CERN Accelerating science

Published Articles

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2014-04-22
14:36
An OpenMP Parallelisation of Real-time Processing of CERN LHC Beam Position Monitor Data / Renshall, H (CERN) ; Deniau, L (CERN)
SUSSIX is a FORTRAN program for the post processing of turn-by-turn Beam Position Monitor (BPM) data, which computes the frequency, amplitude, and phase of tunes and resonant lines to a high degree of precision. For analysis of LHC BPM data a specific version run through a C steering code has been implemented in the CERN Control Centre to run on a server under the Linux operating system but became a real time computational bottleneck preventing truly online study of the BPM data. [...]
2012 Published version from JACoW: PDF;
In : 11th International Computational Accelerator Physics Conference, Rostock-Warnemünde, Germany, 19 - 24 Aug 2012, pp.THP06

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2014-04-22
14:30
Simulation of Multibunch Instabilities with the HEADTAIL Code / Mounet, N (Ecole Polytechnique, Lausanne ; CERN) ; Metral, E (CERN) ; Rumolo, G (CERN)
Multibunch instabilities due to beam-coupling impedance can be a critical limitation for synchrotrons operating with many bunches. To study these instabilities, the HEADTAIL code has been extended to simulate the motion of many bunches under the action of wake fields. [...]
2012 Published version from JACoW: PDF;
In : 11th International Computational Accelerator Physics Conference, Rostock-Warnemünde, Germany, 19 - 24 Aug 2012, pp.THSDI2

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2014-04-22
13:44
Automatic Computer Algorithms for Beam-based Setup of the LHC Collimators / Valentino, G (CERN ; Malta U.) ; (CERN ; U. Malta) ; Assmann, R W (CERN) ; Bruce, R (CERN) ; Redaelli, S (CERN) ; Salvachua, B (CERN) ; Wollmann, D (CERN)
Beam-based setup of the LHC collimators is necessary to establish the beam centers and beam sizes at the collimator locations and determine the operational settings during various stages of the LHC machine cycle..
2012 Fulltext: PDF;
In : 11th International Computational Accelerator Physics Conference, Rostock-Warnemünde, Germany, 19 - 24 Aug 2012, pp.MOSBI1

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2014-04-21
10:21
Pseudo Hermitian interactions in the Dirac Equation / Panella, Orlando ; Roy, Pinaki
We consider $(2+1)$ dimensional massless Dirac equation in the presence of complex vector potentials. It is shown that such vector potentials (leading to complex magnetic fields) can produce bound states and the Dirac Hamiltonians are $\eta$-pseudo Hermitian. [...]
arXiv:1404.4746.- 2014 - 8 p. - Published in : Symmetry 6 (2014) 103-110 External link: Preprint

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2014-04-21
10:21
A real-time thermal field theoretical analysis of Kubo-type shear viscosity : Numerical understanding with simple examples / Ghosh, Sabyasachi
A real-time thermal field theoretical calculation of shear viscosity has been described in the Kubo formalism for bosonic and fermionic medium. The two point function of viscous stress tensor in the lowest order provides one-loop skeleton diagram of boson or fermion field for bosonic or fermionic matter. [...]
arXiv:1404.4788.- 2014 - Published in : Int. J. Mod. Phys. A 29 (2014) 1450054 External link: Preprint

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2014-04-21
04:21
Near-Infrared Detection and Characterization of the Exoplanet HD 95086 b with the Gemini Planet Imager / Galicher, Raphael ; Rameau, Julien ; Bonnefoy, Mickael ; Baudino, Jean-Loup ; Currie, Thayne ; Boccaletti, Anthony ; Chauvin, Gael ; Lagrange, Anne-Marie ; Marois, Christian
HD 95086 is an intermediate-mass debris-disk-bearing star. VLT/NaCo $3.8 \mu m$ observations revealed it hosts a $5\pm2 \mathrm{M}_{Jup}$ companion (HD 95086 b) at $\simeq 56$ AU. [...]
arXiv:1404.4635.- 2014 - 4 p. External link: Preprint

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2014-04-18
04:34
Optimising a Muon Spectrometer for Measurements at the ISIS Pulsed Muon Source / Giblin, S R ; Cottrell, S P ; King, P J C ; Tomlinson, S ; Jago, S J S ; Randall, L J ; Roberts, M J ; Norris, J ; Howarth, S ; Mutamba, Q B et al.
This work describes the development of a state-of-the-art muon spectrometer for the ISIS pulsed muon source. Conceived as a major upgrade of the highly successful EMU instrument, emphasis has been placed on making effective use of the enhanced flux now available at the ISIS source. [...]
arXiv:1404.4542.- 2014 - Published in : Pages (2014) External link: Preprint

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2014-04-18
04:33
The Single-Channel Regime of Transport through Random Media / Peña, A ; Girschik, A ; Libisch, F ; Rotter, S ; Chabanov, A A
The propagation of light through samples with random inhomogeneities can be described by way of transmission eigenchannels, which connect incoming and outgoing external propagating modes. Although the detailed structure of a disordered sample can generally not be fully specified, these transmission eigenchannels can nonetheless be successfully controlled and utilized for focusing and imaging light through random media. [...]
arXiv:1404.4180.- 2014 - Published in : Nat. Comm. 5 (2014) 3488 External link: Preprint

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2014-04-18
04:33
Proton capture by 14N at astrophysical energies / Grineviciute, J ; Halderson, Dean
Calculations are reported for low energy, proton capture by 14N with the recoil corrected continuum shell model. An interaction from a fit to Cohen and Kurath (6-16) p-shell matrix elements and Reid soft core g-matrix elements is employed. [...]
arXiv:1404.4624.- 2014 - Published in : Nucl. Part. Phys.: 35 (2008) , pp. 055201 External link: Preprint

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2014-04-18
04:33
Dirac oscillators and the relativistic R matrix / Grineviciute, J ; Halderson, Dean
The Dirac oscillators are shown to be an excellent expansion basis for solutions of the Dirac equation by $R$-matrix techniques. The combination of the Dirac oscillator and the $R$-matrix approach provides a convenient formalism for reactions as well as bound state problems. [...]
arXiv:1404.4621.- 2014 - Published in : Phys. Rev. C 80 (2009) 044607 External link: Preprint

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