121 Works

CERN Yellow Reports: Monographs, Vol 2 (2020): SPS Beam Dump Facility: Comprehensive Design Study

Editors: M. Calviani, B. Goddard, R. Jacobsson and M. Lamont The proposed Beam Dump Facility (BDF) is foreseen to be located in the North Area of the Super Proton Synchrotron (SPS). It is designed to be able to serve both beam-dump-like and fixed-target experiments. The SPS and the new facility would offer unique possibilities to enter a new era of exploration at the intensity frontier. Possible options include searches for very weakly interacting particles predicted...

Collection of notes from ATLAS and CMS

Addendum to the report on the Physics at the HL-LHC, and perspectives for the HE-LHC. This addendum collects the original notes from the ATLAS and CMS Collaborations, used as input to the "Workshop on the Physics of HL-LHC, and Perspectives at HE-LHC", which took place between October 2017 and December 2018 at CERN.

αQED, eff (s) for precision physics at the FCC-ee/ILC

F. Jegerlehner
Discovering the ‘physics behind precision’ at future linear or circular colliders (ILC or FCC projects) requires improved SM predictions based on more precise input parameters. I will review the role of αQED, eff at future collider energies and report on possible progress based on results from low-energy machines.

e+e− → γγ at large angles for FCC-ee luminometry

C.M. Carloni, M. Chiesa, G. Montagna, O. Nicrosini & F. Piccinini
We examine large-angle two-photon production in e+e− annihilation as a possible process to monitor the luminosity of the FCC-ee. We review the current status of the theoretical pre- dictions and perform an exploratory phenomenological study of the next-to-leading and higher- order QED corrections using the Monte Carlo event generator BabaYaga@NLO. We also con- sider the one-loop weak corrections, which are necessary to meet the high-precision requirements of the FCC-ee. Possible ways to approach the target...

Perspectives of heavy quarkonium production at the FCC-ee

Z.-G. He & B.A. Kniehl
We review heavy quarkonium production, concentrating on the J/ψ case, by these two processes in Sections 8.1 and 8.2, respectively, and discuss the prospects of heavy quarkonium production at the FCC-ee beyond the current measurements made at B factories and CERN LEP-II. Section 8.3 contains a summary and an outlook.

NNLO corrections in four dimensions

R. Pittau
Currently, four-dimensional techniques applied to higher-order calculations are under active investigation. The main motivation for this is the need to simplify perturbative calculations necessary to cope with the precision requirements of the future LHC and FCC experiments. In this contribution, I review the four-dimensional regularisation or renormalization (FDR) approach to the computation of NNLO corrections in four dimensions. In particular, I describe how fully inclusive NNLO final-state quark-pair corrections are computed in FDR by directly...

Executive summary

S. Damjanović & H. Schopper
No abstract.

Components of the SEE-LS

Ch. Benabderrahmane, G. Le Bec, J. Chavanne & D. Einfeld
No abstract.

Magnets of the storage ring

Ch. Benabderrahmane, G. Le Bec, J. Chavanne & D. Einfeld
No abstract.

Girder system

J.-C. Biasci & D. Einfeld
No abstract.

CERN Yellow Reports: Monographs, Vol. 8 (2020): A primary electron beam facility at CERN—eSPS: Conceptual design report

Editors: Torsten Åkesson and Steinar Stapnes The design of a primary electron beam facility at CERN is described. The study has been carried out within the framework of the wider Physics Beyond Colliders study. It re-enables the Super Proton Synchrotron (SPS) as an electron accelerator, and leverages the development invested in Compact Linear Collider (CLIC) technology for its injector and as an accelerator research and development infrastructure. The facility would be relevant for several of...

CERN Yellow Reports: Monographs, Vol 7 (2019): Physics of the HL-LHC, and Perspectives at the HE-LHC

Editors: A. Dainese, M. Mangano, A. B. Meyer A. Nisati, G. Salam and M. Vesterinen This report comprises the outcome of five working groups that have studied the physics potential of the high-luminosity phase of the LHC (HL-LHC) and the perspectives for a possible future high-energy LHC (HE-LHC). The working groups covered a broad range of topics: Standard Model measurements, studies of the properties of the Higgs boson, searches for phenomena beyond the Standard Model,...

RF systems

R. Calaga, P. Baudrenghien, O. Capatina, E. Jensen & E. Montesinos
The HL-LHC beams are injected, accelerated, and stored to their nominal energy of 7 TeV by the existing 400 MHz superconducting RF system of the LHC. A novel superconducting RF system consisting of eight cavities per beam for transverse deflection (aka crab cavities) of the bunches will be used to compensate the geometric loss in luminosity due to the non-zero crossing angle and the extreme focusing of the bunches in the HL-LHC. Due to doubling...

IT string and hardware commissioning

M. Bajko & M. Pojer
The HL-LHC IT string (IT string) is a test stand for the HL-LHC, whose goal is to validate the collective behaviour of the IT magnets and circuits in conditions as near as possible to the operational ones. Each individual magnet circuit will be powered through a SC link and its associated current leads up to the ultimate operational current while cooled to 1.9 K in liquid helium. The test stand will be installed in the...


I. Dawson
This report documents the knowledge and experiences gained by the LHC experiments in running vertex and tracker detector systems in extreme radiation environments and concludes a series of workshops held at CERN. By the time of the workshops, the last one held on February 2019, the LHC machine had delivered a large fraction of the design luminosity to the experiments and the deleterious effects of radiation on detector performance and operation were being observed and...

HL - LHC acronyms

The Editorial Team
No abstract.

Controls technologies

J. Serrano
By the time of the commissioning and subsequent operation of the HL-LHC, many of the physical elements of the control system will have been upgraded due to obsolescence. This applies particularly to the front and back end CPUs and storage. It is not, however, foreseen that the overall control system strategy and architecture will change in its conceptual structure during this period, and many parts of the current controls infrastructure will still be sufficient for...

Measurements of radiation damage on silicon sensors

J.L. Agram, W. Barter, M. Baselga, M. Battaglia, J. Beyer, H.M. Borecka-Bielska, D. Brzhechko, P. Collins, A. De Cosa, I. Dawson, F. Djama, F. Feindt, A. Grummer, M. Hoeferkamp, J. Hunt, T. Kondo, V. Lima, A. Macchiolo, J. Llorente Merino, K. Mochizuki, B. Nachman, G. Sarpis, S. Seidel, J. Sonneveld, S. Tsuno … & R. Wang
This chapter is organized as follows. Section 5.1 introduces, for each experiment, aspects of the detector set-up and measurement methods particularly relevant for the measurements. Next, the models used to interpret the data are summarized in Section 5.2. Then, in Section 5.3, we present the measurements for the above observables. The chapter ends with discussion and outlook in Section 5.4.

FCC tau polarisation

S. Banerjee & Z. Was
No abstract.

Machine protection

D. Wollmann, R. Denz, B. Lindström, E. Ravaioli, F. Rodríguez Mateos, A. Siemko, J. Uythoven, A. Verweij, A. Will & M. Zerlauth
Since the previous TDR version 0.1, the hardware development has made significant progress. The universal quench detection system, CLIQ and energy extraction system prototypes have been successfully produced and tested and first units have been successfully deployed and used in SM18. This progress is reflected in the Sections below and some of the previously retained options have therefore been removed. In addition, the development of the quench heater power supplies for the HL-LHC is well...

CERN Yellow Reports: Monographs, Vol. 1 (2021): Radiation effects in the LHC experiments: Impact on detector performance and operation

Editor: I. Dawson This report documents the knowledge and experiences gained by the LHC experiments in running detector systems in radiation environments during 2010–2018, with a focus on the inner detector systems. During this time, the LHC machine has delivered a large fraction of the design luminosity to the experiments and the deleterious effects of radiation on detector operation are being observed and measured. It is timely to review the findings from across the experiments....

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