CERN Accelerating science


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Suppression of Amplitude dependent closest tune approach and first tests of the ADT as an AC-dipole (MD 1412) / Persson, Tobias Hakan Bjorn (CERN) ; Gasior, Marek (CERN) ; Maclean, Ewen Hamish (CERN) ; Olexa, Jakub (CERN) ; Tomas Garcia, Rogelio (CERN) ; Valuch, Daniel (CERN) ; Wierichs, David Alexander ; Carlier, Felix Simon (Technische Universiteit Delft (NL))
The amplitude detuning has been observed to decrease significantly as the horizontal and vertical tunes are approaching each other. [...]
- 2016. - 6 p.
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Coupling Measurements and Corrections for the Combined Ramp and Squeeze / Persson, Tobias Hakan Bjorn (CERN) ; Gorzawski, Arkadiusz (Ecole Polytechnique Federale de Lausanne (CH)) ; Langner, Andy Sven (CERN) ; Malina, Lukas (University of Oslo (NO)) ; Maclean, Ewen Hamish (CERN) ; Coello De Portugal - Martinez Vazquez, Jaime Maria (Universitat Politecnica Catalunya (ES)) ; Redaelli, Stefano (CERN) ; Salvachua Ferrando, Belen Maria (CERN) ; Schaumann, Michaela (CERN) ; Solfaroli Camillocci, Matteo (CERN) et al.
In operation of the LHC the ramp and the squeeze process have been independent beam processes up to now. [...]
- 2016. - 6 p.

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Demonstration of coupling correction below the per-mil limit in the LHC / Maclean, Ewen Hamish (CERN) ; Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Fartoukh, Stephane (CERN) ; Persson, Tobias Hakan Bjorn (CERN) ; Skowronski, Piotr Krzysztof (CERN) ; Tomas Garcia, Rogelio (CERN) ; Wierichs, David Alexander
Linear coupling between betatron motion in the transverse planes is one of the key optics parameters for any accelerator. [...]
- 2016. - 7 p.

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The Right Optics Concept for the Right Dimension of the High Luminosity LHC Project / Fartoukh, Stephane (CERN)
While the LHC optics is approaching its limit in terms of beta*, not only bounded, somehow in relative, by the aperture of the existing inner triplets, but also, in absolute, by the match-ability, the flexibility and, at some point (not yet reached) the chromatic aberrations of the corresponding collision optics, the High Luminosity LHC project requests to triple or even quadruple this effort in order to meet the challenging performance target of 250 1/fb per year. This exigency, or even only half of it, cannot be satisfied without a complete change of point of view in the way low-beta* optics are thought and realized. [...]
CERN-ACC-2016-0085.- Geneva : CERN, 2017 - 17 p. - Published in : ICFA Beam Dyn.Newslett.: 71 (2017) , pp. 116-135 Fulltext: PDF;

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Linac3 LEBT beam measurements during the 2014-2015 Argon ion run / Bellodi, Giulia (CERN) ; Lombardi, Alessandra (CERN) ; Maintrot, Marc (CERN) ; Toivanen, Ville Aleksi (CERN)
Between Spring 2014 and Spring 2015, LINAC3 delivered a beam of Argon ions. [...]
- 2016. - 24 p.
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Amplitude dependent closest tune approach / Tomas Garcia, Rogelio (CERN) ; Persson, Tobias Hakan Bjorn (CERN) ; Franchi, Andrea ; Maclean, Ewen Hamish (CERN)
Recent observations in the LHC point to the existence of an amplitude dependent closest tune approach. However this dynamical behavior and its underlying mechanism remain unknown. [...]
CERN-ACC-NOTE-2016-0025.- Geneva : CERN, 2016 - 11 p. - Published in : Phys. Rev. Accel. Beams 19 (2016) 071003 APS Open Access article: PDF; Fulltext: PDF;

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Strong-Strong Simulations of β$^∗$-Levelling for Flat and Round Beams / Crouch, Matthew (Cockcroft Inst. Accel. Sci. Tech. ; Manchester U.) ; Muratori, B D (Cockcroft Inst. Accel. Sci. Tech. ; Daresbury) ; Appleby, Robert Barrie (Cockcroft Inst. Accel. Sci. Tech. ; Manchester U.)
Simulations of β$^∗$ luminosity levelling using the strongstrong beam-beam code COMBI are undertaken. Simulations for both flat and round beam profiles are discussed and analysed with respect to the coherent spectra. [...]
CERN-ACC-2015-0182.- Geneva : CERN, 2015 - 4 p. Fulltext: PDF;
In : 6th International Particle Accelerator Conference, Richmond, VA, USA, 3 - 8 May 2015, pp.TUPTY070

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Measurement of the space charge tune spread with a quadrupolar pick-up: New (general) formula VS. "Usual" one / Metral, Elias (CERN)
In 1966, W. [...]
- 2015. - 11 p.
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Fast Poisson Solvers for Self-Consistent Beam-Beam and Space-Charge Field Computation in Multiparticle Tracking Simulations / Florio, Adrien (Ecole Polytechnique Federale de Lausanne (CH)) ; Buffat, Xavier (CERN) ; Pieloni, Tatiana (CERN)
We present two different approaches to solve the 2-dimensional electrostatic problem with open boundary conditions to be used in fast tracking codes for beam-beam and space charge simulations in high energy accelerators. [...]
- 2015. - 17 p.
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Short term dynamic aperture with AC dipoles / Mönig, Saskia (CERN and Rheinische Friedrich Wilhelms Universität Bonn) ; Maclean, Ewen Hamish (CERN) ; Persson, Tobias Hakan Bjorn (CERN) ; Coello De Portugal, Jaime (CERN) ; Langner, Andy (CERN) ; Tomas, Rogelio (CERN)
The dynamic aperture of an accelerator is determined by its non-linear components and errors. [...]
- 2015.
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