122 Works

Impact of radiation on electronics and opto-electronics

M. Backhaus, M. Bindi, P. Butti, E. Butz, E. Chabert, S. Chen, J. Dickinson, W. Erdmann, J. Garcia Pascual, R. Gerosa, B. Haney, H. Hillemanns, K. Lantzsch, A. La Rosa, K. Padeken, F. Pinto, G. Pownall, D. Robinson, A. Rozanov, J. Troska & T. Weidberg
In this chapter we will present the results of the impact of radiation on electronics and opto-electronics for two of the LHC experiments during Run 1 and Run 2. ATLAS results are presented in Section 6.1; CMS in Section 6.2. In Section 6.3 we will present a comparison between the two experiments, highlighting operational guidelines and proposing solutions to build the electronics and opto-electronics of the future LHC experiments.

Simulating radiation effects and signal response in silicon sensors

M. Benoit, M. Bomben, E. Chabert, T. Lari, J. Llorente Merino, B. Nachman, L. Rossini, P. Sabatini, J. Sonneveld, C. Suarez, M. Swartz, T. Szumlak & A. Wang
Simulating the effects of radiation on signal response in silicon sensors is crucial for accurately predicting detector performance throughout the lifetime of the experiment. This, in turn, improves the reconstruction accuracy of proton–proton collisions and helps maintain the experiment’s physics reach. In what follows, the strategies implemented by the LHC experiments to correctly simulate the evolution of silicon tracking performance with luminosity will be presented. Different implementations of sensor simulations are used by the large...

CERN Yellow Reports: Monographs, Vol 1 (2017): Feasibility Study for BioLEIR

Edited by G. Ghithan, R. Ghislain, S. Schuh CERN-2017-001-M, ISBN (Print)978–92–9083–440–3, ISBN (PDF) 978–92–9083–441–0

Chapter 1: Standard Model Processes

M. L. Mangano Et Al.
This chapter documents the production rates and typical distributions for a number of benchmark Standard Model processes, and discusses new dynamical phenomena arising at the highest energies available at this collider. We discuss the intrinsic physics interest in the measurement of these Standard Model processes, as well as their role as backgrounds for New Physics searches.

CERN Yellow Reports: Monographs, Vol 3 (2018): The CLIC potential for new physics

Corresponding editors: J. de Blas, R. Franceschini, F. Riva, P. Roloff, U. Schnoor, M. Spannowsky, J. D. Wells, A. Wulzer and J. Zupan Abstract: The Compact Linear Collider (CLIC) is a mature option for the future of high energy physics. It combines the benefits of the clean environment of e+e− colliders with operation at high centre-of-mass energies, allowing to probe scales beyond the reach of the Large Hadron Collider (LHC) for many scenarios of new...

CERN Yellow Reports: Monographs, Vol 4 (2019): Study on the career trajectories of people with a working experience at CERN

This document describes the results of a study, aiming to measure the impact of CERN and of its environment on the career of people who worked at the laboratory. The data was collected using two on-line question- naires, launched in 2016 and 2017, targeting experimentalists and theorists, respectively. The mandate, the methodology followed, the questionnaires and the analysis of the data collected are presented.

Preface

A. Dainese, M. Mangano, A. B. Meyer, A. Nisati, G. Salam & M. Vesterinen
The preface presents the motivation for making the report, the mandate of the five working groups and the corresponding conveners.

Executive summary

No abstract.

Introduction and overview

A. Blondel, J. Gluza, S. Jadach, P. Janot & T. Riemann
This report includes a collection of studies devoted to a discussion of (i) the status of theoretical efforts towards the calculation of higher-order Standard Model (SM) corrections needed for the FCC-ee precision measurement programme, (ii) the possibility of making discoveries in physics by means of these precision measurements, and (iii) methods and tools that must be developed to guarantee precision calculations of the observables to be measured. This report originates from presentations at the 11th...

CoLoRFulNNLO at work: a determination of αs

A. Kardos, S. Kluth, G. Somogyi, Z. Trócsányi, Z. Tulipánt & A. Verbytskyi
The most precise determination of fundamental parameters of the Standard Model is very important. One such fundamental parameter is the strong coupling of QCD. Its importance can be gauged by taking a look at the various experiments and configurations where it was measured; for an up-to-date summary. The precise measurement of such a parameter is difficult for two reasons. First, high-quality data with small and well-controlled uncertainties are needed. Second, high-precision calculations are needed from...

Top pair production and mass determination

A. Maier
The mass of the top quark can be measured in a well-defined scheme and with unrivalled precision at a future electron–positron collider, like the FCC-ee. The most sensitive observable is the total production cross-section for bbbarW+W-X final states near the top pair production threshold. I review the state of the art in theory predictions for this quantity.

Numerical multiloop calculations: sector decomposition and QMC integration in pySecDec

S. Borowka, G. Heinrich, S. Jahn, S.P. Jones, M. Kerner & J. Schlenk
The FCC-ee will allow the experimental uncertainties on several important observables, such as the electroweak precision observables (EWPOs), to be reduced by up to two orders of magnitude compared with the previous generation LEP and SLC experiments. To be able to best exploit this unprecedented boost in precision, it is also necessary for theoretical predictions to be known with sufficient accuracy. In practice, this means that very high-order perturbative corrections to electroweak precision observables and...

Recent developments in Kira

P. Maierhöfer & J. Usovitsch
In this section, we report on the recent progress made in the development of the Feynman integral reduction program Kira. The development is focused on algorithmic improvements that are essential to extend the range of feasible high-precision calculations for present and future colliders like the FCC-ee.

Future physics opportunities for high-density QCD at the LHC with heavy-ion and proton beams

Editors: Z. Citron, A. Dainese, J. F. Grosse-Oetringhaus, J. M. Jowett, Y.-J. Lee & U. A. Wiedemann
The future opportunities for high-density QCD studies with ion and proton beams at the LHC are presented. Four major scientific goals are identified: the characterisation of the macroscopic long wavelength Quark-Gluon Plasma (QGP) properties with unprecedented precision, the investigation of the microscopic parton dynamics underlying QGP properties, the development of a unified picture of particle production and QCD dynamics from small (pp) to large (nucleus--nucleus) systems, the exploration of parton densities in nuclei in a...

CERN Yellow Reports: Monographs, Vol. 6 (2020): Linac4 design report

Editor: Maurizio Vretenar Linear accelerator 4 (Linac4) is designed to accelerate negative hydrogen ions for injection into the Proton Synchrotron Booster (PSB). It will become the source of proton beams for the Large Hadron Collider (LHC) after the long shutdown in 2019–2020. Linac4 will accelerate H– ions, consisting of a hydrogen atom with an additional electron, to 160 MeV energy and then inject them into the PSB, which is part of the LHC injection chain....

Lattice considerations

D. Einfeld
No abstract.

Beam dynamics and layout of the SEE-LS

D. Einfeld & H. Ghasem
No abstract.

Diagnostic system

F. Perez
No abstract.

Building, infrastructure, and site

D. Einfeld
No abstract.

Organization

D. Einfeld
No abstract.

Collider-experiment interface

F. Sanchez Galan, H. Burkhardt, F. Cerrutti, A. Gaddi, J.L. Grenard, L. Krzempek, M. Lino Diogo Dos Santos, J. Perez Espinos, M. Raymond & P. Santos Diaz
The HL-LHC targeted luminosities for the four main experiments will require upgrades of multiple subsystems in In particular, the LHCb experiment subsystems as the vertex locator (VELO), the ring-imaging Cherenkov (RICH) detectors and the tracking system will undergo a major upgrade in LS2, and its surrounding protection systems will be upgraded with neutral absorbers (TANB) to allow to reach the HL-LHC foreseen peak luminosity as from Run 3. Also, in LS2, ALICE will replace its...

Insertion magnets

E. Todesco & P. Ferracin
In general, magnets will be tested individually in a vertical test station, and then horizontally in the final cold mass assembly within the final cryostat, with the exception of Q2 and D2 whose length does not allow vertical testing. Many power tests will be done in laboratories collaborating with CERN (BNL for vertical test of Q1/Q3, FNAL for horizontal test of Q1/Q3, KEK for vertical test of D1, LASA for vertical test of high order...

List of machine and beam parameters

The Editorial Team
No abstract.

Overview of radiation effects on detector systems

I. Dawson, F. Faccio, M. Moll & A. Weidberg
In this section we give an overview of the effects of radiation on silicon detector systems in the LHC experiments. We divide the sections into: sensors; electronics; optoelectronics; services. While the physics of the energy loss between these categories is similar, the radiation quantities of interest used to evaluate damage are usually different. As an example, sensor radiation studies typically focus on the effects of bulk displacement damage, whereas degradation in electronics is generally more...

The LHC machine and experiments

A. Alici, M. Bomben, I. Dawson & J. Sonneveld
The Large Hadron Collider is a 26.7 km circular accelerator based on a twin aperture superconducting magnet design with a design proton beam energy of 7 TeV. The four particle physics experiments ALICE, ATLAS, CMS, and LHCb are located around the ring. The LHC was first operated with beams for short periods in 2008 and 2009. In 2010, a first experience with the machine was gained at a beam energy of 3.5 TeV, with moderate...

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