CERN Accelerating science

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2020-01-25
10:34
Self Powered Neutron Detectors with High Energy Sensitivity / Fiore, S (ENEA, Frascati) ; Aberle, O (CERN) ; Angelone, M (ENEA, Frascati) ; Calviani, M (CERN) ; Giambattista, F Di (ENEA, Frascati ; Rome U., Tor Vergata) ; Lepore, L (ENEA, Frascati) ; Nyman, M (Geel, JRC) ; Pillon, M (ENEA, Frascati) ; Plompen, A (Geel, JRC)
2020 - 5 p. - Published in : EPJ Web Conf. 225 (2020) 02001

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2020-01-25
10:34
Sub-micron scale transverse electron beam size diagnostics methodology based on the analysis of optical transition radiation source distribution / Aryshev, A (KEK, Tsukuba) ; Ainsworth, R (Royal Holloway, U. of London) ; Aumeyr, T (Royal Holloway, U. of London) ; Bergamaschi, M (Royal Holloway, U. of London) ; Boogert, S T (Royal Holloway, U. of London) ; Karataev, P (Royal Holloway, U. of London) ; Kieffer, R (CERN) ; Kruchinin, K (Royal Holloway, U. of London) ; Lefevre, T (CERN) ; Mazzoni, S (CERN) et al.
Optical Transition Radiation (OTR) appearing when a charged particle crosses a boundary between two media with different dielectric properties has widely been used as a tool for transverse profile measurements of charged particle beams in numerous facilities worldwide. The resolution of the conventional monitors is defined by the dimensions of the Point Spread Function (PSF) distribution, i.e. [...]
2020 - 18 p. - Published in : JINST 15 (2020) P01020 Fulltext: PDF;

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2020-01-25
10:34
Role of surface microgeometries on electron escape probability and secondary electron yield of metal surfaces / Bajek, D (U. Dundee) ; Wackerow, S (U. Dundee) ; Zanin, D A (CERN) ; Baudin, L (CERN) ; Bogdanowicz, K (CERN) ; Valdivieso, E Garcia-Tabares (CERN) ; Calatroni, S (CERN) ; Di Girolamo, B (CERN) ; Sitko, M (CERN) ; Himmerlich, M (CERN) et al.
The influence of microgeometries on the Secondary Electron Yield (SEY) of surfaces is investigated. Laser written structures of different aspect ratio (height to width) on a copper surface tuned the SEY of the surface and reduced its value to less than unity. [...]
2020 - 8 p. - Published in : Sci. Rep. 10 (2020) 250 Fulltext: PDF;

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2020-01-25
10:34
Impact of flux jumps in future colliders / Coello de Portugal, J (CERN) ; Tomás, R (CERN) ; Fiscarelli, L (CERN) ; Gamba, D (CERN) ; Martino, M (CERN)
Type-II superconductors, like the Nb3Sn used in the new HL–LHC quadrupole triplet and 11 T dipoles or FCC dipoles, are known to show an unstable behavior during magnetic-field ramps. This paper presents an analysis of the possible effects on the beam dynamics of this behavior of the magnets, with a focus on emittance blow-up..
2020 - 9 p. - Published in : Phys. Rev. Accel. Beams 23 (2020) 011001 Fulltext: PDF;

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2020-01-25
10:34
Source of horizontal instability at the CERN Proton Synchrotron Booster / Koukovini-Platia, E (CERN) ; Barnes, M J (CERN) ; Bartosik, H (CERN) ; Rumolo, G (CERN) ; Sermeus, L (CERN) ; Zannini, C (CERN)
The CERN Proton Synchrotron Booster (PSB) has been known to suffer from horizontal instabilities since its early operation in the 1970s. These instabilities appear at specific beam energies and range of working points. [...]
2020 - 16 p. - Published in : Phys. Rev. Accel. Beams 22 (2020) 124201 Fulltext: PDF;

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2020-01-25
10:34
Breakdown localisation in a pulsed DC electrode system / Profatilova, Iaroslava (CERN) ; Stragier, Xavier (CERN ; Eindhoven, Tech. U.) ; Calatroni, Sergio (CERN) ; Kandratsyeu, Aleh (Lisbon, CFTP) ; Rodriguez Castro, Enrique (CERN) ; Wuensch, Walter (CERN)
Breakdown localisation is an important diagnostic for studies of vacuum arcs in high electromagnetic field systems such as DC electrodes and radio frequency (RF) accelerating structures. For example, determining the position of individual breakdowns and corresponding distributions of ensembles of breakdowns are important measurements in high-gradient X-band test stands (CERN, SLAC, KEK) where these measurements are made by monitoring the RF signals.A highly precise breakdown localisation technique has been developed for the CLIC (Compact LInear Collider) pulsed DC electrode systems. [...]
2020 - 9 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 953 (2020) 163079 Fulltext: PDF;

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2020-01-25
10:34
Beam parameters optimisation at CLIC for the threshold scan of the process $e^+e^-\rightarrow \widetilde{\mu}_{R}^{+}\widetilde{\mu}_{R}^{-}\rightarrow \mu ^+ \mu^-\widetilde{\chi}_{1}^{0}\widetilde{\chi}_{1}^{0}$ at multi-TeV energies / Andrianala, F (iHEP-MAD ; CERN) ; Roloff, P (CERN) ; Schulte, D (CERN)
CLIC offers the ability to measure various proprieties of potential new heavy states with high precision. Beam-beam effects that inevitably occur at the interaction point affect the precision of physics measurements. [...]
2020 - 10 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 955 (2020) 163327

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2020-01-25
10:34
Resonance ionization schemes for high resolution and high efficiency studies of exotic nuclei at the CRIS experiment / Koszorús, Á (Leuven U.) ; Billowes, J (Manchester U.) ; Binnersley, C L (Manchester U.) ; Bissell, M L (Manchester U.) ; Cocolios, T E (Leuven U.) ; Cooper, B S (Manchester U.) ; de Groote, R P (Leuven U. ; Jyvaskyla U.) ; Farooq-Smith, G J (Leuven U.) ; Fedosseev, V N (CERN) ; Flanagan, K T (Manchester U.) et al.
This paper presents an overview of recent resonance ionization schemes used at the Collinear Resonance Ionization Spectroscopy (CRIS) setup located at ISOLDE, CERN. The developments needed to reach high spectral resolution and efficiency will be discussed. [...]
2020 - 5 p. - Published in : Nucl. Instrum. Methods Phys. Res., B 463 (2020) 398-402
In : 18th International Conference on Electromagnetic Isotope Separators and Related Topics, Geneva, Switzerland, 16 - 21 Sep 2018, pp.398-402

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2020-01-25
10:34
Radiation imaging with glass Micromegas / Brunbauer, F M (CERN) ; Desforge, D (IRFU, Saclay) ; Ferrer-Ribas, E (IRFU, Saclay) ; Iguaz, F J (IRFU, Saclay) ; Mehl, B (CERN) ; De Oliveira, R (CERN) ; Oliveri, E (CERN) ; Papaevangelou, T (IRFU, Saclay) ; Pizzirusso, O (CERN) ; Pollacco, E C (IRFU, Saclay) et al.
Optically recording scintillation light emitted by MicroPattern Gaseous Detectors (MPGDs) with imaging sensors is a versatile and performant readout modality taking advantage of modern high granularity imaging sensors. To allow scintillation light readout of a detector based on MicroMesh Gaseous Structure (Micromegas) technology, we have integrated a Micromegas on a glass substrate with a transparent anode. [...]
2020 - 6 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 955 (2020) 163320

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2020-01-25
10:34
Why do we flush gas in gaseous detectors? / Procureur, S (IRFU, Saclay) ; Attié, D (IRFU, Saclay) ; Bouteille, S (Unlisted, FR) ; Calvet, D (IRFU, Saclay) ; Coppolani, X (IRFU, Saclay) ; Gallois, B (IRFU, Saclay) ; Gomez, H (IRFU, Saclay) ; Kebbiri, M (IRFU, Saclay) ; Le Courric, E (IRFU, Saclay) ; Magnier, P (IRFU, Saclay) et al.
The effects and the origin of the gas degradation in a gaseous detector-based tracker are investigated. The study focused on the so-called T2K gas, which turned out to be highly sensitive to pollutants. [...]
2020 - 7 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 955 (2020) 163290

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