CERN Accelerating science

Published Articles

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2019-10-15
06:34
High-z proton and kaon multiplicity ratios on deuteron target in SIDIS / Stolarski, Marcin (LIP, Lisbon) /Compass
Recently COMPASS has reported unexpected results concerning K$^{-}$ over K$^+$ multiplicity ratio for kaons produced in DIS with a large fraction of the virtual-photon energy, PLB 786 (2018) 390. The obtained ratio is significantly below the lower limit given by NLO pQCD.In order to provide more information about the observed phenomenon we show for the first time results concerning $\bar{\rm p}$ over p multiplicity ratio for protons produced in DIS with a large fraction of the virtual-photon energy. [...]
SISSA, 2019 - 6 p. - Published in : PoS DIS2019 (2019) 207 Fulltext: PDF;
In : The XXVII International Workshop on Deep Inelastic Scattering and Related Subjects, Turin, Italy, 8 - 12 Apr 2019, pp.207

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2019-10-15
06:34
Measurements of inclusive neutral diboson production with ATLAS / Geng, Cong (Michigan U.) /ATLAS
We present recent measurements of $ZZ$ and $Z\gamma$ production in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS experiment at LHC. The unfolded differential cross section for $ZZ\to 4\ell$ as a function of the four-lepton invariant mass is presented and compared to state-of-the-art Standard Model calculations. [...]
SISSA, 2019 - 6 p. - Published in : PoS DIS2019 (2019) 286 Fulltext: PDF;
In : The XXVII International Workshop on Deep Inelastic Scattering and Related Subjects, Turin, Italy, 8 - 12 Apr 2019, pp.286

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2019-10-15
06:34
Spatially resolved dark current in high gradient traveling wave structures / Paszkiewicz, Jan (CERN ; JAI, UK ; Oxford U.) ; Burrows, Philip (JAI, UK ; Oxford U. ; CERN) ; Wuensch, Walter (CERN)
High-gradient accelerating structures are known to produce field-emitted current from regions of high surface field, which are captured and accelerated by the fields within the structure. This current is routinely measured in structures under test in the CLIC (Compact Linear Collider) high-gradient test stands using Faraday cups. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPRB062 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPRB062

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2019-10-15
06:34
Dark current analysis at CERN’s X-band facility / Banon Caballero, David (Valencia U., IFIC ; CERN) ; Boronat, Marça (Valencia U., IFIC ; CERN) ; Catalán Lasheras, Nuria (CERN) ; Faus-Golfe, Angeles (Orsay, LAL) ; Gimeno, Benito (Valencia U., IFIC) ; Lucas, Thomas (Melbourne U. ; CERN) ; Millar, William (Lancaster U. ; CERN) ; Paszkiewicz, Jan (U. Oxford (main) ; CERN) ; Pitman, Sam (CERN) ; Sánchez, Victoria (Valencia U., IFIC ; CERN) et al.
Dark current is particularly relevant during operation in high-gradient linear accelerators. Resulting from the capture of field emitted electrons, dark current produces additional radiation that needs to be accounted for in experiments. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPRB059 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPRB059

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2019-10-15
06:34
Wakefield suppression in the main linac of the klystron-based first stage of CLIC at 380 GeV / Liu, Jiayang (Tsinghua U., Beijing, Dept. Eng. Phys. ; Tsinghua U., Beijing, KLPRI) ; Chen, Huaibi (Tsinghua U., Beijing, Dept. Eng. Phys. ; Tsinghua U., Beijing, KLPRI) ; Grudiev, Alexej (CERN) ; Shi, Jiaru (Tsinghua U., Beijing, Dept. Eng. Phys. ; Tsinghua U., Beijing, KLPRI) ; Zha, Hao (Tsinghua U., Beijing, Dept. Eng. Phys. ; Tsinghua U., Beijing, KLPRI)
An alternative klystron-based scenario for the first stage of Compact Linear Collider (CLIC) at 380 GeV centre-of-mass energy was proposed. To preserve the beam stability and luminosity of CLIC, the beam-induced transverse long-range wakefield in main linac must be suppressed to an acceptable value. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPRB043 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPRB043

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2019-10-15
06:34
Flat-bottom instabilities in the CERN SPS / Schwarz, Markus (CERN) ; Iliakis, Konstantinos (CERN) ; Lasheen, Alexandre (CERN) ; Papotti, Giulia (CERN) ; Repond, Joël (CERN) ; Shaposhnikova, Elena (CERN) ; Timko, Helga (CERN)
At intensities of $2.6 \times 10^{11}$ protons per bunch (ppb), required at SPS injection for the High Luminosity LHC beam, longitudinal instabilities can degrade the beam quality delivered by the SPS, the LHC injector at CERN. In this paper, we concentrate on beam instability at flat bottom. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPTS049 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPTS049

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2019-10-15
06:34
Electron beam dynamics simulation for electron lenses / Sadovich, Sergey (CERN) ; Rossi, Adriana (CERN) ; Stancari, Giulio (Fermilab)
A test stand is under construction at CERN to study high perveance electron guns, electron beam dynamics, and electron beam diagnostics for electron lenses. It will be used to test electron guns for the Hollow Electron Lenses under consideration for beam halo control for High Luminosity LHC (CERN), and for the Space Charge Compensation at SIS18 (GSI) in the frame of the EU funded ARIES project. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPTS048 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPTS048

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2019-10-15
06:34
Space charge driven resonances in the CERN PS / Asvesta, Foteini (CERN ; Natl. Tech. U., Athens) ; Bartosik, Hannes (CERN) ; Huschauer, Alexander (CERN) ; Papaphilippou, Yannis (CERN)
In the CERN Proton Synchrotron space charge driven resonances are excited around the operational working point due to the periodicity of the optics functions. In this paper, the resonances are studied using analytical methods, i.e. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPTS047 Preprint: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPTS047

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2019-10-15
06:34
Detailed characterisation of the LEIR intensity limitations for a Pb ion beam / Saá Hernández, Angela (CERN) ; Bartosik, Hannes (CERN) ; Biancacci, Nicolo (CERN) ; Hirlaender, Simon (CERN) ; Moreno, Daniel (CERN) ; Zampetakis, Michail (CERN)
The equilibrium emittance of the Pb beam in the CERN Low Energy Ion Ring (LEIR) results from the interplay of electron cooling and heating processes, as intra-beam scattering and space charge. In this paper we present the measurements of the emittance evolution as a function of intensity, working point and resonance excitation, and compare them with the simulations of the heating processes. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPTS042 Preprint: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPTS042

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2019-10-15
06:34
Energy dependence of the reproducibility and injection efficiency of the LINAC3-LEIR complex / Hirlaender, Simon (CERN) ; Bartosik, Hannes (CERN) ; Bellodi, Giulia (CERN) ; Biancacci, Nicolo (CERN) ; Kain, Verena (CERN) ; Saá Hernández, Angela (CERN) ; Scrivens, Richard (CERN)
High intensities in the CERN Low Energy Ion Ring (LEIR) are achieved by stacking several multi-turn injections from the pre-accelerator LINAC3. Up to seven consecutive 200 μs long, 200 ms spaced pulses are injected from LINAC3 into LEIR. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPTS040 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPTS040

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