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CERN Published Articles

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2022-05-26
04:43
Measurements of Proton High Order Cumulants in $\sqrt{s_{_{\mathrm{NN}}}}$ = 3 GeV Au+Au Collisions and Implications for the QCD Critical Point / STAR Collaboration
We report cumulants of the proton multiplicity distribution from dedicated fixed-target Au+Au collisions at 3.0 GeV, measured by the STAR experiment in the kinematic acceptance of rapidity ($y$) and transverse momentum ($p_{\rm T}$) within $-0.5 < y<0$ and $0.4 < p_{\rm T} <2.0 $ GeV/$c$. In the most central 0--5% collisions, a proton cumulant ratio is measured to be $C_4/C_2=-0.85 \pm 0.09 ~(\rm stat.) \pm 0.82 ~(\rm syst.)$, which is less than unity, the Poisson baseline. [...]
arXiv:2112.00240.- 2022-05-20 - 9 p. - Published in : Phys. Rev. Lett. 128 (2022) 202303 Fulltext: PDF;

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2022-05-26
04:02
Longitudinal double-spin asymmetry for inclusive jet and dijet production in polarized proton collisions at $\sqrt{s}=510$ GeV / STAR Collaboration
We report measurements of the longitudinal double-spin asymmetry, $A_{LL}$, for inclusive jet and dijet production in polarized proton-proton collisions at midrapidity and center-of-mass energy $\sqrt{s}$ = 510 GeV, using the high luminosity data sample collected by the STAR experiment in 2013. These measurements complement and improve the precision of previous STAR measurements at the same center-of-mass energy that probe the polarized gluon distribution function at partonic momentum fraction 0.015 $\lesssim x \lesssim$ 0.25. [...]
arXiv:2110.11020.- 2022-05-01 - 18 p. - Published in : Phys. Rev. D 105 (2022) 092011 Fulltext: PDF;

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2022-05-24
06:41
Design of a Very Low Energy Beamline for NA61/SHINE / Mussolini, Carlo Alberto (CERN ; JAI, UK) ; Burrows, Philip N (JAI, UK) ; Charitonidis, Nikolaos (CERN) ; Nagai, Yoshikazu (U. Colorado, Boulder) ; Zimmerman, Eric D (U. Colorado, Boulder)
A new, low-energy beamline branch is currently under consideration for the H₂ beamline at the CERN North Area. This new branch would extend the capabilities of the current infrastructure enabling the study of particles in the very low, 1-13 GeV/c, momentum range. [...]
Geneva : JACoW, 2021 - 4 p. - Published in : JACoW IPAC 2021 (2021) 4017-4020 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.4017-4020

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2022-05-24
06:41
The Consolidation of the CERN Beam Interlock System / Johnson, Roland (CERN) ; Martin, Christophe (CERN) ; Podzorny, Tomasz (CERN) ; Romera, Iván (CERN) ; Secondo, Raffaello (CERN) ; Uythoven, Jan (CERN)
The Beam Interlock System (BIS) is a machine protection system that provides essential interlock control throughout the CERN accelerator complex. The current BIS has been in service since 2006; as such, it is approaching the end of its operational lifetime, with most components being obsolete. [...]
Geneva : JACoW, 2021 - 4 p. - Published in : JACoW IPAC '21 (2021) 3309-3312 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.3309-3312

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2022-05-24
06:41
Detection and Classification of Collective Beam Behaviour in the LHC / Coyle, Loic (Ecole Polytechnique, Lausanne ; CERN) ; Blanc, Frederic (Ecole Polytechnique, Lausanne) ; Buffat, Xavier (CERN) ; Krymova, Ekaterina (Ecole Polytechnique, Lausanne ; Zurich, ETH) ; Obozinski, Guillaume (Ecole Polytechnique, Lausanne ; Zurich, ETH) ; Pieloni, Tatiana (Ecole Polytechnique, Lausanne ; CERN) ; Schenk, Michael (Ecole Polytechnique, Lausanne ; CERN) ; Solfaroli Camillocci, Matteo (CERN) ; Wenninger, Jorg (CERN)
Collective instabilities can lead to a severe deterioration of beam quality, in terms of reduced beam intensity and increased beam emittance, and consequently a reduction of the collider’s luminosity. It is therefore crucial for the operation of the CERN’s Large Hadron Collider to understand the conditions in which they appear in order to find appropriate mitigation measures. [...]
Geneva : JACoW, 2021 - 4 p. - Published in : JACoW IPAC 2021 (2021) 4318-4321 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.4318-4321

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2022-05-24
06:41
A Mechanism for Emittance Growth Based on Non-Linear Islands in LHC / Maclean, Ewen H (CERN) ; Giovannozzi, Massimo (CERN) ; Persson, Tobias H B (CERN) ; Tomás García, Rogelio (CERN)
Landau octupoles are used in the LHC to prevent coherent instabilities of the circulating beam. The reduction of their strength occurring during the energy ramp can transport particles in nonlinear islands to larger amplitude. [...]
Geneva : JACoW, 2021 - 4 p. - Published in : JACoW IPAC 2021 (2021) 4082-4085 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.4082-4085

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2022-05-24
06:41
Beam Induced Power Deposition in CERN SPS Injection Kickers / Barnes, Michael J (CERN) ; Bjorkqvist, Oskar (CERN) ; Kodama, Kota (CERN ; KEK, Tsukuba)
The SPS injection kicker magnets (MKP) were developed in the 1970’s, before beam power deposition was considered an issue and before any advanced tools for analysing beam coupling impedance were available in their current form. These magnets are very lossy from a beam impedance perspective, and the beam induced power deposition is highly non-uniform. [...]
Geneva : JACoW, 2021 - 4 p. - Published in : JACoW IPAC 2021 (2021) 3490-3493 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.3490-3493

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2022-05-23
10:35
Quantum gravity phenomenology at the dawn of the multi-messenger era—A review / Addazi, A. (SCU, Chengdu ; Frascati) ; Alvarez-Muniz, J. (Santiago de Compostela U., IGFAE) ; Alves Batista, R. (Madrid, IFT) ; Amelino-Camelia, G. (Naples U. ; INFN, Naples) ; Antonelli, V. (Milan U. ; INFN, Milan) ; Arzano, M. (Naples U. ; INFN, Naples) ; Asorey, M. (Zaragoza U.) ; Atteia, J.-L. (IRAP, Toulouse) ; Bahamonde, S. (Tartu, Inst. Phys. ; Tokyo Inst. Tech.) ; Bajardi, F. (Naples U.) et al.
The exploration of the universe has recently entered a new era thanks to the multi-messenger paradigm, characterized by a continuous increase in the quantity and quality of experimental data that is obtained by the detection of the various cosmic messengers (photons, neutrinos, cosmic rays and gravitational waves) from numerous origins. They give us information about their sources in the universe and the properties of the intergalactic medium. [...]
arXiv:2111.05659.- 2022-07 - 119 p. Fulltext: PDF;

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2022-05-21
06:07
Design, Construction and Testing of a Magnetic Probe for Fast Kicker Magnets / Ayala Cintas, Núria (CERN) ; Ferrero Colomo, Álvaro (CERN) ; Kramer, Thomas (CERN)
The CERN PS injection kicker has been modified in the framework of the LHC Injector Upgrade (LIU) project to allow injecting proton beams with an energy of 2 GeV. One of the most important items of the system parameter validation is the measurement and analysis of the magnetic field in the magnet aperture. [...]
Geneva : JACoW, 2021 - 4 p. - Published in : JACoW IPAC 2021 (2021) 3510-3513 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.3510-3513

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2022-05-21
06:07
An experimental study of focused very high energy electron beams for radiotherapy / Kokurewicz, Karolina (Glasgow U.) ; Brunetti, Enrico (Glasgow U.) ; Curcio, Alessandro (CERN) ; Gamba, Davide (CERN) ; Garolfi, Luca (CERN) ; Gilardi, Antonio (CERN ; U. Naples (main) ; INFN, Naples) ; Senes, Eugenio (CERN ; JAI, UK) ; Sjobak, Kyrre Ness (CERN ; U. Oslo (main)) ; Farabolini, Wilfrid (CERN ; U. Paris-Saclay) ; Corsini, Roberto (CERN) et al.
Very high energy electron (VHEE) beams have been proposed as an alternative radiotherapy modality to megavoltage photons; they penetrate deeply without significant scattering in inhomogeneous tissue because of their high relativistic inertia. However, the depth dose distribution of a single, collimated VHEE beam is quasi-uniform, which can lead to healthy tissue being overexposed. [...]
2021 - 7 p. - Published in : Commun. Phys. 4 (2021) 33 Fulltext: PDF;

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