CERN Accelerating science

CERN Published Articles

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2016-08-22
12:11
Probing Anomalous WW γ and WWZ Couplings with Polarized Electron Beam at the LHeC and FCC-Ep Collider / Turk Cakir, I ((Istanbul Aydin University)) ; Senol, A (Kastamonu University) ; Tasci, A T (Kastamonu University) ; Cakir, O (Istanbul Aydin University)
We study the anomalous WWγ and WWZ couplings by calculating total cross sections of two processes at the LHeC with electron beam energy Ee=140 GeV and the proton beam energy Ep=7 TeV, and at the FCC-ep collider with the polarized electron beam energy Ee=80 GeV and the proton beam energy Ep=50 TeV. At the LHeC with electron beam polarization, we obtain the results for the difference of upper and lower bounds as (0.975, 0.118) and (0.285, 0.009) for the anomalous (∆κγ, λγ) and (∆κz, λz) couplings, respectively. [...]
CERN-ACC-2016-0107.- Geneva : CERN, 2016 - Published in : : 9 (2015) , no. 1 Access to fulltext document: PDF;

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2016-08-12
06:33
Data Analysis and System Survey Framework for the LHC Beam Loss Monitoring System / Xu, Chen (CERN) ; Dehning, Bernd (CERN) ; Zamantzas, Christos (CERN)
A data analysis framework has been developed to perform systematic queries and automatic analysis of the large amount of data produced by the LHC beam loss monitoring system. The framework is used to provide continuous system supervision and can give advance warning of any potential system failures. [...]
2016 - 4 p. - Published in : 10.18429/JACoW-IPAC2016-THPOY046 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.THPOY046

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2016-08-12
06:33
Commissioning of the Machine Protection Systems of the Large Hadron Collider Following its First Long Shutdown / Wollmann, Daniel (CERN) ; Schmidt, Ruediger (CERN) ; Uythoven, Jan (CERN) ; Wenninger, Jorg (CERN) ; Zerlauth, Markus (CERN)
During the first long shutdown of the Large Hadron Collider (LHC) extending for more than 18 months, most Machine Protection Systems (MPS) have undergone significant changes, and upgrades. A full re-commissioning of the MPS was performed at the end of the shutdown and during the LHC beam commissioning in 2015. [...]
2016 - 4 p. - Published in : 10.18429/JACoW-IPAC2016-THPOY045 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.THPOY045

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2016-08-12
06:33
Experimental Setup to Measure the Damage Limits of Superconducting Magnets due to Beam Impact at CERN's HiRadMat Facility / Kleiven, David (CERN) ; Auchmann, Bernhard (CERN) ; Raginel, Vivien (CERN) ; Schmidt, Ruediger (CERN) ; Verweij, Arjan (CERN) ; Wollmann, Daniel (CERN)
The future upgrade of CERN's injector chain for the Large Hadron Collider (LHC) will lead to an increase of the beam brightness in the LHC. Beam absorbers are capturing missteered beams, but some limited beam impact on superconducting magnets can hardly be avoided. [...]
2016 - 3 p. - Published in : 10.18429/JACoW-IPAC2016-THPOY044 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.THPOY044

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2016-08-12
06:33
Time Scale of Crab Cavity Failures Relevant for High Luminosity LHC / Sjobak, Kyrre (CERN) ; Bruce, Roderik (CERN) ; Burkhardt, Helmut (CERN) ; Kwee-Hinzmann, Regina (Royal Holloway, U. of London) ; Macpherson, Alick (CERN) ; Santamaría García, Andrea (Ecole Polytechnique, Lausanne ; CERN)
A good knowledge of the effects of the crab cavities, required for the baseline High Luminosity LHC (HL-LHC), is needed before the results of the first tests of crab cavity prototypes in the SPS, planned for 2018, will be available. In case of crab cavity failures, we have to make sure that time scales are long enough so that the beams can be cleanly dumped before damage by beam loss occurs. [...]
2016 - 4 p. - Published in : 10.18429/JACoW-IPAC2016-THPOY043 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.THPOY043

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2016-08-12
06:33
Evolution and Perspectives of Second Generation Magnet Interlock Systems at CERN / Romera, Iván (CERN) ; Bastian, Yan (CERN) ; Csendes, Geza (CERN) ; Dahlen, Pierre (CERN) ; Mompo, Richard (CERN) ; Von Siebenthal, Christophe (CERN) ; Zerlauth, Markus (CERN)
The CERN accelerator complex relies on thousands of superconducting and normal conducting magnets to guide the particle beams on their trajectories throughout the accelerator chain. In order to protect magnet and powering equipment from damage, complex magnet interlock systems are deployed and operated in the LHC and its injectors. [...]
2016 - 4 p. - Published in : 10.18429/JACoW-IPAC2016-THPOY042 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.THPOY042

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2016-08-12
06:33
CERN Beam Interlock Redundant Dump Trigger Module Performance during LHC Run 2 / Calcoen, Daniel (CERN) ; Gabourin, Stéphane (CERN) ; Siemko, Andrzej (CERN)
During the Long Shutdown 1 an additional link between the Beam Interlocks System and the LHC Beam Dumping System was installed. This third channel is a direct access from the BIS to the asynchronous dump triggering lines. [...]
2016 - 3 p. - Published in : 10.18429/JACoW-IPAC2016-THPOY041 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.THPOY041

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2016-08-12
06:33
Dependability Studies for CERN PS Booster RF System Upgrade / Rey Orozko, Odei (CERN) ; Apollonio, Andrea (CERN) ; Jonker, Michael (CERN) ; Paoluzzi, Mauro (CERN)
Radio frequency systems are a vital part of almost all accelerators. The request for a higher beam bright-ness from the injector chain of CERN's Large Hardon Collider, as demanded by the future High-Luminosity program, has motivated, among many other upgrades, the construction of new RF equipment in the PS Boost-er. [...]
2016 - 4 p. - Published in : 10.18429/JACoW-IPAC2016-THPOY030 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.THPOY030

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2016-08-12
06:33
Design of Beam Optics for the FCC-ee Collider Ring / Oide, Katsunobu (KEK, Tsukuba) ; Aiba, Masamitsu (PSI, Villigen) ; Aumon, Sandra (CERN) ; Benedikt, Michael (CERN) ; Blondel, Alain (Geneva U.) ; Bogomyagkov, Anton (Novosibirsk, IYF) ; Boscolo, Manuela (LNF, Dafne Light) ; Burkhardt, Helmut (CERN) ; Cai, Yunhai (SLAC) ; Doblhammer, Andreas (CERN) et al.
A design of beam optics will be presented for the FCC-ee double-ring collider. The main characteristics are 45 to 175 GeV beam energy, 100 km circumference with two IPs/ring, 30 mrad crossing angle at the IP, crab-waist scheme with local chromaticity correction system, and "tapering" of the magnets along with the local beam energy. [...]
2016 - 3 p. - Published in : 10.18429/JACoW-IPAC2016-THPOR022 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.THPOR022

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2016-08-12
06:33
Tolerance Studies and Dispersion Free Steering for Extreme Low Emittance in the FCC-ee Project / Aumon, Sandra (CERN) ; Doblhammer, Andreas (TU Vienna) ; Härer, Bastian (KIT, Karlsruhe, IPE) ; Holzer, Bernhard (CERN) ; Oide, Katsunobu (KEK, Tsukuba)
The FCC-ee study is investigating the design of a 100 km e⁺/e⁻ circular collider for precision measurements and rare decay observations in the range of 90 to 350 GeV center of mass energy with luminosities in the order of 10³⁵ cm⁻²s⁻¹. In order to reach such performances, an extreme focusing of the beam is required in the interaction regions with a low vertical beta function of 2 mm at the IP. [...]
2016 - 4 p. - Published in : 10.18429/JACoW-IPAC2016-THPOR001 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.THPOR001

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