CERN Accelerating science

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2019-01-18
08:14
Highlights from the Compact Muon Solenoid (CMS) Experiment / Ghosh, Saranya Samik /CMS Collaboration
The highlights of the recent activities and physics results leading up to the summer of 2018 from the Compact Muon Solenoid (CMS) experiment at the CERN Large Hadron Collider (LHC) are presented here. The CMS experiment has a very wide-ranging physics program, and only a very limited subset of the physics analyses being performed at CMS are discussed here, consisting of several important results from the analysis of proton-proton collision data at center-of-mass energy of 13 TeV. [...]
arXiv:1901.05340.- 2019-01-16 - Published in : Universe 5 (2019) 28 Fulltext: PDF;

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2019-01-16
06:31
802 MHz ERL Cavity Design and Development / Marhauser, F (Jefferson Lab) ; Castagnola, S (Jefferson Lab) ; Clemens, W A (Jefferson Lab) ; Dail, J G (Jefferson Lab) ; Dhakal, P (Jefferson Lab) ; Fors, F (Jefferson Lab) ; Henry, J (Jefferson Lab) ; Rimmer, R A (Jefferson Lab) ; Turlington, L (Jefferson Lab) ; Williams, R S (Jefferson Lab) et al.
In the framework of a collaboration between CERN and JLab, an SRF accelerating cavity for energy recovery linacs operating at 802 MHz was developed in the context of the CERN's Large Hadron electron Collider (LHeC) design study. A single-cell and a five-cell cavity from fine grain high RRR niobium were built at JLab to validate the basic RF design in vertical tests. [...]
- Published in : 10.18429/JACoW-IPAC2018-THPAL146 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.THPAL146

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2019-01-15
06:22
Dynamic Testing and Characterization of Advanced Materials in a New Experiment at CERN HiRadMat Facility / Bertarelli, Alessandro (CERN) ; Accettura, Carlotta (CERN ; Milan Polytechnic) ; Berthomé, Emmanuel (CERN) ; Bianchi, Laura (CERN) ; Bolz, Philipp (Darmstadt, GSI) ; Carra, Federico (CERN) ; Fichera, Claudio (CERN) ; Frankl, Matthias (CERN) ; Furness, Thomas (Huddersfield U.) ; Gobbi, Giorgia (CERN) et al.
An innovative and comprehensive experiment (named “Multimat”) was successfully carried out at CERN HiRadMat facility on 18 different materials relevant for Collimators and Beam Intercepting Devices. Material samples, tested under high intensity proton pulses of 440 GeV/c, exceeding the energy density expected in HL-LHC, ranged from very light carbon foams to tungsten heavy alloys, including novel composites as graphite/carbides and metal/diamond without and with thin-film coatings. [...]
2018 - 8 p. - Published in : (2018) , pp. WEPMF071
- Published in : J. Phys. : Conf. Ser.: 1067 (2018) , no. 8, pp. 082021 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.WEPMF071

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2019-01-15
06:22
Electron Cloud Build Up for LHC Sawtooth Vacuum Chamber / Guillermo Cantón, Gerardo (CERN ; CINVESTAV, IPN) ; Maury Cuna, Georfrey (Guanajuato U.) ; Ocampo, Edgar (Guanajuato U.) ; Zimmermann, Frank (CERN)
At high proton-beam energies, beam-induced synchrotron radiation is an important source of heating, of beam-related vacuum pressure increase, and of primary photoelectrons, which can give rise to an electron cloud. For the arcs of LHC a sawtooth pattern had been imprinted on the horizontally outward side  of the vacuum chamber in order to locally absorb synchrotron radiation photons without dispersing them all around the chamber. [...]
2018 - 3 p. - Published in : 10.18429/JACoW-IPAC2018-TUPAF030 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.TUPAF030

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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
Challenges and Status of Tuning Simulations for CLIC Traditional Beam Delivery System / Bodenstein, Ryan (JAI, UK) ; Burrows, Philip (JAI, UK) ; Marín, Eduardo (CERN)
The beam delivery system (BDS) for the 3 TeV version of the Compact Linear Collider (CLIC) has two main design types. One type is referred to as the local scheme, as it is approximately one kilometer shorter and corrects the chromaticity in both planes. [...]
2018 - 3 p. - Published in : 10.18429/JACoW-IPAC2018-MOPML010 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.MOPML010

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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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