Why neutron guides may end up breaking down? Some results on the macroscopic behaviour of alkali-borosilicate glass support plates under neutron irradiation

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

卷:358

Article

Boffy, R.¹  Kreuz, M.¹  Beaucour, J.¹  Koester, U.¹  Bermejo, F. J.² 

[1] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France

[2] CSIC, Inst Estruct Mat, E-20886 Madrid, Spain

关键词: Neutron guide;    Radiation damage;    Glass;    Neutron instruments;   

DOI  :  10.1016/j.nimb.2015.06.017

来源: Elsevier

【 摘 要 】

In this paper we report on a first part of a study on the mechanisms leading to brittle fracture in neutron guides made of glass as structural element. Such devices are widely used to deliver thermal and cold neutron beams to experimental lines in most large neutron research facilities. We present results on macroscopic properties of samples of guide glass substrates which are subjected to neutron irradiation at relatively large fluences. The results show a striking dependence of some of the macroscopic properties such as density, shape or surface curvature upon the specific chemical composition of a given glass. The relevance of the present findings for the installation of either replacement guides at the existing facilities or for the deployment of instruments for ongoing projects such as the European Spallation Source is briefly discussed. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

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