the common goal of assessing, understanding and improving the luminosity of the Large Hadron Collider (LHC) [...] CERN-THESIS-2018-051 -

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2018-05-23
10:57
 Specifications for conductors and proposed conductor configurations: Milestone M5.3 / Bordini, Bernardo (CERN) ; Senatore, Carmine ; Dhallé, Marc (University of Twente) This document summarises the specifications of a superconductor suitable to be used in a particle accelerator dipole magnet that can reach a field of 16 Tesla during regular operation. The document reports also on the conductor configuration. [...] CERN-ACC-2018-0015.- Geneva : CERN, 2018 Fulltext: PDF;

2018-05-23
06:00
 Autopilot regulation for the Linac4 H$^−$ ion source / Voulgarakis, G (CERN) ; Lettry, J (CERN) ; Mattei, S (CERN) ; Lefort, B (CERN) ; Correia Costa, V J (CERN) Linac4 is a 160 MeV H$^−$ linear accelerator part of the upgrade of the LHC injector chain. Its cesiated surface H$^−$ source is designed to provide a beam intensity of 40-50mA. [...] 2017 - 11. - Published in : AIP Conf. Proc. 1869 (2017) 030012 In : 5th International Symposium on Negative Ions, Beams and Sources, Oxford, United Kingdom, 12 - 16 Sep 2016, pp.030012