New hydrogen supply system to cold moderator for the SANS and reflectometer (FREYJA) instruments

A new hydrogen supply and liquefaction system has now been installed in connection with the cold moderator setup at NcNeutron. The cold moderator supplies long wavelength neutrons to two NcNeutron instruments, the SANS apparatus as well as the upcoming neutron reflectometry instrument. The access to cold neutrons is essential for the study of mesoscale structures using these techniques.

 

Final design of FREYJA in the standard mode of operation

FREYJA is currently under construction and will be in operation by the end of 2020. The instrument is a typical Time-of-flight (TOF) neutron reflectometer with vertical sample surface. It will be possible to measure a variety of interfaces except for free liquids. Typical science cases for FREYJA will be the study of energy materials e.g. hydrogen in metals, battery materials, electrodes and corrosion in metals. In the area of soft matter science, it will be possible to study e.g. polymer mixtures and artificial membranes. FREYJA is designed in a modular way and will also allow the use of polarized neutrons for the investigation of magnetic thin films and interfaces. The detailed design of the instrument is finished now and major instrument components such as disk choppers, sample stack, neutron optics and a position-sensitive 10B-multi-blade detector (collaboration with ESS detector group) have been ordered or are under development.

 

New in-pile collimator and filters installed for NIMRA

       

As part of the upgrade of the neutron radiography station and building of NIMRA, a new in-pile collimator has been installed. The new collimator consists of a 20 mm diameter aperture and a series of hollow steel cylinders with increasing internal diameter, which are optimized for delivering neutrons to the new sample position in NIMRA. A sapphire filter and a bismuth filter have been also installed in the beam channel between the in-pile collimator and the reactor tank. Sapphire and bismuth should reduce the flux of fast neutrons and gamma radiation, respectively. All other major components for NIMRA are currently being ordered and/or delivered. They will be installed during the summer of 2019. NIMRA is planned to be in operation from the start of 2020.

 

NEST – a neutron stain scanner

The project to build the neutron strain scanner NEST has now entered the design phase. NEST will be used to measure strain in solid materials from processes like welding, machining, casting, extrusion or 3D-printing. The high penetration depth of neutron in most materials makes it possible to measure strain non-destructively in the bulk of large samples. The first critical design parameters to decide, are the maximum physical dimensions and weight of the samples that NEST will be able to handle. Discussions with national user groups are on-going.