Ultra-thin 3D silicon sensors for neutron detection

We present a novel neutron detector based on an ultra-thin 3D silicon sensor with a sensitive volume only 10 µm thick. This ultra-thin active volume allows a high gamma-ray rejection, a key requirement in order to discriminate the signal coming from the neutrons in a mixed neutron-gamma ray environment. The device upper-side is covered with a novel boron-based compound that detects neutrons by means of the 10B(n,α)7Li nuclear reaction. The performance of test devices has been investigated first with a gamma-ray source to evaluate the gamma-ray rejection factor, and then with an 241AmBe neutron source to assess the neutron-gamma ray discrimination properties.Peer reviewe

Programa de salud dirigido a padres con hijos con trastorno de déficit de atención e hiperactividad en atención primaria

Introducción: el trastorno por déficit de atención e hiperactividad (TDAH) es uno de los trastornos psicológicos más frecuentes en la infancia, y se caracteriza por la tríada: inatención, impulsividad e hiperactividad. Esto interfiere con el correcto desarrollo del niño. Se desconocen las causas que lo producen, aunque se cree que tiene origen neurofisiológico. El diagnóstico de TDAH es multidisciplinar y fundamentalmente clínico, basado en la observación de padres y profesores. El tratamiento con mejores resultados es un tratamiento multimodal, con la combinación de tratamiento farmacológico, psicológico y psicopedagógico. Existe una falta de coordinación entre colegio y centro de salud para el diagnóstico y tratamiento de estos niños, por lo que se necesita una figura de referencia que actúe como nexo, que podría ser la enfermera de centro de salud. Objetivos: realizar un programa de educación para la salud para padres con niños con TDAH. Metodología: se realiza una búsqueda bibliográfica en diferentes bases de datos, libros y páginas web para la planificación del programa de salud. Desarrollo: se van a desarrollar 4 sesiones a lo largo de dos meses en un centro de salud de Zaragoza, todas ellas orientadas a mejorar el diagnóstico afrontamiento familiar comprometido. Se realizará con un máximo de 20 padres, de niños de entre 5 y 16 años que residan en el barrio Actur. Conclusiones: con la realización de este programa de salud ha habido una mejoría notable en la actitud de los padres frente a la enfermedad, y por lo tanto se ha conseguido un entorno familiar mejor. Además se ha buscado demostrar el papel tan importante de enfermería en la educación para salud en atención primaria.<br /

Ultra Thin 3D Silicon Detector for Plasma Diagnostics at the ITER Tokamak

An ultra thin silicon detector called U3DTHIN[1,2] has been designed and built to be used in detection systems for Neutral particle analyzers (NPA). The main purpose of this detector is to provide a state-of-the-art solution for NPAs at ITER experimental reactor. In the past the NPAs were using very thin scintillators read out by photomultiplier tubes[3,4], and their main drawbacks were poor energy resolution, intrinsic scintillation non-linearity, relative low count rate capability and finally poor signal-to-background separation for the low energy channels. The proposed U3DTHIN detector is based on very thin sensitive substrate which will provide nearly 100% detection efficiency for ions and at the same time very low sensitivity for the neutron and gamma radiation background. To achieve a very fast charge collection of the carriers generated by the ions a 3D electrode structure[5] has been introduced in the sensitive volume of the detector. One of the most innovative features of these detectors has been the optimal combination of the thin entrance window and the sensitive substrate thickness, to accommodate very large dynamic range primary ions energy. With an entrance window of tens of nanometers; together with a sensitive substrate thickness of less than 5 μm we used them for the low energetic channels and lest than 20 μm for the medium and high energetic ones. In order to find the optimal Signal to background ratio simulations with GEANT4 and TCAD has been performed. The first results obtained during characterization of such U3DTHIN detectors will be presented.Non peer reviewe

Tecnología de detectores de partículas de silicio resistentes a la radiación

Descripció del recurs: el 21 setembre 2011Penden

Mapping the depleted area of silicon diodes using a micro-focused X-ray beam

For the Phase-II Upgrade of the ATLAS detector at CERN, the current ATLAS Inner Detector will be replaced with the ATLAS Inner Tracker. The ATLAS Inner Tracker will be an all-silicon detector, consisting of a pixel tracker and a strip tracker. Sensors for the ITk strip tracker are required to have a low leakage current up to bias voltages of -700 V to maintain a low noise and power dissipation. In order to minimise sensor leakage currents, particularly in the high-radiation environment inside the ATLAS detector, sensors are foreseen to be operated at low temperatures and to be manufactured from wafers with a high bulk resistivity of several k{\Omega} cm. Simulations showed the electric field inside sensors with high bulk resistivity to extend towards the sensor edge, which could lead to increased surface currents for narrow dicing edges. In order to map the electric field inside biased silicon sensors with high bulk resistivity, three diodes from ATLAS silicon strip sensor prototype wafers were studied with a monochromatic, micro-focused X-ray beam at the Diamond Light Source. For all devices under investigation, the electric field inside the diode was mapped and its dependence on the applied bias voltage was studied. The findings showed that the electric field in each diode under investigation extended beyond its bias ring and reached the dicing edge

Microdosimetry in low energy proton beam at therapeutic-equivalent fluence rate with silicon 3D-cylindrical microdetectors

In this work we show the first microdosimetry measurements on a low energy proton beam with therapeutic-equivalent fluence rates by using the second generation of 3D-cylindrical microdetectors. The sensors belong to an improved version of a novel silicon-based 3D-microdetector design with electrodes etched inside silicon, which were manufactured at the National Microelectronics Centre (IMB-CNM, CSIC) in Spain. A new microtechnology has been employed using quasi-toroid electrodes of 25μm diameter and a depth of 20μm within the silicon bulk, resulting in a well-defined cylindrical radiation sensitive volume. These detectors were tested at the 18 MeV proton beamline of the cyclotron at the National Accelerator Centre (CNA, Spain). They were assembled into an in-house low-noise readout electronics to assess their performance at a therapeutic-equivalent fluence rate. Microdosimetry spectra of lineal energy were recorded at several proton energies starting from 18 MeV by adding 50μm thick tungsten foils gradually at the exit-window of the cyclotron external beamline, which corresponds to different depths along the Bragg curve. The experimentalyF¯values in silicon cover from (5.7 ± 0.9) to (8.5 ± 0.4) keV μm-1in the entrance to (27.4 ± 2.3) keV μm-1in the distal edge. Pulse height energy spectra were crosschecked with Monte Carlo simulations and an excellent agreement was obtained. This work demonstrates the capability of the second generation 3D-microdetectors to assess accurate microdosimetric distributions at fluence rates as high as those used in clinical centers in proton therapy

3D active edge silicon sensors: Device processing, yield and QA for the ATLAS-IBL production

n/

The ABC130 barrel module prototyping programme for the ATLAS strip tracker

For the Phase-II Upgrade of the ATLAS Detector, its Inner Detector, consisting of silicon pixel, silicon strip and transition radiation sub-detectors, will be replaced with an all new 100 % silicon tracker, composed of a pixel tracker at inner radii and a strip tracker at outer radii. The future ATLAS strip tracker will include 11,000 silicon sensor modules in the central region (barrel) and 7,000 modules in the forward region (end-caps), which are foreseen to be constructed over a period of 3.5 years. The construction of each module consists of a series of assembly and quality control steps, which were engineered to be identical for all production sites. In order to develop the tooling and procedures for assembly and testing of these modules, two series of major prototyping programs were conducted: an early program using readout chips designed using a 250 nm fabrication process (ABCN-25) and a subsequent program using a follow-up chip set made using 130 nm processing (ABC130 and HCC130 chips). This second generation of readout chips was used for an extensive prototyping program that produced around 100 barrel-type modules and contributed significantly to the development of the final module layout. This paper gives an overview of the components used in ABC130 barrel modules, their assembly procedure and findings resulting from their tests.Comment: 82 pages, 66 figure

Research and Design of a Routing Protocol in Large-Scale Wireless Sensor Networks

无线传感器网络，作为全球未来十大技术之一，集成了传感器技术、嵌入式计算技术、分布式信息处理和自组织网技术，可实时感知、采集、处理、传输网络分布区域内的各种信息数据，在军事国防、生物医疗、环境监测、抢险救灾、防恐反恐、危险区域远程控制等领域具有十分广阔的应用前景。 本文研究分析了无线传感器网络的已有路由协议，并针对大规模的无线传感器网络设计了一种树状路由协议，它根据节点地址信息来形成路由，从而简化了复杂繁冗的路由表查找和维护，节省了不必要的开销，提高了路由效率，实现了快速有效的数据传输。 为支持此路由协议本文提出了一种自适应动态地址分配算——ADAR（AdaptiveDynamicAddre...As one of the ten high technologies in the future, wireless sensor network, which is the integration of micro-sensors, embedded computing, modern network and Ad Hoc technologies, can apperceive, collect, process and transmit various information data within the region. It can be used in military defense, biomedical, environmental monitoring, disaster relief, counter-terrorism, remote control of haz...学位：工学硕士院系专业：信息科学与技术学院通信工程系_通信与信息系统学号：2332007115216

Development of 3D detectors for very high luminosity colliders

3D solid state detectors have very promising characteristics for particle trackers in harsh radiation environments such as the expected after the proposed luminosity upgrade of the large hadron collider at CERN. Different 3D technologies, including single- and double- type column and full 3D detectors, are being evaluated by the CERN RD50 collaboration. In this review the most recent work will be presented and discussed