An acceptance diagram analysis of the contaminant pulse removal problem with direct geometry neutron chopper spectrometers

被引：13

作者：

Copley, JRD ^{[1
]}

机构：

[1] Natl Inst Stand & Technol, Ctr Neutron Res, Gaithersburg, MD 20899 USA

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2003年 / 510卷 / 03期

关键词：

neutron scattering; time-of-flight; neutron choppers; acceptance diagrams;

D O I：

10.1016/S0168-9002(03)01731-5

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

Phased choppers are used to produce pulsed beams of monochromatic neutrons at research reactors and spallation neutron sources. Depending on the design of the instrument, it is very possible that the choppers will transmit neutrons with wavelengths other than those within the desired band of wavelengths. One or more additional choppers are typically needed to remove these contaminant pulses. We describe a method of determining the wavelength- and time-dependent transmission of a system of choppers using acceptance diagrams. The method is illustrated with calculations for the Disk Chopper Spectrometer at the NIST Center for Neutron Research and the proposed Cold Neutron Chopper Spectrometer at the Spallation Neutron Source (Oak Ridge, TN). (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：318 / 324

页数：7

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