Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ultra Thin 3D Silicon Detector for Plasma Diagnostics at the ITER
  Tokamak   An ultra thin silicon detector called U3DTHIN has been designed and built for
neutral particle analyzers (NPA) and thermal neutron detection. The main
purpose of this detector is to provide a state-of-the-art solution for detector
system of NPAs for the ITER experimental reactor and to be used in combination
with a Boron conversion layer for the detection of thermal neutrons. Currently
the NPAs are using very thin scintillator - photomultiplier tube, and their
main drawbacks are poor energy resolution, intrinsic scintillation
nonlinearity, relative low count rate capability and finally poor signal to
background discrimination power 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. To achieve a very fast charge
collection of the carriers generated by the ions detection 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 energy dynamic range of the detected ions. An
entrance window with a thickness of tens of nanometers together with a
sensitive substrate thickness varying from less than 5 microns, to detect the
lowest energetic ions to 20 microns for the height ones has been selected after
simulations with GEANT4. To increase the signal to background ratio the
detector will operate in spectroscopy regime allowing to perform pulse-height
analysis. The technology used to fabricate these 3D ultra thin detectors
developed at Centro Nacional de Microelectronica in Barcelona and the first
signals from an alpha source (241Am) will presented

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The categories of this paper are: quant-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: q-bio
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The categories of this paper are: patt-sol
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The categories of this paper are: astro-ph
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The categories of this paper are: math-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-th
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The categories of this paper are: alg-geom
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The categories of this paper are: comp-gas
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The categories of this paper are: atom-ph
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The categories of this paper are: econ
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The categories of this paper are: stat
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The categories of this paper are: q-alg
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The categories of this paper are: plasm-ph
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The categories of this paper are: chao-dyn