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

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Garcia , F , Pellegrini , G , Lozano , M , Balbuena , J , Fleta , C , Guardiola , C & Quirion , D 2011 , Ultra Thin 3D Silicon Detector for Plasma Diagnostics at the ITER Tokamak . in Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2011 IEEE . IEEE Computer Society , pp. 199-201 , Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) , Valencia , Spain , 01/01/1800 . https://doi.org/10.1109/NSSMIC.2011.6154479

Title: Ultra Thin 3D Silicon Detector for Plasma Diagnostics at the ITER Tokamak
Author: Garcia, Francisco; Pellegrini, Giulio; Lozano, Manuel; Balbuena, Juan; Fleta, Celeste; Guardiola, Consuelo; Quirion, David
Contributor: University of Helsinki, Helsinki Institute of Physics
Publisher: IEEE Computer Society
Date: 2011
Language: eng
Number of pages: 3
Belongs to series: Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2011 IEEE
ISBN: 978-1-4673-0118-3
URI: http://hdl.handle.net/10138/37310
Abstract: 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.
Subject: 114 Physical sciences
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