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Communication Dans Un Congrès Année : 2019

Single Crystal Diamond detectors characterization for 235U fission fragments detection at LOHENGRIN

A. Bes
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Y.H. Kim
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Résumé

Intrinsic electronic properties of diamond make it suitable for radiation-hard and very fast detectors development with good signal to noise ratio. For instance, radiation hardness has been already proven. The high mobility of electrons and holes grants it a fast time response and a good time resolution, finally, the large gap results in a lower noise level and an almost negligible leakage current. The aim of this study is to characterize single-crystal diamond detectors for 235U fission fragment detection at the mass spectrometer LOHENGRIN located at Institut Laue Langevin Grenoble France. The LOHENGRIN spectrometer allows fission fragment separation according to their kinetic energy (E), mass (A) and ionic charge (q). It follows that only one (at most two) fission fragment can be selected at a time. In this study we tested two CVD (Chemical Vapor Deposition) single crystal diamond with different thickness. Hence it allowed for exploring the influence of the thickness and the electric field on fission fragment detection. The conclusion was drawn that both detectors have the ability to distinguish between two fission fragments that have the same combination of energy (E), mass (A) and ionic charge (q) and thus are selected simultaneously by the spectrometer within a difference in kinematic energy at worst of 5 MeV. Furthermore, the energy resolution for both detectors is comparable, slightly better for the thin detector ~1.4% than for the thicker one ~1.6%. This energy resolution was measured on fission fragment A=98 at the energy of 90 MeV. The time resolution measured on the diamond signal pulse shape was found to be ~9.5 ps for the same fragment at the same energy. Finally, Pulse Height Defect (PHD) which is proven repeatedly to be present in silicon detector was also investigated with diamond material. The PHD is defined as the difference between the energy of the incident particle and the energy derived from the electrical signal. Results from alpha and triton measurements permit us to demonstrate that diamond detectors, as silicon detectors, are affected by PHD which leads to a loss of around 50% from the initial signal
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Dates et versions

hal-02382739 , version 1 (27-11-2019)

Identifiants

  • HAL Id : hal-02382739 , version 1

Citer

M.L. Gallin-Martel, S. Brambilla, A. Bes, G. Bosson, J. Collot, et al.. Single Crystal Diamond detectors characterization for 235U fission fragments detection at LOHENGRIN. JSPS-CNRS diamond detector workshop 2019, Oct 2019, Yuzawa city, Akita, Japan. ⟨hal-02382739⟩
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