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Institute of High Energy Physics ,CAS

Contact: Li Lin

Phone: +86 769-38944014-351

Email: lilin@ihep.ac.cn

Equipment

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  multipurpose reflectometer (MR)

        The multipurpose reflectometer (MR) is designed to examine (solid) thin films and superlattices, especially in regard to their magnetic properties. The sample has been put vertically to allow more convenient operation of the instrument. The minimum sample size is 10 x 10 mm. The following is the specifications of MR. The neutron flux at sample position is about 107n/cm2s. Detector size is 200 x 200 mm2 and the resolution is 2 x 2 mm. Q range is 0.005-0.4 Å-1. The minimum reflectivity can reach 10-6. With the polarized neuron beam, the structural and magnetic depth profiles of thin film structures can be analyzed. MR provides user for the general neutron reflectivity measurement, including the measurements of (1) specular reflection, (2) polarized specular reflection, and (3) grazing incidence small angle scattering. (4) Besides the conventional capability of a neutron reflectometer, complementary diffraction experiments, with the highest scattering angle 2up to 130 deg, are feasible. Research using the MR is primarily focused on studies of materials with a net magnetization, which can be perturbed by many environmental variables, including magnetic, electric fields, and temperature. The maximum magnetic field is 1 T for temperature dependence (5-750K) measurements and 2T for room temperature measurements. Moreover, the study of reflection from vertical solid or solid/liquid interfaces are also available.

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  CSNS Small-Angle Neutron Spectrometer (SANS)

        The CSNS Small-Angle Neutron Spectrometer (SANS) is the first pulsed-source general-purpose time-of-flight user instrument for small-angle neutron scattering experiments in China. The CSNS SANS utilizes beam port #1 of the CSNS target station facing a coupled hydrogen moderator and adopts a short straight beamline configuration with the classic point-focusing pin-hole camera geometry. The instrument consists of pre-sample collimation in segments, a set of one T0 chopper blocking prompt-strike fast neutrons and one double-disk band-width selection chopper, one frame-overlapping mirror removing long wavelength background neutrons, a set of three beam apertures shaping the incident beam size, a set of three beam monitors, the main detector with 120 Ø8 mm diameter 1m length 3He Neutron Linear Position Sensitive Detector tubes and the vacuum scattering vessel housing the detector array. The performance estimates of the CSNS SANS for user program baseline operations are expected as 10^6 n/cm^2/s neutron flux at sample position, 0.5~12Å working wavelength and 0.01~1Å momentum transfer. Typical sample size for the CSNS SANS experiments is Ø6~12mm large and 1~2mm thick with nanoparticles under study of the length scale 1~100 nm.

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  general purpose powder diffractometer (GPPD)

        The general purpose powder diffractometer (GPPD) is one of the three day-one instruments at the China Spallation Neutron Source (CSNS). It is designed to be a flexible and versatile instrument for a wide range study of crystallographic and magnetic structures. The best resolution will be better than 0.2% at high angle detector bank. Scientific studies at this instrument encompass a wide range of novel materials. These include, but are not limited to, structural studies of magnetic materials such as high-Tc superconductors, metal-insulator phase transitions, charge and orbital ordering transitions, and molecular magnets; metals and semiconductors; dielectrics, ferroelectrics, and thermoelectrics; ab initio structure solutions of polycrystalline materials; the electrochemistry of catalysts, ceramic membranes, hydrogen storage materials, and charging and discharging of battery materials.

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