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All CERN Accelerators documents

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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
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
Angular asymmetry of the nuclear interaction probability of high energy particles in short bent crystals / Scandale, W (CERN) ; Cerutti, F (CERN) ; Esposito, L S (CERN) ; Garattini, M (CERN ; Imperial Coll., London) ; Gilardoni, S (CERN) ; Natochii, A (CERN ; Orsay, LAL ; Taras Shevchenko U.) ; Rossi, R (CERN) ; Smirnov, G I (CERN ; Dubna, JINR) ; Zhovkovska, V (CERN ; Taras Shevchenko U.) ; Galluccio, F (INFN, Naples ; Naples U.) et al.
The rate of inelastic nuclear interactions in a short bent silicon crystal was precisely measured for the first time using a 180 GeV/c positive hadron beam produced in the North Experimental Area of the CERN SPS. An angular asymmetry dependence on the crystal orientation in the vicinity of the planar channeling minimum has been observed. [...]
2020 - 5 p. - Published in : Eur. Phys. J. C 80 (2020) 27

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2020-01-25
05:17
Method for computing driving and detuning beam coupling impedances of an asymmetric cavity using eigenmode simulations / Arsenyev, S. (CERN) ; Salvant, B. (CERN)
We propose a method for numerical calculation of driving and detuning transverse beam coupling impedances of an asymmetric cavity. The method relies on eigenmode simulations and can be viewed as an alternative to time domain wakefield simulations. [...]
arXiv:1904.04680.- 2019-12-20 - 8 p. - Published in : Phys. Rev. Accel. Beams 22 (2019) 121002 Fulltext: PDF;

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2020-01-24
06:18
Future Circular Colliders / Benedikt, M (CERN) ; Blondel, A (CERN) ; Janot, P (CERN) ; Klein, M (Liverpool U.) ; Mangano, M (CERN) ; McCullough, M (CERN) ; Mertens, V (CERN) ; Oide, K (CERN) ; Riegler, W (CERN) ; Schulte, D (CERN) et al.
After 10 years of physics at the Large Hadron Collider (LHC), the particle physics landscape has greatly evolved. Today, a staged Future Circular Collider (FCC), consisting of a luminosity-frontier highest-energy electron–positron collider (FCC-ee) followed by an energy-frontier hadron collider (FCC-hh), promises the most far-reaching physics program for the post-LHC era. [...]
2019 - 29 p. - Published in : Ann. Rev. Nucl. Part. Sci. 69 (2019) 389-415

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2020-01-24
06:18
A Magnetic Measurement Model for Real-Time Control of Synchrotrons / Grech, Christian ; Buzio, Marco ; Sammut, Nicholas
In this paper, we present a measurement model for estimating the magnetic field of a synchrotron-type particle accelerator, based on sensors installed in a reference magnet. The model combines the calibration of the individual sensors with the experimental characterization of the magnets to infer, in absolute terms, the value of the average field in the ring, as needed for the real-time feedback control of the accelerator. [...]
2019 - 8 p. - Published in : IEEE Trans. Instrum. Meas. 69 (2019) 393-400 Fulltext: PDF;

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2020-01-23
17:31
MD 3584: Long-Range Beam-Beam 2018 / Karastathis, Nikos ; Fartoukh, Stephane (CERN) ; Kostoglou, Sofia (National Technical Univ. of Athens (GR)) ; Papaphilippou, Yannis (CERN) ; Pojer, Mirko (CERN) ; Poyet, Axel (Universite Grenoble-Alpes (FR)) ; Solfaroli Camillocci, Matteo (CERN) ; Sterbini, Guido (CERN)
A recurrent issue of the LHC operation, observed both during Run1 and Run2 is the asymmetric behaviour of the two beams in terms of particle losses. [...]
CERN-ACC-NOTE-2020-0011. - 2020. - 29 p.
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