CERN Accelerating science

All CERN Accelerators documents

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I/Q Model of the SPS 200 MHz Travelling Wave Cavity and Feedforward Design / Baudrenghien, Philippe (CERN) ; Mastoridis, Themistoklis (California Polytechnic State Univ. (US))
As part of the LHC injector upgrade project (LIU), that calls for the doubling of the bunch intensity injected from the SPS into the LHC, the SPS Low Level RF (LLRF) is fully upgraded during the LHC Long-Shutdown 2 (LS2) [...]
- 2020. - 22 p.
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New IPPOG Website Design and Development, Technical Specification / Bruant Gulejova, Barbora (University of Bern, Switzerland; IPPOG Coordination Team)
The content of this document have been used as a Technical Specification for CERN Price Enquiry DO-31960/EP_UAT during the tendering process in February 2019 in order to award the purchase order for the design and implementation of the new IPPOG website to the professional web design company. The scope of this document goes beyond its purpose as a Technical Specification for bidding purposes: it serves as an active IPPOG record and it contains exhaustive information about the IPPOG collaboration and recommendations on how to develop the new IPPOG website including the new resource database having IPPOG’s future vision in mind [...]
IPPOG-PUB-002.- Geneva : CERN, 2019 Fulltext: PDF;

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A linear Framework for Orbit Correction in the High-Luminosity Large Hadron Collider / Andersson, Joel Daniel (Lund University (SE))
In a circular accelerator the closed orbit can be viewed as the mean position of particles in a beam. The closed orbit is perturbed by machine errors and can be manipulated by dedicated corrector magnets. [...]
CERN-THESIS-2019-349.- 113 p. Fulltext: PDF; External link: Approve this document (restricted)

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Groomed jet substructure measurements of charm jets tagged with $\rm{D}^{0}$ mesons in pp collisions at $\sqrt{s}$ = 13 TeV /ALICE Collaboration
The ALICE collaboration at the CERN LHC reports the first measurements of groomed jet substructure observables for jets containing a fully reconstructed $\rm{D}^{0}$ in pp collisions at $\sqrt{s}$ = 13 TeV. Iterative declustering techniques access the jet splitting tree of track-based jets, with grooming techniques isolating the perturbative branches. [...]
ALICE-PUBLIC-2020-002.- Geneva : CERN, 2020 - 14. Fulltext: PDF;

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Global electroweak fit in the FCC-ee era / Erler, J (Mexico U. ; U. Mainz, PRISMA) ; Schott, M (U. Mainz, PRISMA)
The top quark and Higgs boson masses have been predicted before their respective discoveries by the global fit of the Standard Model to electroweak precision data. With the Higgs boson discovery and the measurement of its mass, the last missing parameter of the Standard Model has been fixed and thus the internal consistency of the Standard Model can be probed at a new level by comparing direct measurements with the indirect predictions of the global electroweak fit. [...]
2020 - 3 p. - Published in : 10.23731/CYRM-2020-003.217 Fulltext: PDF; External link: CERN e-publishing
In : Theory for the FCC-ee, pp.217-219

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RF multipoles deliverable / Cruz Alaniz, Emilia (University of Liverpool (GB)) ; Papaphilippou, Yannis (CERN) ; Welsch, Carsten Peter (University of Liverpool (GB))
The crab cavities to be installed in the High-Luminosity LHC (HL-LHC) aim to provide an increase in luminosity by restoring head-on collisions and therefore reducing the loss of luminosity due to the crossing angle. [...]
- 2020. - 17 p.

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Summary of the 2019 ICAF, LIU & ARIES Space Charge Workshop at CERN / Schmidt, Frank (CERN) ; Papaphilippou, Yannis (CERN)
Following the success of the previous Space Charge Workshop at CERN in 2013, in Oxford in 2015 and in Darmstadt in 2017, CERN has hosted the 4th workshop in this series from the 4th - 6th November 2019, and it has been held under the auspices of ICFA, LIU and ARIES [...]
- 2020. - 8 p.
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Experimental Study of Wakefields Driven by a Self-Modulating Proton Bunch in Plasma / Turner, M. ; Muggli, P.
We study experimentally the longitudinal and transverse wakefields driven by a highly relativistic proton bunch during self-modulation in plasma. [...]

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A Mathematica Notebook for the calculation of the anomalous skin effect in copper / Calatroni, Sergio (CERN)
This Mathematica Notebook allows calculating the RF surface impedance of copper, in the normal and anomalous skin effect regimes, for any value of frequency, temperature and magnetic field (thus including magnetoresistance effects). [...]
- 2020. - 11 p.
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Toward inertial sensing with a 2$^{3}$S positronium beam / Mariazzi, Sebastiano (Trento U. ; TIFPA-INFN, Trento) ; Caravita, Ruggero (TIFPA-INFN, Trento ; CERN) ; Doser, Michael (CERN) ; Nebbia, Giancarlo (INFN, Padua) ; Brusa, Roberto S (TIFPA-INFN, Trento ; Trento U.)
In this work, we discuss the possibility of inertial sensing with positronium in the 2$^{3}$S metastable state for the measurement of optical dipole, relativistic and gravitational forces on a purely leptonic matter-antimatter system. Starting from the characteristics of an available 2$^{3}$S beam, we estimate the time necessary to measure accelerations ranging from ~10$^{5}$ m/s$^{2}$ to 9.1 m/s$^{2}$ with two different inertial sensitive devices: a classical moiré deflectometer and a Mach–Zehnder interferometer. [...]
2020 - 9 p. - Published in : Eur. Phys. J. D 74 (2020) 79

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