CERN Accelerating science

All CERN Accelerators documents

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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.
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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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2018-05-23
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;

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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

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2018-05-23
06:00
Characterization of the n_TOF EAR-2 neutron beam / Chen, Y H (Orsay, IPN) ; Tassan-Got, L (Orsay, IPN) ; Audouin, L (Orsay, IPN) ; Le Naour, C (Orsay, IPN) ; Durán, I (U. Santiago de Compostela (main)) ; Casarejos, E (Vigo U.) ; Aberle, O (CERN) ; Andrzejewski, J (U. Lodz (main)) ; Bécares, V (Madrid, CIEMAT) ; Bacak, M (TU Vienna) et al. /n_TOF
The experimental area 2 (EAR-2) at CERNs neutron time-of-flight facility (n_TOF), which is operational since 2014, is designed and built as a short-distance complement to the experimental area 1 (EAR-1). The Parallel Plate Avalanche Counter (PPAC) monitor experiment was performed to characterize the beam profile and the shape of the neutron flux at EAR-2. [...]
2017 - 4 p. - Published in : EPJ Web Conf. 146 (2017) 03020 Fulltext: PDF;
In : ND 2016 International Conference on Nuclear Data for Science and Technology, Bruges, Belgium, 11 - 16 Sep 2016, pp.03020

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2018-05-22
16:30
Social Cost Benefit Analysis of HL-LHC / Bastianin, Andrea (Università degli Studi e INFN Milano (IT)) ; Florio, Massimo (Università degli Studi e INFN Milano (IT))
We present a Social Cost–Benefit Analysis (CBA) of the High Luminosity upgrade of the Large Hadron Collider (HL-LHC), assessing its economic costs and benefits up to 2038. The Net Present Value (NPV) of the HL-LHC project is positive at the end of the observation period. [...]
CERN-ACC-2018-0014.- Geneva : CERN, 2018 Fulltext: FCC-1805221620-ABA_OverviewCBA_HLLHCandFCC - XLSX; FCC-1805221620-ABA_OverviewCBA_HLLHCandFCC_2 - XLSX; CERN-ACC-2018-0014 - PDF;

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2018-05-22
11:55
LHCb Upgrades and operation at 1034 cm-2 s-1 luminosity –A first study / Efthymiopoulos, Ilias (CERN) ; Arduini, Gianluigi (CERN) ; Baglin, Vincent (CERN) ; Burkhardt, Helmut (CERN) ; Cerutti, Francesco (CERN) ; Claudet, Serge (CERN) ; Di Girolamo, Beniamino (CERN) ; De Maria, Riccardo (CERN) ; Esposito, Luigi Salvatore (CERN) ; Karastathis, Nikos (CERN) et al.
Presently, the LHCb experiment at IP8 operates at reduced luminosity (~4.0 1032 cm-2 s-1) compared to ATLAS and CMS experiments. [...]
CERN-ACC-NOTE-2018-0038.
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