Development and Characterisation of Radiation Monitoring Sensors for the High Energy Physics Experiments of the CERN LHC Accelerator

The Radiation monitoring at the High Energy Physic experiments of the LHC, the next CERN particle accelerator, will be a challenge for the existing dosimetry technologies. The radiation environment generated by the high-energy proton collisions will be complex reaching locally very high levels. The measurement of the energy deposition, in the IEL and NIEL channels, for semiconductor materials will therefore help to insure the reliability of the electronic systems during the LHC operation. In this work, the qualification of RadFET and p-i-n diode dosimeters, suitable for the measurements in the LHC radiation field, is presented. A series of two RadFETs and two p-i-n diodes have been then selected and characterized in detail in view of their installation at the LHC. Sensors integration issues, supported by Monte Carlo simulations studies, are also presented. Finally, the applicability of OSL materials for the dosimetry of the mixed fields at the LHC has been also discussed here

The Open Review-Based (ORB) dataset: Towards Automatic Assessment of Scientific Papers and Experiment Proposals in High-Energy Physics

With the Open Science approach becoming important for research, the evolution towards open scientific-paper reviews is making an impact on the scientific community. However, there is a lack of publicly available resources for conducting research activities related to this subject, as only a limited number of journals and conferences currently allow access to their review process for interested parties. In this paper, we introduce the new comprehensive Open Review-Based dataset (ORB); it includes a curated list of more than 36,000 scientific papers with their more than 89,000 reviews and final decisions. We gather this information from two sources: the OpenReview.net and SciPost.org websites. However, given the volatile nature of this domain, the software infrastructure that we introduce to supplement the ORB dataset is designed to accommodate additional resources in the future. The ORB deliverables include (1) Python code (interfaces and implementations) to translate document data and metadata into a structured and high-level representation, (2) an ETL process (Extract, Transform, Load) to facilitate the automatic updates from defined sources and (3) data files representing the structured data. The paper presents our data architecture and an overview of the collected data along with relevant statistics. For illustration purposes, we also discuss preliminary Natural-Language-Processing-based experiments that aim to predict (1) papers' acceptance based on their textual embeddings, and (2) grading statistics inferred from embeddings as well. We believe ORB provides a valuable resource for researchers interested in open science and review, with our implementation easing the use of this data for further analysis and experimentation. We plan to update ORB as the field matures as well as introduce new resources even more fitted to dedicated scientific domains such as High-Energy Physics.Comment: 13 pages, supplementary material included, dataset availabl

The radiation field in the Gamma Irradiation Facility GIF++ at CERN

The high-luminosity LHC (HL-LHC) upgrade is setting now a new challenge for particle detector technologies. The increase in luminosity will produce a particle background in the gas-based muon detectors that is ten times higher than under conditions at the LHC. The detailed knowledge of the detector performance in the presence of such a high background is crucial for an optimized design and efficient operation after the HL-LHC upgrade. A precise understanding of possible aging effects of detector materials and gases is of extreme importance. To cope with these challenging requirements, a new Gamma Irradiation Facility (GIF++) was designed and built at the CERN SPS North Area as successor of the Gamma Irradiation Facility (GIF) during the Long Shutdown 1 (LS1) period. It features an intense source of 662 keV photons with adjustable intensity, to simulate continuous background over large areas, and, combined with a high energy muon beam, to measure detector performance in the presence of the background. The new GIF++ facility has been operational since spring 2015. In addition to describing the facility and its infrastructure, the goal of this work is to provide an extensive characterization of the GIF++ photon field with different configurations of the absorption filters in both the upstream and downstream irradiation areas. Moreover, the measured results are benchmarked with Geant4 simulations to enhance the knowledge of the radiation field. The absorbed dose in air in the facility may reach up to 2.2 Gy/h directly in front of the irradiator. Of special interest is the low-energy photon component that develops due to the multiple scattering of photons within the irradiator and from the concrete walls of the bunker

Dosimetry Techniques and Radiation Test Facilities for Total Ionizing Dose Testing

This paper will address dosimetry and monitoring techniques for total ionizing dose (TID) testing of electronics devices. We will first discuss the basic principles of dosimetry, as well as the most common dosimetric quantities and units, used for the determination of the energy deposited in a given medium by ionizing radiation. In Section III , we will give an overview of the available dosimetry techniques for ionizing radiation, along with the basic mechanisms exploited for their operation. In Section IV , we will address issues and factors affecting the dosimetry measurements, as well as we will give some practical “hints” about the selection and use of the presented techniques. Finally, a synthesis of the existing radiation test facilities, focusing on the one for TID testing, will be given in Section V . Their interest, limitations, and some practical aspects involving the organization of radiation test campaigns will also be discussed in this paper

Characterization and development of radiation monitoring sensors for the high energy physics experiments of the CERN LHC accelerator

MONTPELLIER-BU Sciences (341722106) / SudocSudocFranceF

Ontology Embeddings with ontowalk2vec: an Application to UI Personalisation

Within software applications, user experience is greatly improved when user interface (UI) personalisation is possible, and even more so when recommender systems can help users find the set of settings best suited for their skills and goals. In this paper, we suggest that such recommender systems should be based on ontologies dedicated to describing both software traits and user preferences, an example of which is the Ontology-based Web Application Generation ontology (OWAO) that specifies what web applications and their UI are. The key scientific contribution of our approach is ontowalk2vec, an algorithm that maps instances of ontologies to feature vectors (embeddings) that can be later on used for classification purposes, a process inherent to recommender systems. In addition to OWAO, we validate ontowalk2vec on two other significant ontologies, namely MUTAG and DBpedia, where we demonstrate it outperforms existing techniques. We finally discuss how using ontowalk2vec on OWAO can form the basis of personalised UI recommender systems, stressing, in particular, the importance of properly setting the many hyperparameters that typically characterise embedding-generation algorithms

Automatic Web Application Generation from an Irradiation Experiment Data Management Ontology (IEDM)

International audienc

IEDM, an Ontology for Irradiation Experiment Data Management

International audienceIrradiation Experiments Irradiation experiments (IE) are an essential step in the development of High-Energy Physics (HEP) particle accelerators and detectors. They are used to assess the radiation hardness of experimental devices by simulating, in a short time, the common long-term degradation effects due to energy loss in matter. Usually carried out with ionizing radiation, these complex processes require highly specialized infrastructures called "irradiation facilities". Aiming to promote knowledge sharing and digital management of IEs, we introduce IEDM, a new Irradiation Experiments Data Management ontology. This work presents an overview of the key concepts and structure of IEDM while discussing possible applications

Performance Studies of an Optical Fiber OSL/RL Dosimetry System in Pulsed High-intensity Radiation Beams.

The SrS:Ce,Sm phosphor is suitable for operation in harsh radiation environments where real-time dosimetry measurements are needed to survey the Total Ionizing Dose (TID) damage in electronic components. For these applications, the OSL and RL emissions from this phosphor can be exploited by mounting the SrS crystal at the edge of a single, radiation-hard, optical fiber. In this work we present an exhaustive characterization of this real-time OSL/RL probe including stability, repeatability of the measured signals, dosimetry performance and measurements of the temporal behavior of the RI signal in pulsed particle beams. (C) 2009 Elsevier Ltd. All rights reserved