Mobile CT-System for In-situ Inspection in the LHC at CERN

At the European Organisation for Nuclear Research ( CERN) the worlds largest particle accelerator ring, the Large Hadron collider (LHC), is being put into operation. It has been found useful to have a tool for diagnosis of the st ate of components in the interconnection regions of the LHC. This tool, for non-destructive testing (NDT) must w ork without opening the interconnection elements, without breaking the inte grity of the vacuum, and without the need to warm up the sector which would be costly an d time consuming. In addition the NDT tool has to be transportable in order to positi on it anywhere around the 27 km long LHC ring. The approach is an X-Ray inspection with the aim of an unambiguous representation of all structural elements in the interconnection regi ons of the LHC ring. The minimum criterion is to achieve an inspection result which allows verification of the correct position and integrity of all important components. 3D X-Ray computed tomography (3D CT) would be the i deal solution for such an inspection task. But due to the constraints in the LHC tunnel, especially the very limited space behind the LHC ring it is not possible to mov e an X-Ray source and a digital X- Ray detector completely around the interconnections . Therefore it was necessary to develop a mobile 3D X-Ray system which allows for a maximum scanning versatility within the given constraints and provide 3D results based on limited scan angles. Such a mobile X-Ray system is presented in this pap er as well as results from the inspections of the LHC ring interconnections. In addition it will be outlined how the approach us ed in this system could be applied to other applications

Combined Laser Alloying/Dispersing and Plasma Nitriding, an Efficient Treatment for Improving the Service Lifetime of the Forging Tools

During the application, the active surface of the forging dies is subjected to intense mechanical and thermal stresses combined with chemical oxidation. The fatigue resistance is an important characteristic which limits the service lifetime of the forging tools. This characteristic was significantly improved by a combined treatment between laser alloying/dispersing and plasma nitriding. This treatment was developed for W1.2365 and W1.2344 steels using TiC and WC + Co powders as additive materials. The surface layers have been examined by optical microscopy, glow discharge optical spectrometry (GDOS), energy dispersive X-ray (EDX), X-ray microtomography and other techniques. The combined treatment was successfully applied to a number of 13 forging tools from 4 European Companies, leading to an increase of their lifetime by factors ranging between 180 and 270%

Media 1: NIR to Vis-NIR up-conversion and X-ray excited emission of Er doped high Z BiOCl

Originally published in Optical Materials Express on 01 May 2015 (ome-5-5-951

AN ANTHROPOLOGICAL-MULTIDISCIPLINARY ANALYSIS OF THE CINERARY REMAINS DISCOVERED AT OCNIȚA - BURIDAVA PARS EST IN TOTO ET TOTUM EST IN PARTE

The archaeological research from 2016-2021 allowed us to identify in Buridava some types of archaeological structures that can also be found in other sites belonging to the classic Geto-Dacian era and which largely correspond to the discoveries of Dumitru Berciu from 1961-1992.The discoveries were made on terrace VIII, the last one on the western side of the bushy hills of Cosota. Looking back and benefiting today from multiple sources of analysis (LIDAR, aerial photography, etc.) we are convinced that all eight terraces and the Acropolis served starting from the last quarter of the 1st century BC and throughout the 1st century BC as a necropolis/sacred area. Our study is based on the analysis of the archaeological context; forensic anthropological analysis; serological analysis; X-ray microtomography (µXCT) and 3D reconstruction; SEM and EDS analyses; X-ray analysis, EDXRF spectrometry;The bones analysed are of human nature, a fact that is supported by their morphology, as well as by the serological and physical examinations that were carried out. There are a few exceptions where, due to the extremely small dimensions, further clarifications could not be made. The analyses focused on 1457 cremated fragments and various component parts of the bones of the human skeleton were identified.</p