The NSL BATAN located at Serpong nuclear area, 30km southwest of Jakarta. The laboratory is facilitated with four scattering instruments installed in the experi-mental hall of reactor (XHR) and three instruments are located in the neutron guide hall (NGH). Those two halls are connected by a tunnel accommodating two neutron guides (NG1 and NG2) transferring neutrons from the reactor to the in-struments in the neutron guide hall.
Those instruments are:

Residual stress measurement diffractometer, DN1

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This diffractometer has been used in-tensively for residual stress measure-ment of composite materials and al-loys. Various alloys such as high and low carbon steel, SUS 304, aluminium alloy, titanium alloy, nickel alloy, zir-colloy, magnesium alloy, copper alloy have been observed by DN1. These samples were prepared by different process i.e., welding, rolling, casting, forging, polishing as well as shot peen-ing.

In most cases, the measurement of lattice distance of the specimen were carried out by using theta-2theta scanning. Since scanning using point detector is time consuming, the improvement of the counting system using a multi channel ana-lyzer (MCA) equipped with 1-D detector is being prepared. This will reduce the data acquisition time significantly. The diffraction pattern is taken only by putting the 1D detector at certain position and neutrons diffracted from sample at a cer-tain angle range were counted simultaneously. The Labo system applied for con-trolling the motion of some components of the diffractometer will also be re-placed with a LabView based program as an alternative system for the VB-based on RESA's program.

 

Four-circle diffractometer/texture diffractometer, DN2

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The Four Circle Diffractometer/Texture diffractometer called DN2 was installed at the NG2-1 beam port sited in the XHR. This instru-ment was designed for crystal structural studies and texture measurements. To improve the performance of the DN2 diffractom-eter, a flight tube was added be-tween monochromator and sample

 

High-resolution powder diffractometer, DN3.

This diffractometer is located at the neutron guide (NG2-3) about 71 meter away from the reactor core. The monochromator drum has three exits corresponding to three take off angles, 2θM = 41.5°, 89° and 130°. At present the insrtrument, neutron has inherent magnetic mo-ment that enables probing the magnetic structure.

The High Resolution Powder Diffractometer (DN3) is a versatile diffractometer to study the crystallo-graphic and magnetic structure based on powder samples. As X-ray diffrac-tion is insensitive to light atoms such as hydrogen and oxygen, neutron dif-fraction is indispensable for materials containing light atoms. Furthermorent is set for 2θM = 89°. The hot pressed Ge(331) single crystal is used as monochromator result-ing the monochromatic wave length, λ =1.822 A .

There are three collimation systems: first collimator (α1=NG2), second collimator (α2=20’), and third collimation (α3=6’). The α2 and α3 collimators were made of gado-linium coated thin films. The detector system has 32 3He detectors covering 160 de-gree of scattering angle. This detector bank moves on air cushions to cover the 5 de-gree space in 100 steps. Ancillary equipment for this instrument are a furnace with maximum temperature of 1000 K, and a cryostat with closed cycle refrigerator down to 15 K.

 

Triple axis spectrometer, SN1.

Neutron triple-axis spectrometer, SN1 is installed at XHR. This instrument has been built to study inelastic scattering from condensed matters. SN1 is particu-larly used to investigate collective exci-tations either from the lattice (phonons) or from magnetically ordered system (magnons). Besides being used for ine-lastic scattering experiments, SN1 can also be used for elastic scattering experi-ments either with or without crystal an-alyzer. At present we are upgrading the instrumentation system of SN1 both of the hardware and the software.

 

Small angle neutron scattering spectrometer (SMARTer), SN2.

SMARTer, a 36 meter SANS spec-trometer is one of the largest SANS spectrometers in the South-east Asia, has been constructed at the end of the 49-meter long neutron guide (NG1) and situated in the neutron guide hall (NGH) to benefit from low background environment. A slot type mechanical velocity se-lector, type MDR-14-460-420 from Dornier having a minimum and maximum rotational speed of 700 and 7000rpm, respectively mono-chromatizes the incident beam.


The selector’s tilt angle now is fixed at 0° and it produces neutron wavelengths of 3 - 6 A covering effective scattering vector of 0.005 < Q < 0.5 A -1 relates to a size regime of 10 - 2500 A .

This spectrometer consists of an 18 m-long tube collimator system which compris-es four sections of movable guide-tubes and one section of fixed collimator (non-reflecting tube). Meanwhile, another 18-meter long tube accommodates a 128x128 3He two-dimensional position sensitive detector (2D-PSD) made by RISØ. The de-tector can be moved continuously from 1.3 m to 18 m from sample position and can also be shifted in the lateral direction by 0.1 m to increase the Q range. Variations of collimator length and sample-to-detector distance (SDD) are fully computer con-trolled. A schematic diagram of SMARTer 


Information from SANS Exploring the molecular morphology (structural properties-static) and dynamics in the relevant length scales, i.e. 1 – 500 nm of a wide range of substances such as al-loys, ceramics, polymers, liquid crystals, micellar solutions, microemulsions, colloid suspensions, and also biological materials, e.g. proteins, liposomes, lipids, DNA, vi-rus, etc. The information of average size and its distribution, spatial correlation, as well as shape, internal and hierarchical structures of nanomaterials can be re-vealed.

 

High-resolution small angle neutron scattering spectrometer, SN3.

The high resolution small angle neutron spectrometer is an instru-ment used for investigating the structure in the range of nano to micrometers. The instrument has one monochromator and two per-fect crystals. The PG (004) mono-chromator crystal mounted on the neutron guides (NG-2), 63 m away from the reactor core. Two Si (311) perfect crystals are installed on two separated goniometers.

These goniometers which provide rotation, translation and tilting movements are mounted on the two ends of an optical bench moving on air cushions. Three detec-tors of 3He are installed for alignment, monitoring and detecting the neutron beam. Samples with a maximum size of 30mm x 30mm are placed between the two Si (311) crystals whereas the whole system is installed in a thermostatic room to obtain sample temperature fluctuation within 0.5°C.

 

Neutron radiography facility , RN1.

Neutron Radiography Facility, RN1, has been installed at the beam tube S2 of the RSG GAS reactor at BATAN Serpong. One of the tangensial beam tube (beam tube S2) has been selected for neutron radiography. This facility is dedicated for non-destructive inspections of industrial materials. Figure 42 shows the photograph of the instrument while the schematic sideview of the RN1 is illustrated in figure 43.
The main components of the instruments are inner and outer collimators, main and auxiliary shutter and detector system.

Real Time Method
The Andor CCD camera has been used to observe a two-phase flow phenomena. A video images of two-phase flow were taken by using the real-time mode and visualization of the air-water two-phase flow in a metallic pipe was performed at the recording speeds of 300 frame per second. The bubbles and its moving behavior were clearly observed from the video images.