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2018-10-20
06:01
Numerical simulation of long rods impacted by particle beams / Portelli, Marcus (CERN ; U. Malta) ; Bertarelli, A (CERN) ; Carra, F (CERN) ; Mettler, L  K (CERN) ; Mollicone, P (U. Malta) ; Sammut, N (U. Malta)
Analytical solutions detailing the propagation of longitudinal waves in slender rods subjected to a sudden increase of internal energy provide simple tools for the calculation of the temperature distribution in impacted rods as well as the resulting mechanical response. The topic is of great interest in particle accelerator technology, especially with regards to collimation systems, where beam intercepting devices can be generally approximated to one-dimensional (1D) elements potentially subjected, in accidental scenarios, to abrupt thermal energy depositions induced by the impacting particles. [...]
2018 - 13 p. - Published in : Phys. Rev. Accel. Beams 21 (2018) 063501 Fulltext: PDF;

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2018-10-19
10:14
Experimental Assessment of Crystal Collimation at the Large Hadron Collider / Rossi, Roberto
The crystal collimation of hadron beams relies on the usage of highly pure bent crystals to deflect halo particles coherently and steer them onto optimised beam absorber blocks [...]
CERN-THESIS-2017-424 - 163 p.

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2018-10-19
06:47
Measurement and calculation of thermal neutrons induced by the 24 GeV$/c$ proton bombardment of a thick copper target / Oyama, T (KEK, Tsukuba) ; Hagiwara, M (KEK, Tsukuba) ; Sanami, T (KEK, Tsukuba) ; Yashima, H (Kyoto U. (main)) ; Nakao, N (Shimizu, Tokyo) ; Lee, E J (Kyushu U.) ; Iliopoulou, E (CERN ; Aristotle U., Thessaloniki) ; Froeschl, R (CERN) ; Infantino, A (CERN) ; Roesler, S (CERN)
The CERN High-Energy AcceleRator Mixed field (CHARM) facility provides a secondary particle field, produced by irradiating a thick target with 24 GeV$/c$ protons supplied by the proton synchrotron. In order to investigate the thermalization process of secondary neutrons in the CHARM facility, we measured the thermal neutrons using the gold foil activation method. [...]
2018 - 8 p. - Published in : Nucl. Instrum. Methods Phys. Res., B 434 (2018) 29-36

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2018-10-19
06:47
A low energy ion beamline for TwinEBIS / Pahl, H (CERN ; Heidelberg U.) ; Bencini, V (CERN ; INFN, Rome ; Rome U.) ; Breitenfeldt, M (CERN ; ADAM, Geneva) ; Granadeiro Costa, A R (CERN ; IST, Lisbon (main)) ; Pikin, A (CERN ; Brookhaven Natl. Lab.) ; Pitters, J (CERN) ; Wenander, F (CERN)
A low energy beamline has been designed for the TwinEBIS setup. The beamline will be used to transport ions extracted from the electron beam ion source into an accelerating radio frequency quadrupole or into secondary devices, like a time of flight-mass spectrometer, attached to the beamline via a fast three way 20° ion switchyard. [...]
2018 - 21 p. - Published in : JINST 13 (2018) P08012 Fulltext: pdf - PDF; 10.1088_1748-0221_13_08_P08012 - PDF;

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2018-10-18
13:31
Investigation on metallic high vacuum gaskets in conjunction with quick-disconnects for circular and large rectangular flanges / Kuhn, H K
CERN-LabII-Tech-Note-72-004-BT ; LabII-BT-HK-EEK-E-4. - 1972. - 16 p.
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2018-10-18
09:02
Distributed Optical Fiber Radiation Sensing in the Proton Synchrotron Booster at CERN / Di Francesca, D (CERN) ; Toccafondo, I (CERN) ; Li Vecchi, G (CERN ; Lab. Hubert Curien, St. Etienne) ; Calderini, S (CERN) ; Girard, S (Lab. Hubert Curien, St. Etienne) ; Alessi, A (Lab. Hubert Curien, St. Etienne) ; Ferraro, R (CERN) ; Danzeca, S (CERN) ; Kadi, Y (CERN) ; Brugger, M (CERN)
In this paper, we report on the development and first deployment of a distributed optical fiber radiation sensor (DOFRS) for the online monitoring of radiation levels in the high-energy accelerator facilities of CERN. [...]
2018. - 6 p.

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2018-10-18
09:02
Metrological Characterization of Nuclear Magnetic Resonance Markers for Real-Time Field Control of the CERN ELENA Ring Dipoles / Grech, Christian (CERN ; U. Malta) ; Avramidou, Rachel (CERN ; U. Derby) ; Beaumont, Anthony (CERN ; Ecole Polytechnique, Lausanne) ; Buzio, Marco (CERN) ; Sammut, Nicholas (U. Malta) ; Tinembart, Jacques (METROLAB, Geneva)
Field markers in particle accelerators are used to provide a digital trigger when the magnetic field reaches a preset threshold. [...]
2018. - 8 p.

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2018-10-17
06:01
Beam measurement of the high frequency impedance sources with long bunches in the CERN Super Proton Synchrotron / Lasheen, A (CERN ; Orsay) ; Argyropoulos, T (CERN) ; Bohl, T (CERN) ; Esteban Müller, J  F (CERN) ; Timko, H (CERN) ; Shaposhnikova, E (CERN)
Microwave instability in the Super Proton Synchrotron (SPS) at CERN is one of the main limitations to reach the requirements for the High Luminosity-LHC project (increased beam intensity by a factor 2). To identify the impedance source responsible of the instability, beam measurements were carried out to probe the SPS impedance. [...]
2018 - 13 p. - Published in : Phys. Rev. Accel. Beams 21 (2018) 034401 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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2018-10-12
14:26
Natural sources of geomagnetic field variations / Heilig, Balázs (Mining and Geological Survey of Hungary, Tihany, Hungary) ; Beggan, Ciarán (British Geological Survey, United Kingdom) ; Lichtenberger, János (Eötvös University, Budapest, Hungary)
The Earth’s magnetic field is a dynamic system and varies on a wide spectrum of timescales from microseconds to hundreds of millions of years. [...]
CERN-ACC-2018-0033 ; CLIC-Note-1083. - 2018. - 16 p.
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