CERN Accelerating science

Accelerator Physics

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2019-01-15
06:22
Observation of Fast Losses in the LHC Operation in 2017 / Gorzawski, Arkadiusz (CERN ; Manchester U.) ; Appleby, Robert (Cockcroft Inst. Accel. Sci. Tech. ; U. Manchester (main)) ; Fuster-Martínez, Nuria (CERN) ; Garcia Morales, Hector (CERN) ; Redaelli, Stefano (CERN) ; Xu, Chen (CERN) ; Zamantzas, Christos (CERN)
Four diamond detectors that provide beam loss measurements with time resolution in the nanosecond range were added in the vicinity of the primary collimators of the Large Hadron Collider (LHC). This is a powerful diagnostic tool that provides the unique chance to measure bunch-by-bunch losses. [...]
2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-TUPAF029 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.TUPAF029

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2019-01-15
06:22
Special Collimation System Configuration for the LHC High-Beta Runs / Garcia Morales, Hector (Royal Holloway, U. of London) ; Bruce, Roderik (CERN) ; Burkhardt, Helmut (CERN) ; Deile, Mario (CERN) ; Jakobsen, Sune (CERN) ; Mereghetti, Alessio (CERN) ; Redaelli, Stefano (CERN)
Special LHC high-beta optics is required for the forward physics program of TOTEM and ATLAS-ALFA. In this configuration, the beam is de-squeezed (the \beta-function at the collision point is increased) in order to minimize the divergence for measurements at very small scattering angles. [...]
2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-MOPML012 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.MOPML012

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2019-01-15
06:22
New High Luminosity LHC Baseline and Performance at Ultimate Energy / Medina Medrano, Luis (Guanajuato U. ; CERN) ; Apollonio, Andrea (CERN) ; Arduini, Gianluigi (CERN) ; Brüning, Oliver (CERN) ; Giovannozzi, Massimo (CERN) ; Papadopoulou, Stefania (CERN) ; Papaphilippou, Yannis (CERN) ; Redaelli, Stefano (CERN) ; Tomás, Rogelio (CERN)
The LHC machine is envisioned to operate eventually at an ultimate beam energy of 7.5 TeV at the end of LHC Run 4, i.e. after commissioning of the HL-LHC systems, a stage falling into the High Luminosity LHC (HL-LHC) era [...]
2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-MOPML009 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.MOPML009

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2019-01-15
06:22
Experimental Interaction Region Optics for the High Energy LHC / van Riesen-Haupt, Léon (U. Oxford (main)) ; Abelleira, Jose Luis (JAI, UK ; Oxford U.) ; Crouch, Matthew (CERN) ; Cruz Alaniz, Emilia (Oxford U.) ; Seryi, Andrei (Oxford U.) ; Zhou, Demin (KEK, Tsukuba) ; Zimmermann, Frank (CERN)
The High Energy LHC (HE-LHC) is one option for a next generation hadron collider explored in the FCC-hh program. The core concept of the HE-LHC is to install FCC-hh technology magnets in the LHC tunnel. [...]
2018 - 7 p. - Published in : (2018) , pp. MOPMK006
- Published in : J. Phys. : Conf. Ser.: 1067 (2018) , no. 2, pp. 022002 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.MOPMK006

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2019-01-15
06:22
Integrated Full HE-LHC Optics and Its Performance / Hofer, Michael (Vienna U. ; CERN) ; Crouch, Matthew (CERN) ; Keintzel, Jacqueline (CERN ; Vienna U.) ; Nosochkov, Yuri (SLAC) ; Risselada, Thys (CERN) ; Tomás, Rogelio (CERN) ; Zhou, Demin (KEK, Tsukuba) ; Zimmermann, Frank (CERN) ; van Riesen-Haupt, Léon (JAI, UK)
One possible future hadron collider design investigated in the framework of the Future Circular Collider (FCC) study is the High-Energy LHC (HE-LHC). Using the 16 T dipoles developed for the FCC-hh the center of mass energy of the LHC is set to increase to 27 TeV. [...]
2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-MOPMK002 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.MOPMK002

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2019-01-15
06:22
Optics for RF Acceleration Section for the High Energy Large Hadron Collider / van Riesen-Haupt, Léon (JAI, UK) ; Abelleira, Jose Luis (JAI, UK) ; Cruz Alaniz, Emilia (JAI, UK) ; Hofer, Michael (CERN) ; Martinez Mirave, Pablo (JAI, UK) ; Seryi, Andrei (JAI, UK) ; Zhou, Demin (KEK, Tsukuba) ; Zimmermann, Frank (CERN)
As part of the FCC study, the design of the High Energy LHC (HE-LHC) is addressed. A proposed layout for the interaction region for the containing the radio frequency (RF) cavities and various beam instrumentation will be discussed. [...]
2018 - 3 p. - Published in : 10.18429/JACoW-IPAC2018-MOPMK001 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.MOPMK001

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2019-01-15
06:22
Aperture Measurements with AC Dipole at the Large Hadron Collider / Fuster-Martínez, Nuria (CERN) ; Bruce, Roderik (CERN) ; Dilly, Joschua (CERN) ; Maclean, Ewen (CERN) ; Nevay, Laurence (Royal Holloway, U. of London) ; Persson, Tobias (CERN) ; Redaelli, Stefano (CERN) ; Tomás, Rogelio (CERN)
Global aperture measurements are crucial for a safe operation and to push the performance of the LHC, in particular, the knowledge of aperture at top energy allows pushing the optics to reduce the colliding beam sizes. The standard method used in the LHC commissioning requires using several bunches for one measurement and makes bunches un-usable for other activities. [...]
2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-MOPMF048 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.MOPMF048

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2019-01-15
06:22
Transverse Coupling Measurements With High Intensity Beams Using Driven Oscillations / Persson, Tobias (CERN) ; Baud, Guillaume (CERN) ; Buffat, Xavier (CERN) ; Coello de Portugal, Jaime Maria (CERN) ; Fol, Elena (CERN) ; Fuchsberger, Kajetan (CERN) ; Gabriel, Mathieu (CERN) ; Gąsior, Marek (CERN) ; Giovannozzi, Massimo (CERN) ; Hemelsoet, Georges-Henry (CERN) et al.
Transverse coupling has been linked to instabilities and reduction in dynamic aperture and is hence a crucial parameter to control in the LHC. In this article we describe the development to use driven oscillations to measure the transverse coupling with high intensity beams. [...]
2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-MOPMF047 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.MOPMF047

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2019-01-15
06:22
Nonlinear Correction Strategies for the LHC Using Resonance Driving Terms / Carlier, Felix (CERN ; Nikhef, Amsterdam) ; Maclean, Ewen (CERN) ; Persson, Tobias (CERN) ; Tomás, Rogelio (CERN)
The correction of nonlinearities in future colliders is critical to reach operational conditions and pose a significant challenge for commissioning schemes. Several approaches have been succesfully used in the LHC to correct sextupolar and octupolar sources in the LHC insertion regions. [...]
2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-MOPMF032 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.MOPMF032

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2019-01-15
06:22
Overview of Arc Optics of FCC-hh / Chancé, Antoine (IRFU, Saclay) ; Boutin, David (IRFU, Saclay) ; Dalena, Barbara (IRFU, Saclay) ; Holzer, Bernhard (CERN) ; Schulte, Daniel (CERN)
The FCC-hh (Future Hadron-Hadron Circular Collider) is one of the options considered for the next generation accelerator in high-energy physics as recommended by the European Strategy Group. In this overview the status and the evolution of the design of optics integration of FCC-hh are described, focusing on design of the arcs, alternatives, and tuning procedures..
2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-MOPMF025 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.MOPMF025

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