AMOR – the time-of-flight neutron reflectometer at SINQ/PSI

Pramana

J Stahn¹  P Keller¹  T Gutberlet1¹  Mukul Gupta1¹  D Clemens1¹ 

[1] Laboratory for Neutron Scattering, ETHZ & PSI, Paul Scherrer Institute, Villigen, CH-5232, Switzerland$$

关键词: Apparatus for multioptional reflectometry;    neutron reflectivity;    neutron reflectometer;    time-of-flight;    polarized neutrons;    liquid interfaces.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

The apparatus for multioptional reflectometry (AMOR) at SINQ/PSI is a versatile reflectometer operational in the time-of-flight (TOF) mode (in a wavelength range of 0.15 nm > 𝜆 > 1.3 nm) as well as in the monochromatic (𝜃 - 2𝜃) mode with both polarized and unpolarized neutrons. AMOR is designed to perform reflectometry measurements in horizontal sample-plane geometry which allows studying both solid–liquid and liquid–liquid interfaces. A pulsed cold neutron beam from the end position of the neutron guide is produced by a dual-chopper system (side-by-side) having two windows at 180° and rotatable with a maximum frequency of 200 Hz. In the TOF mode, the chopper frequency, width of the gating window and the chopper–detector distance can be selected independently providing a wide range of 𝑞-resolution (𝛥 𝑞/𝑞 = 1–10%). Remanent FeCoV/Ti : N supermirrors are used as polarizer/analyzer with a polarization efficiency of ∼ 97%. For the monochromatic wavelength mode, a Ni/Ti multilayer is used as a monochromator, giving ∼ 50% reflectivity at a wavelength of 0.47 nm. In the present work, a detailed description of the instrument and setting-up of the polarization option is described. Results from some of the recent studies with polarized neutrons and measurements on liquid surfaces are presented.

【 授权许可】

Unknown