KWS-1 high-resolution small-angle neutron scattering instrument at JCNS: current state

Abstract

The KWS‐1 small‐angle neutron scattering (SANS) instrument operated by the Jülich Centre for Neutron Science (JCNS) at the research reactor FRM II of the Heinz Maier‐Leibnitz Zentrum in Garching near Munich has been recently upgraded. The KWS‐1 instrument was updated, from its active collimation apertures to the detector cabling. Most of the parts of the instrument were installed for the first time, including a broadband polarizer, a large‐cross‐section radio‐frequency spin flipper, a chopper and neutron lenses. A custom‐designed hexapod in the sample position allows heavy loads and precise sample positioning in the beam for conventional SANS experiments as well as for grazing‐incidence SANS under applied magnetic field. With the foreseen in situ polarization analysis the main scientific topic of the instrument tends towards magnetism. The performance of the polarizer and flipper was checked with a polarized 3He cell at the sample position. The results of these checks and a comparison of test measurements on a ferrofluid in a magnetic field with polarized and nonpolarized neutrons are presented.

Interactions between shape-persistent macromolecules as probed by AFM

“…SANS data (KWS-1, JCNS at Heinz Maier-Leibnitz Zentrum [56]) for a polymer concentration range from 0.005 to 0.03 g/cm 3 are presented in Fig. 5.…”

Ionic Dependence of Gelatin Hydrogel Architecture Explored Using Small and Very Small Angle Neutron Scattering Technique

“…SANS and VSANS experiments were carried out at, respectively, the KWS‐1 and KWS‐3 diffractometers operated by the Jülich Centre for Neutron Science (JCNS) at the Heinz Maier‐Leibnitz Zentrum in Garching, Germany. Four configurations were used at KWS‐1, namely the sample‐to‐detector distances of 1.3, 2, 8, and 20 m, the collimation length of 8 and 20 m, and wavelength of 7 Å (Δ λ/λ = 10%).…”

“…Hydrogels were filled into rectangular quartz cells with path length of 1 or 2 mm. Plexiglas was used as a secondary standard to calibrate the scattering intensity in absolute units at KWS‐1 and the direct beam method was used at KWS‐3 . The data correction and calibration were performed using the software QtiKWS .…”

Nanocomposites composed of HEUR polymer and magnetite iron oxide nanoparticles: Structure and magnetic response of the hydrogel and dried state

“…Small angle neutron scattering (SANS) measurements on the nanocomposite systems in the dried and in the hydrogel states were performed on the SANS diffractometer KWS-1 at JCNS in Garching [16]. The scattering patterns were recorded in the range of the scattering vector Q between 0.0017 and 0.22 Å À1 using a neutron wavelength of 4.7 Å (±5%).…”