CERN Accelerating science

Published Articles

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2017-10-22
06:00
First Results from Cherwell, a Monolithic Active Pixel Sensor for Particle Physics / Nooney, Tamsin (Queen Mary, U. of London (main)) ; Bevan, Adrian (Queen Mary, U. of London (main)) ; Borri, Marcello (Daresbury) ; Crooks, Jamie (Rutherford) ; Headspith, Jon (Daresbury) ; Inguglia, Gianluca (Queen Mary, U. of London (main)) ; Kolya, Scott (Bristol U.) ; Lazarus, Ian (Daresbury) ; Lemmon, Roy (Daresbury) ; Mylroie-Smith, James (Queen Mary, U. of London (main)) et al. /Arachnid
Cherwell is a CMOS Monolithic Active Pixel Sensor (MAPS) developed for digital calorimetry and charged particle tracking applications. Here, we outline the initial tests carried out to charac- terise the performance of Cherwell, give details of the test beam carried out at CERN and include the first results from this analysis [...]
2014 - 7 p. - Published in : PoS: EPS-HEP2013 (2013) , pp. 507 Fulltext: PDF; External link: POS
In : EPS-HEP 2013 European Physical Society Conference on High Energy Physics, Stockholm, Sweden, 18 - 24 Jul 2013, pp.507

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2017-10-20
07:41
Multi-messenger Observations of a Binary Neutron Star Merger /LIGO Scientific Collaboration ; Virgo Collaboration ; Fermi GBM Collaboration ; INTEGRAL Collaboration ; IceCube Collaboration ; AstroSat Cadmium Zinc Telluride Imager Team Collaboration ; IPN Collaboration ; Insight-Hxmt Collaboration ; ANTARES Collaboration ; Swift Collaboration ; AGILE Team Collaboration ; 1M2H Team Collaboration ; Dark Energy Camera GW-EM Collaboration ; DES Collaboration ; DLT40 Collaboration ; GRAWITA Collaboration ; Fermi Large Area Telescope Collaboration ; ATCA Collaboration ; ASKAP Collaboration ; Las Cumbres Observatory Group Collaboration ; OzGrav Collaboration ; DWF (Deeper Wider Faster Program) Collaboration ; AST3 Collaboration ; CAASTRO Collaborations Collaboration ; VINROUGE Collaboration ; MASTER Collaboration ; J-GEM Collaboration ; GROWTH Collaboration ; JAGWAR Collaboration ; CaltechNRAO Collaboration ; TTU-NRAO Collaboration ; NuSTAR Collaboration ; Pan-STARRS Collaboration ; MAXI Team Collaboration ; TZAC Consortium Collaboration ; KU Collaboration ; Nordic Optical Telescope Collaboration ; ePESSTO Collaboration ; GROND Collaboration ; Texas Tech University Collaboration ; SALT Group Collaboration ; TOROS Collaboration ; BOOTES Collaboration ; MWA Collaboration ; CALET Collaboration ; IKI-GW Follow-up Collaboration ; H.E.S.S. Collaboration ; LOFAR Collaboration ; LWA Collaboration ; HAWC Collaboration ; Pierre Auger Collaboration ; ALMA Collaboration ; Euro VLBI Team Collaboration ; Pi of Sky Collaboration ; Chandra Team at McGill University Collaboration ; DFN Collaboration ; ATLAS Collaboration ; High Time Resolution Universe Survey Collaboration ; RIMAS Collaboration ; RATIR Collaboration ; SKA South Africa/MeerKAT Collaboration
On 2017 August 17 a binary neutron star coalescence candidate (later designated GW170817) with merger time 12:41:04 UTC was observed through gravitational waves by the Advanced LIGO and Advanced Virgo detectors. The Fermi Gamma-ray Burst Monitor independently detected a gamma-ray burst (GRB 170817A) with a time delay of $\sim$1.7 s with respect to the merger time [...]
LIGO-P1700294; arXiv:1710.05833.- 2017-10-16 - Published in : Astrophys. J. 848 (2017) L12 Preprint: PDF;

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2017-10-18
06:37
Characterization of Shielding for the CERN-SPS Vacuum Flanges With Respect to Beam Coupling Impedance / Kaltenbacher, Thomas (CERN) ; Vollinger, Christine (CERN)
Longitudinal multi-bunch instabilities in the CERN-SPS pose a serious limitation for future beam intensities required for high luminosity LHC. Hence, an impedance model for the SPS accelerator was developed from which one group of vacuum flanges could be identified as being a major culprit for these instabilities. [...]
2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-WEPIK090 Fulltext: PDF;

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2017-10-18
06:37
Status of the FCC-hh Collimation System / Molson, James (Orsay, LAL) ; Bruce, Roderik (CERN) ; Faus-Golfe, Angeles (Orsay, LAL) ; Fiascaris, Maria (CERN) ; Krainer, Alexander (CERN) ; Redaelli, Stefano (CERN)
The future circular hadron collider (FCC-hh) will have an unprecedented proton beam energy of 50 TeV, and total stored beam energy of 8.4 GJ. We discuss current developments in the collimation system design, and methods with which the challenges faced due to the high energies involved can be mitigated. [...]
2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-MOPAB001 Fulltext: PDF;

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2017-10-18
06:37
Electron Cloud Effects at the LHC and LHC Injectors / Rumolo, Giovanni (CERN) ; Bartosik, Hannes (CERN) ; Belli, Eleonora (Rome U. ; CERN) ; Dijkstal, Philipp (CERN ; Darmstadt, Tech. U.) ; Iadarola, Giovanni (CERN) ; Li, Kevin (CERN) ; Mether, Lotta (CERN) ; Romano, Annalisa (CERN) ; Schenk, Michael (Ecole Polytechnique, Lausanne ; CERN) ; Zimmermann, Frank (CERN)
Electron cloud effects are one of the main limitations of the performance of the LHC and its injectors. Enormous progress has been done in the simulation of the electron cloud build-up and of the effects on beam stability while mitigation measures have been identified and implemented (scrubbing, low secondary electron yield coatings, etc.). [...]
2017 - 7 p. - Published in : 10.18429/JACoW-IPAC2017-MOZA1 Fulltext: PDF;

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2017-10-18
06:37
Ultimate Field Gradient in Metallic Structures / Wuensch, Walter (CERN)
Significant progress has been made over the past decade by studies of normal-conducting linear colliders, NLC/JLC (Next/Japanese Linear Collider) and CLIC (Compact Linear Collider), to raise achievable accelerating gradient from the range of 20-30 MV/m up to 100-120 MV/m. The gain has come through a greatly increased understanding of high-power rf phenomena, development of quantitative high-gradient rf design methods, refinements in cavity fabrication techniques and through development of high peak rf power sources. [...]
2017 - 6 p. - Published in : 10.18429/JACoW-IPAC2017-MOYCA1 Fulltext: PDF;

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2017-10-18
06:37
Approaching the Nominal Performance at the LHC / Wenninger, Jorg (CERN)
In 2015 the Large Hadron Collider (LHC) restarted for Run 2 after an almost two year long shutdown to consolidate the machine for operation at nominal beam energy. Following a month of recommissioning and training of the magnet system, the LHC operated for the first time at an energy of 6.5 TeV. [...]
2017 - 6 p. - Published in : 10.18429/JACoW-IPAC2017-MOYAA1 Fulltext: PDF;

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2017-10-18
06:37
Automatic Local Aperture Measurements in the SPS / Kain, Verena (CERN) ; Bartosik, Hannes (CERN) ; Cettour Cave, Stephane (CERN) ; Cornelis, Karel (CERN) ; Velotti, Francesco (CERN)
The CERN SPS (Super Proton Synchrotron) serves as LHC injector and provides beam for the North Area fixed target experiments. It is equipped with flat vacuum chambers to accommodate the large horizontal beam size required during transition crossing and slow extraction. [...]
2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-THPAB147 Fulltext: PDF;

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2017-10-18
06:37
New Features of the 2017 SixTrack Release / Sjobak, Kyrre (CERN) ; Barranco García, Javier (CERN) ; De Maria, Riccardo (CERN) ; Fitterer, Miriam (Fermilab) ; Gupta, Vikas (IISER, Kolkata) ; McIntosh, Eric (CERN) ; Mereghetti, Alessio (CERN) ; Molson, James (Orsay, LAL)
The SixTrack particle tracking code is routinely used to simulate particle trajectories in high energy circular machines like the LHC and FCC, and is deployed for massive simulation campaigns on CERN clusters and on the BOINC platform within the LHC@Home volunteering computing project. The 2017 release brings many upgrades that improve flexibility, performance, and accuracy. [...]
2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-THPAB047 Fulltext: PDF;

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2017-10-18
06:37
Online Bunch by Bunch Transverse Instability Detection in LHC / Söderén, Martin (CERN) ; Kotzian, Gerd (CERN) ; Ojeda Sandonís, Miguel (CERN) ; Valuch, Daniel (CERN)
Reliable detection of developing transverse instabilities in the Large Hadron Collider is one of the main operational challenges of the LHC's high intensity proton run. A full machine snapshot provided from the moment of instability is a crucial input to develop and fine tune instability models. [...]
2017 - 3 p. - Published in : 10.18429/JACoW-IPAC2017-MOPAB117 Fulltext: PDF;

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