The evaluation of radiation damage parameter for CVD diamond

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:372

Article

Grilj, V.¹  Skukan, N.¹  Jaksic, M.¹  Pomorski, M.²  Kada, W.³  Kamiya, T.⁴  Ohshima, T.⁴ 

[1] Rudjer Boskovic Inst, Div Expt Phys, Zagreb 10000, Croatia

[2] CEA, LIST, Diamond Sensors Lab, F-91191 Gif Sur Yvette, France

[3] Gunma Univ, Fac Sci & Technol, Div Elect & Informat, Kiryu, Gunma 3768515, Japan

[4] Japan Atom Energy Agcy, Takasaki, Gunma 3701292, Japan

关键词: Radiation hardness;    CVD diamond;    Detector irradiation;   

DOI  :  10.1016/j.nimb.2015.12.046

来源: Elsevier

【 摘 要 】

There are a few different phenomenological approaches that aim to track the dependence of signal height in irradiated solid state detectors on the fluence of damaging particles. However, none of them are capable to provide a unique radiation hardness parameter that would reflect solely the material capability to withstand high radiation environment. To extract such a parameter for chemical vapor deposited (CVD) diamond, two different diamond detectors were irradiated with proton beams in MeV energy range and subjected afterwards to ion beam induced charge (IBIC) analysis. The change in charge collection efficiency (CCE) due to defects produced was investigated in context of a theoretical model that was developed on the basis of the adjoint method for linearization of the continuity equations of electrons and holes. Detailed modeling of measured data resulted with the first known value of the k sigma product for diamond, where k represents the number of charge carriers' traps created per one simulated primary lattice vacancy and a represents the charge carriers' capture cross section. As discussed in the text, this product could be considered as a true radiation damage parameter. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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