Software Development and Testing: Approach and Challenges in a distributed HEP Collaboration

In developing the ATLAS [1] Trigger and Data Acquisition (TDAQ) software, the team is applying the iterative waterfall model, evolutionary process management, formal software inspection, and lightweight review techniques. The long preparation phase, with a geographically widespread development team required that the standard techniques be adapted to this HEP environment. The testing process is receiving special attention. Unit tests and check targets in nightly project builds form the basis for the subsequent software project release testing. The integrated software is then being run on computing farms that give further opportunites for gaining experience, fault finding, and acquiring ideas for improvement. Dedicated tests on a farm of up to 1000 nodes address the large-scale aspect of the project. Integration test activities on the experimental site include the special purpose-built event readout hardware. Deployment in detector commissioning starts the countdown towards running the final ATLAS experiment. These activities aim at both understanding and completing the complex system, and help in forming a team whose members have a variety of expertise, working cultures, and professional backgrounds

Development of a Detector Control System for the ATLAS Pixel Detector

The innermost part of the ATLAS experiment will be a pixel detector containing around 1750 individual detector modules. A detector control system (DCS) is required to handle thousands of I/O channels with varying characteristics. The main building blocks of the pixel DCS are the cooling system, the power supplies and the thermal interlock system, responsible for the ultimate safety of the pixel sensors. The ATLAS Embedded Local Monitor Board (ELMB), a multi purpose front end I/O system with a CAN interface, is foreseen for several monitoring and control tasks. The Supervisory, Control And Data Acquisition (SCADA) system will use PVSS, a commercial software product chosen for the CERN LHC experiments. We report on the status of the different building blocks of the ATLAS pixel DCS.Comment: 3 pages, 2 figures, ICALEPCS 200

Cambio de hábitos y transformaciones territoriales en los corredores de alta velocidad ferroviaria. Resultados de una encuesta de viajeros en la línea Madrid-Barcelona

El tren de alta velocidad (TAV) está viviendo un auge importante en España. Ello implica una transformación territorial como resultado de una modificación del comportamiento de los viajeros debido a una mejora en el transporte ferroviario interurbano. En este contexto hay un elemento que ha obtenido una atención insuficiente. Se trata del acceso a la estación como parte fundamental del viaje puerta-a-puerta. Para hacer frente a la carencia de datos estadísticos sobre este aspecto, hemos realizado una encuesta a los viajeros de alta velocidad en la línea Madrid – Barcelona, que ayuda responder a la pregunta: ¿Cómo llega el viajero a la estación? Es imprescindible conocer este aspecto para planificar y realizar actuaciones de mejora intermodal adecuadas. Los resultados muestran que el acceso en vehículo privado es preponderante y que existe la necesidad de ofrecer más alternativas atractivas para acceder a las estaciones. Se concluye además que las estaciones centrales son preferibles, ya que generan una movilidad más sostenible.The High-Speed Train is experiencing a considerable growth in Spain. This implies a territorial transformation, result of a modification of the travelers’ behavior due to an improvement of the interurban railway transportation. In this context, an element that has not received the necessary attention is, namely, the access to the station as a basic part of the door-to-door travel. To face the lack of statistics on railway station access trips, a passenger survey on the high-speed railway line Madrid-Barcelona has been realized in order to respond to the question: How does the passenger get to the station? The knowledge of this aspect is needed to plan and realize improvement on intermodal actions adequately. The results show a dominance of the private car and a need to offer more attractive alternatives to access the stations. Further conclusions drawn, depict that central stations should be preferred, as they generate a more sustainable mobility

Pedestal and Er profile evolution during an edge localized mode cycle at ASDEX Upgrade

The upgrade of the edge charge exchange recombination spectroscopy diagnostic at ASDEX Upgrade has enabled highly spatially resolved me asurements of the impurity ion dynamics during an edge-localized mode cycle ( ELM ) with unprecedented temp oral resolution, i.e. 65 μ s. The increase of transport during an ELM induces a relaxation of the ion, electron edge gradients in impurity density and fl ows. Detailed characterization of the recovery of the edge temperature gradients reveals a difference in the ion and electron channe l: the maximum ion temperature gradient T i is re-established on similar timescales as n e , which is faster than the recovery of T e .Afterthe clamping of the maximum gradient, T i and T e at the pedestal top continue to rise up to the next ELM while n e stays constant which means that the temperatur e pedestal and the resu lting pedestal pressure widen until the next ELM. The edge radial electric fi eld E r at the ELM crash is found to reduce to typical L-mode values and its ma ximum recovers to its pre-ELM conditions on a similar time scale as for n e and T i . Within the uncertainties, the measurements of E r align with their neoclassical predictions E r,neo for most of the ELM cycle, thus indicating that E r is dominated by collisional processes. However, between 2 and 4 ms af ter the ELM crash, other contributions to E B ́ fl ow, e.g. zonal fl ows or ion orbit effects, could not be excluded within the uncertainties.European Commission (EUROfusion 633053

The Embedded Local Monitor Board (ELMB) in the LHC Front-end I/O Control System

The Embedded Local Monitor Board is a plug-on board to be used in LHC detectors for a range of different front-end control and monitoring tasks. It is based on the CAN serial bus system and is radiation tolerant and can be used in magnetic fields. The main features of the ELMB are described and results of several radiation tests are presented. I