Abstract
High energy collisions at the High-Luminosity Large Hadron Collider (LHC) produce a large number of particles along the beam collision axis, outside of the acceptance of existing LHC ...experiments. The proposed Forward Physics Facility (FPF), to be located several hundred meters from the ATLAS interaction point and shielded by concrete and rock, will host a suite of experiments to probe standard model (SM) processes and search for physics beyond the standard model (BSM). In this report, we review the status of the civil engineering plans and the experiments to explore the diverse physics signals that can be uniquely probed in the forward region. FPF experiments will be sensitive to a broad range of BSM physics through searches for new particle scattering or decay signatures and deviations from SM expectations in high statistics analyses with TeV neutrinos in this low-background environment. High statistics neutrino detection will also provide valuable data for fundamental topics in perturbative and non-perturbative QCD and in weak interactions. Experiments at the FPF will enable synergies between forward particle production at the LHC and astroparticle physics to be exploited. We report here on these physics topics, on infrastructure, detector, and simulation studies, and on future directions to realize the FPF’s physics potential.
The safety of industrial sites or large research facilities such as CERN (European Organization for Nuclear Research) is obtained by the combined actions of physical security, cyber-security and ...functional safety that jointly contribute to risk reduction. To deal with functional safety, the IEC 61508-61511-61513 standards are used for regulating design, development and maintenance of the Safety Instrumented Systems (SIS) that implement Safety Instrumented Functions. The SIF’s performance is characterized by its Safety Integrity Level (SIL) determined through a risk analysis and conditioned by parameters related to the design, the staff’s skills involved in its development, operation and maintenance or the compliance with repairing times. Heads of facility and SIS responsible persons have to continuously master the SIL performance. This is a responsible act to guarantee the risks reduction barriers efficiencies, considering criteria such as periodic testing, spare parts availability, components obsolescence, by-passes, changes control, system real-time status, physical and cyber protections. The Safety Status software imagined jointly by CERN and ASSYSTEM inherits both the CERN experience on the specification and operation of safety systems adapted to the specific risks of particle accelerators and experiments and the know-how developed by ASSYSTEM as a major player in the engineering of nuclear installations, particularly in the field of design and maintenance of critical security and control systems. Safety Status establishes a functional safety dashboard of each system updated automatically or manually with data coming from relevant sources such as maintenance management, document management or the SIS itself. Through a friendly interface, it displays an overview of all the useful information that illustrates the health of the SIS and the integrity of its safety functions. After intro- ducing the concept, the paper presents the methodology, the main features of the software, and the experience feedback gained by its implementation on the CERN MEDICIS facility
INTEGRATED OPERATIONAL DOSIMETRY SYSTEM AT CERN Dumont, Gérald; Pedrosa, Fernando Baltasar Dos Santos; Carbonez, Pierre ...
Radiation protection dosimetry,
04/2017, Letnik:
173, Številka:
1-3
Journal Article
Recenzirano
CERN, the European Organization for Nuclear Research, upgraded its operational dosimetry system in March 2013 to be prepared for the first Long Shutdown of CERN's facilities. The new system allows ...the immediate and automatic checking and recording of the dosimetry data before and after interventions in radiation areas. To facilitate the analysis of the data in context of CERN's approach to As Low As Reasonably Achievable (ALARA), this new system is interfaced to the Intervention Management Planning and Coordination Tool (IMPACT). IMPACT is a web-based application widely used in all CERN's accelerators and their associated technical infrastructures for the planning, the coordination and the approval of interventions (work permit principle). The coupling of the operational dosimetry database with the IMPACT repository allows a direct and almost immediate comparison of the actual dose with the estimations, in addition to enabling the configuration of alarm levels in the dosemeter in function of the intervention to be performed.
It is currently quite easy for students or designers/engineers to find very general books on the various aspects of safety, reliability and dependability of computer system architectures, and partial ...treatments of the elements that comprise an effective system architecture. It is not so easy to find a single source reference for all these aspects of system design. However, the purpose of this book is to present, in a single volume, a full description of all the constraints (including legal contexts around performance, reliability norms, etc.) and examples of architectures from various fields of application, including: railways, aeronautics, space, automobile and industrial automation. The content of the book is drawn from the experience of numerous people who are deeply immersed in the design and delivery (from conception to test and validation), safety (analysis of safety: FMEA, HA, etc.) and evaluation of critical systems. The involvement of real world industrial applications is handled in such as a way as to avoid problems of confidentiality, and thus allows for the inclusion of new, useful information (photos, architecture plans/schematics, real examples).
As part of the main focus of the BDF Working Group in 2021, this document reports on the study of alternative locations and possible optimisation that may accompany the reuse of existing facilities ...with the aim of significantly reducing the costs of the facility. Building on the BDF/SHiP Comprehensive Design Study (CDS), the assessment rests on the generic requirements and constraints that allow preserving the physics reach of the facility by making use of the \(4\times 10^{19}\) protons per year at 400\,GeV that are currently not exploited at the SPS and for which no existing facility is compatible. The options considered involve the underground areas TCC4, TNC, and ECN3. Recent improvements of the BDF design at the current location (referred to as `TT90-TCC9-ECN4') are also mentioned together with ideas for yet further improvements. The assessments of the alternative locations compiled the large amount of information that is already available together with a set of conceptual studies that were performed during 2021. The document concludes with a qualitative comparison of the options, summarising the associated benefits and challenges of each option, such that a recommendation can be made about which location is to be pursued. The most critical location-specific studies required to specify the implementation and cost for each option are identified so that the detailed investigation of the retained option can be completed before the end of 2022.
CERN (European Organization for Nuclear Research) is an international particle physics laboratory located in Geneva, Switzerland. CERN carries out fundamental research in particle and nuclear physics ...using several large particle accelerators, including the Large Hadron Collider (CERN 2015).
An automatic method for constructing linear relaxations of constrained global optimization problems is proposed. Such a construction is based on affine and interval arithmetics and uses operator ...overloading. These linear programs have exactly the same numbers of variables and inequality constraints as the given problems. Each equality constraint is replaced by two inequalities. This new procedure for computing reliable bounds and certificates of infeasibility is inserted into a classical branch and bound algorithm based on interval analysis. Extensive computation experiments were made on 74 problems from the COCONUT database with up to 24 variables or 17 constraints; 61 of these were solved, and 30 of them for the first time, with a guaranteed upper bound on the relative error equal to
10
-
8
. Moreover, this sample comprises 39 examples to which the GlobSol algorithm was recently applied finding reliable solutions in 32 cases. The proposed method allows solving 31 of these, and 5 more with a CPU-time not exceeding 2 min.
The Small Octagons of Maximal Width Audet, Charles; Hansen, Pierre; Messine, Frédéric ...
Discrete & computational geometry,
04/2013, Letnik:
49, Številka:
3
Journal Article
Recenzirano
Odprti dostop
The paper answers an open problem introduced by Bezdek and Fodor (Arch. Math. 74:75–80,
2000
). The width of any unit-diameter octagon is shown to be less than or equal to
and there are infinitely ...many small octagons having this optimal width. The proof combines geometric and analytical reasoning as well as the use of a recent version of the deterministic and reliable global optimization code IBBA based on interval and affine arithmetics. The code guarantees a certified numerical accuracy of
.
The Small Octagons of MaximalWidth Audet, Charles; Hansen, Pierre; Messine, Frédéric ...
Discrete & computational geometry,
04/2013, Letnik:
49, Številka:
3
Journal Article
Recenzirano
The paper answers an open problem introduced by Bezdek and Fodor (Arch. Math. 74:75-80, 2000). The width of any unit-diameter octagon is shown to be less than or equal to 1 4 10+27 √ − − − − − − − √ ...and there are infinitely many small octagons having this optimal width. The proof combines geometric and analytical reasoning as well as the use of a recent version of the deterministic and reliable global optimization code IBBA based on interval and affine arithmetics. The code guarantees a certified numerical accuracy of 1×10 −7 .
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