CERN Accelerating science

CERN Published Articles

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2017-07-27
14:23
Sloan Digital Sky Survey IV: Mapping the Milky Way, Nearby Galaxies and the Distant Universe / Blanton, Michael R. (Stanford U., Phys. Dept.) ; Bershady, Matthew A. (Wisconsin U., Madison, Astron.) ; Abolfathi, Bela ; Albareti, Franco D. (Madrid, Autonoma U. ; Madrid, IFT) ; Allende Prieto, Carlos ; Almeida, Andres ; Alonso-García, Javier ; Anders, Friedrich (Potsdam, Astrophys. Inst.) ; Anderson, Scott F. (LLNL, Livermore) ; Andrews, Brett et al.
We describe the Sloan Digital Sky Survey IV (SDSS-IV), a project encompassing three major spectroscopic programs. The Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2) is observing hundreds of thousands of Milky Way stars at high resolution and high signal-to-noise ratio in the near-infrared. [...]
arXiv:1703.00052.- 2017-02-28 - Published in : Astron. J. 154 (2017) 28 Fulltext: PDF;

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2017-07-27
06:48
The beam lines design for the CERN neutrino platform in the CERN north area and an outlook on their expected performance / Charitonidis, N (CERN) ; Brugger, M (CERN) ; Efthymiopoulos, I (CERN) ; Gatignon, L (CERN) ; Karyotakis, Y (Annecy, LAPP) ; Sala, P R (CERN ; INFN, Italy) ; Nowak, E (CERN ; AGH-UST, Cracow) ; Ortega-Ruiz, I (CERN ; Ecole Polytechnique, Lausanne)
In the framework of the CERN Neutrino Platform project, extensions to the existing SPS North Area secondary beam lines “H2” and “H4”, able to provide low-energy charged particles in the momentum range from 0.4 to 12 GeV/c, have been designed. The parameters of these “very low energy” beam lines, the expected beam composition as seen by the experiments as well as an outlook on their expected performance are summarized in this paper. [...]
2017 - 6 p. - Published in : J. Phys. : Conf. Ser. 874 (2017) 012056

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2017-07-27
06:48
Upgrade of the two-screen measurement setup in the AWAKE experiment / Turner, Marlene (CERN ; Graz, Tech. U.) ; Clerc, Vincent (CERN) ; Gorgisyan, Ishkhan (CERN) ; Gschwendtner, Edda (CERN) ; Mazzoni, Stefano (CERN) ; Petrenko, Alexey (CERN)
The AWAKE project at CERN uses a self-modulated 400 GeV/c proton bunch to drive GV/m wakefields in a 10 m long plasma with an electron density of $n_{pe}$ = 7 × $10^{14}$ electrons/$cm^3$. We present the upgrade of a proton beam diagnostic to indirectly prove that the bunch self-modulated by imaging defocused protons with two screens downstream the end of the plasma. [...]
2017 - 5 p. - Published in : J. Phys. : Conf. Ser. 874 (2017) 012031

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2017-07-27
06:48
Possible limits of plasma linear colliders / Zimmermann, F (CERN)
Plasma linear colliders have been proposed as next or next-next generation energy-frontier machines for high-energy physics. I investigate possible fundamental limits on energy and luminosity of such type of colliders, considering acceleration, multiple scattering off plasma ions, intrabeam scattering, bremsstrahlung, and betatron radiation. [...]
2017 - 8 p. - Published in : J. Phys. : Conf. Ser. 874 (2017) 012030

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2017-07-27
06:48
Conceptual design of a pre-booster ring for $FCC e^+ e^-$ injector / Etisken, O (Ankara U.) ; Papaphilippou, Y (CERN) ; Ciftci, A K (Izmir U. Economics, Izmir)
The $FCC e^+ e^-$ injector complex needs to produce and to transport a high-intensity $e^+/e^-$ beam at a fast repetition rate of about 0.1 Hz for topping up the collider at its collision energy. A basic parameter set exists for all the collider energies, assuming a 10 GeV linac operating with a large number of bunches being accumulated in the existing SPS, which serves as pre-accelerator and damping ring before the bunches are transferred to the high-energy booster. [...]
2017 - 7 p. - Published in : J. Phys. : Conf. Ser. 874 (2017) 012014

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2017-07-27
06:48
Experimental validation of the Achromatic Telescopic Squeezing (ATS) scheme at the LHC / Fartoukh, S (CERN) ; Bruce, R (CERN) ; Carlier, F (CERN) ; De Portugal, J Coello (CERN) ; Garcia-Tabares, A (CERN) ; Maclean, E (CERN) ; Malina, L (CERN) ; Mereghetti, A (CERN) ; Mirarchi, D (CERN) ; Persson, T (CERN) et al.
The Achromatic Telescopic Squeezing scheme offers new techniques to deliver unprecedentedly small beam spot size at the interaction points of the ATLAS and CMS experiments of the LHC, while perfectly controlling the chromatic properties of the corresponding optics (linear and non-linear chromaticities, off-momentum beta-beating, spurious dispersion induced by the crossing bumps). The first series of beam tests with ATS optics were achieved during the LHC Run I (2011/2012) for a first validation of the basics of the scheme at small intensity. [...]
2017 - 7 p. - Published in : J. Phys. : Conf. Ser. 874 (2017) 012010

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2017-07-27
06:48
Modelling and measurements of bunch profiles at the LHC / Papadopoulou, S (CERN ; Crete U.) ; Antoniou, F (CERN ; Liverpool U.) ; Argyropoulos, T (CERN) ; Fitterer, M (Fermilab) ; Hostettler, M (CERN) ; Papaphilippou, Y (CERN)
The bunch profiles in the LHC are often observed to be non-Gaussian, both at Flat Bottom (FB) and Flat Top (FT) energies. Especially at FT, an evolution of the tail population in time is observed. [...]
FERMILAB-CONF-17-155-AD.- 2017 - 6 p. - Published in : J. Phys. : Conf. Ser. 874 (2017) 012008

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2017-07-27
06:48
Multiparametric response of the LHC Dynamic Aperture in presence of beam-beam effects / Pellegrini, D (CERN) ; Antoniou, F (CERN) ; Fartoukh, S (CERN) ; Iadarola, G (CERN) ; Papaphilippou, Y (CERN)
We performed extended simulations of LHC dynamic aperture (DA) in the presence of beam-beam effects in the weak-strong approximation, evaluating the contributions of parameters such as: tunes, optics, bunch intensity, crossing angle, emittance, chromaticity and current in the Landau octupoles. Here we present a summary of these studies, giving an overview of the amplitude of the LHC operational space and pointing out the remaining margins for mitigation of instabilities. [...]
2017 - 6 p. - Published in : J. Phys. : Conf. Ser. 874 (2017) 012006

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2017-07-27
06:48
Assessment of thermal loads in the CERN SPS crab cavities cryomodule$^1$ / Carra, F (CERN) ; Apeland, J (CERN) ; Calaga, R (CERN) ; Capatina, O (CERN) ; Capelli, T (CERN) ; Verdú-Andrés, S (RIKEN BNL) ; Zanoni, C (CERN)
As a part of the HL-LHC upgrade, a cryomodule is designed to host two crab cavities for a first test with protons in the SPS machine. The evaluation of the cryomodule heat loads is essential to dimension the cryogenic infrastructure of the system. [...]
2017 - 7 p. - Published in : J. Phys. : Conf. Ser. 874 (2017) 012005

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2017-07-27
06:48
Synchrotron radiation backgrounds for the FCC-hh experiments / Collamati, F (INFN, Rome) ; Boscolo, M (INFN, Italy) ; Burkhardt, H (CERN) ; Kersevan, R (CERN)
In this paper we present a detailed analysis of the Synchrotron Radiation emitted by the 50 TeV protons of the FCC-hh in the last bending and quadrupole magnets upstream of the interaction region. We discuss the characteristics of this radiation in terms of power, flux, photon spectrum and fans with and without crossing angle for comparison. [...]
2017 - 6 p. - Published in : J. Phys. : Conf. Ser. 874 (2017) 012004

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