In-beam background suppression shield

被引：2

作者：

Santoro, V. ^{[1
]}

Cai, X. X. ^{[1
,2
]}

DiJulio, D. D. ^{[1
,3
]}

Ansell, S. ^{[1
]}

Bentley, P. M. ^{[1
,4
]}

机构：

[1] European Spallat Source ERIC, SE-22100 Lund, Sweden

[2] Tech Univ Denmark, DTU Nutech, Roskilde, Denmark

[3] Lund Univ, Dept Phys, SE-22100 Lund, Sweden

[4] Uppsala Univ, Dept Phys & Astron, S-75105 Uppsala, Sweden

来源：

JOURNAL OF NEUTRON RESEARCH | 2015年 / 18卷 / 04期

关键词：

Instrument backgrounds; sapphire; filter; neutrons; spallation source;

D O I：

10.3233/JNR-160034

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

The long (3 ms) proton pulse of the European Spallation Source (ESS) gives rise to unique and potentially high backgrounds for the instrument suite. In such a source an instrument's capabilities will be limited by its Signal to Noise (S/N) ratio. The instruments with a direct view of the moderator, which do not use a bender to help mitigate the fast neutron background, are the most challenging. For these beam lines we propose the innovative shielding of placing blocks of material directly into the guide system, which allow a minimum attenuation of the cold and thermal fluxes relative to the background suppression. This shielding configuration has been worked into a beam line model using Geant4. We study particularly the advantages of single crystal sapphire and silicon blocks.

引用

页码：135 / 144

页数：10