CERN Accelerating science

Accelerator Physics

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2020-12-16
17:28
LHC MD 4505: Forced 3D beam oscillations / Malina, Lukas (CERN) ; Tomas Garcia, Rogelio (CERN) ; Timko, Helga (CERN) ; Louro Alves, Diogo Miguel (CERN) ; Coello De Portugal - Martinez Vazquez, Jaime Maria
This note summarises the detailed programme of an MD testing the new chromaticity and fast optics measurement methods. [...]
CERN-ACC-NOTE-2020-0065.
- 2020. - 14 p.
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2020-12-16
06:02
Loss of transverse Landau damping by noise and wakefield driven diffusion / Furuseth, Sondre Vik (EPFL-ISIC, Lausanne ; CERN) ; Buffat, Xavier (CERN)
Landau damping of coherent modes is strongly dependent on the exact shape of the particle bunches. One often assumes that the transverse distributions in high-energy hadron colliders can be approximated by Gaussian distributions, in acceptable agreement with measurements, but known to be only a first approximation. [...]
2020 - 20 p. - Published in : Phys. Rev. Accel. Beams 23 (2020) 114401 Fulltext: PDF;

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2020-11-28
06:26
Electron flux and pressure dynamic in the LHC vacuum pilot sector as a function of beam parameters and beam pipe properties / Buratin, Elena (CERN ; EPFL, Lausanne, FSL) ; Baglin, Vincent (CERN) ; Henrist, Bernard (CERN) ; Chiggiato, Paolo (CERN) ; Fasoli, Ambrogio (EPFL, Lausanne, FSL)
The Large Hadron Collider (LHC) is affected by the electron cloud (EC) phenomenon that can provoke beam instabilities, detrimental heat loads and pressure increases in the vacuum system. An innovative dedicated system called vacuum pilot sector (VPS) provides a continuous monitoring of the electron flux and of the pressure signals thanks to electron pickup and vacuum gauges. [...]
2020 - 10 p. - Published in : Phys. Rev. Accel. Beams 23 (2020) 114802 Fulltext from Publisher: PDF;

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2020-11-24
12:09
Bunch characteristics evolution for lepton and hadron rings under the influence of the Intra-beam scattering effect / Papadopoulou, Parthena Stefania
The physical parameter quantifying particle events’ production and thereby the performance of a collider is the luminosity [...]
CERN-THESIS-2019-405 - 123 p.

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2020-11-24
11:33
Strategy for Landau damping of head-tail instabilities at top energy in the HL-LHC / Buffat, Xavier (CERN) ; Antipov, Sergey ; Arduini, Gianluigi (CERN) ; De Maria, Riccardo (CERN) ; Karastathis, Nikos ; Kostoglou, Sofia (CERN) ; Koval, Adam (University of Dundee (GB)) ; Maclean, Ewen Hamish (CERN) ; Mounet, Nicolas (CERN) ; Papaphilippou, Yannis (CERN) et al.
The main aspects linked to Landau damping of head-tail instabilities at top energy in the HL-LHC are discussed, in particular the interplay between the arc octupoles and long-range, offset or head-on beam-beam interactions as well as lattice imperfections. [...]
CERN-ACC-NOTE-2020-0059.
- 2020. - 28 p.
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2020-11-17
04:21
Modeling and simulation of transverse wakefields in PWFA / Chen, J.B.B. (CERN ; Oslo U.) ; Schulte, D. (CERN) ; Adli, E. (Oslo U.)
A simplified model describing the PWFA (plasma wakefield acceleration) transverse instability in the form of a wake function parameterized only with an effective cavity aperture radius $a$ is benchmarked against PIC-simulations. This wake function implies a $1/a^4$ scaling of the transverse wakefields, which indicates transverse intra-beam wakefields typically several orders of magnitude higher than in conventional acceleration structures. [...]
arXiv:1912.09035.- 2020-09-19 - 9 p. - Published in : J. Phys. : Conf. Ser. 1596 (2020) 012057 Fulltext: PDF;
In : 4th European Advanced Accelerator Concepts Workshop, La Biodola, Isola d'Elba, Italy, 15 - 21 Sep 2019, pp.012057

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2020-11-11
06:42
Detection of faulty beam position monitors using unsupervised learning / Fol, E (CERN ; Frankfurt U.) ; Tomás, R (CERN) ; Coello de Portugal, J (PSI, Villigen) ; Franchetti, G (Frankfurt U. ; Darmstadt, GSI)
Optics measurements at the LHC are mainly based on turn-by-turn signal from hundreds of beam position monitors (BPMs). Faulty BPMs produce erroneous signal causing unreliable computation of optics functions. [...]
2020 - 10 p. - Published in : Phys. Rev. Accel. Beams 23 (2020) 102805 Fulltext from Publisher: PDF;

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2020-11-11
06:42
Preload Characterization of Short Models of MQXF the Nb$_3$Sn Low-$β$ Quadrupole for the Hi-Lumi LHC / Takala, Eelis (CERN) ; Ambrosio, Giorgio (Fermilab) ; Bourcey, Nicolas (CERN) ; Cheng, Daniel W (LBL, Berkeley) ; Ferracin, Paolo (CERN) ; Guinchard, Michael (CERN) ; Izquierdo Bermudez, Susana (CERN) ; Mangiarotti, Franco (CERN) ; Pan, Heng (LBL, Berkeley) ; Perez, Juan Carlos (CERN) et al.
MQXF is the Nb$_3$Sn Low-β Quadrupole magnet that the HL-LHC project is planning to install in the LHC interaction regions in 2026 as part of an upgrade to increase the LHC inte-grated luminosity by about a factor of ten. The magnet will be fab-ricated in two different lengths: 4.2 m for MQXFA, built in the US by the Accelerator Upgrade Project (AUP), and 7.15 m for MQXFB, fabricated by CERN. [...]
FERMILAB-PUB-20-119-TD.- 2020 - 6 p. - Published in : IEEE Trans. Appl. Supercond. 30 (2020) 4002806 Fulltext: PDF; External link: Fermilab Accepted Manuscript

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2020-11-11
05:03
Numerical Analysis of the Screening Current-Induced Magnetic Field in the HTS Insert Dipole Magnet Feather-M2.1-2 / Bortot, Lorenzo (CERN ; Darmstadt, Tech. U.) ; Mentink, Matthias (CERN) ; Petrone, Carlo (CERN) ; Van Nugteren, Jeroen (CERN) ; Kirby, Glyn (CERN) ; Pentella, Mariano (CERN ; Polytech. Turin) ; Verweij, Arjan (CERN) ; Schöps, Sebastian (Darmstadt, Tech. U.)
Screening currents are field-induced dynamic phenomena which occur in superconducting materials, leading to persistent magnetization. Such currents are of importance in ReBCO tapes, where the large size of the superconducting filaments gives rise to strong magnetization phenomena. [...]
arXiv:2005.09467.- 2020-10-30 - 14 p. - Published in : Supercond. Sci. Technol. 33 (2020) 125008 Fulltext: PDF; Fulltext from publisher: PDF;

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2020-11-10
11:33
Optics for CERENKOV counters CEDAR-W : Technical specification for polishing of the quartz elements / Bovet, C ; Wilson, R
LabII-EA-Spec-75-14 ; CERN-LabII-EA-Spec-75-14.
- 1975. - 6 p.
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