Sensors, characterization and diagnostic technologies

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Structural, Mechanical and Physical Properties Characterization facility for High Performance Materials

National Centre for Scientific Research “Demokritos” gained extensive know-how and capabilities on multi-purpose characterization of high-performance materials for extreme environments supporting material optimization in the intended application and overall performance improvement. The facilities and know-how have been generated for the characterization and development of fusion structural, high heat flux and functional materials, allowing for dozens of material properties to be accurately determined. Thanks to these remarkable performances, preliminary applications for materials used in aerospace applications have already been found. Material characterization in conjunction with know-how for innovative material development and material testing capabilities are now available for further use in applications where materials are exposed to extreme environments, like Nuclear, Aerospace, Energy systems, Automotive, Marine and Defence sectors.


Investigating radiation damage in materials using ion beam

Considering the evolution of microstructures and material properties under extreme radiation conditions, the JANNuS facility has been developed at University Paris-Saclay that allow multi-scale modelling of radiation effects in materials with in situ observations of microstructure modifications. The versatility of conditions in terms of particle energy, dose rate, fluence, etc., is a key asset of ion beams allowing fully instrumented analytical studies. Coupling of two or more beams, use of heated/cooled sample holders, and implementation of in situ characterization and microscopy pave the way to real time observation of microstructural and property evolution in various extreme radiation conditions more closely mimicking the nuclearenvironments.
Many promising applications in electronics, space, geologyare considered.


Optimum grating parameters  for a VUV  (vacuum  ultraviolet)  spectrometer

The  object  of  the  invention  is  to  provide manufacturing parameters for a  holographic  diffraction  grating  on  a  concave  or  toroidal  surface,  which  is used as the single optical element in a VUV spectrometer with a flat detector. The spectrometer geometry is also defined alongside the diffraction grating parameters. The invention from the research center Juelich (Germany) consists of a proprietary software  code  which  uses  various  numerical  methods  to  determine  the  optimal  grating parameters, with the aim of producing such gratings for VUV spectrometers with  a  minimal  line  width  for  a  pre-­‐defined  wavelength  and  at  the  same  time  achieving high spectrometer efficiencies.


Ultra Sniffer New leak detection  method

The test sensitivity of classic sniffer test methods  is  limited  by  the  helium  concentration  in  the  air,  but  by  reducing  the  atmospheric helium concentration the test sensitivity can be significantly improved. The Ultra Sniffer Test gas (UST) method is simple – there is no evacuation of the test chamber, only a filling with helium free gas. The method has successfully been used for testing super conducting coils for Wendelstein 7-­‐X at the Max Planck Institute for Plasma Physics (IPP) in Greifswald. The technology is ready for use in the non-­‐fusion domain  and  is  currently  being  commercialized  by  the  inventor,  Mr.  Robert  Brockmann.


MANTIS: a real-time quantitative multispectral imaging system

MANTIS is a multispectral imagining system, based on a new diagnostic technique recently developed in a collaboration between MIT-PSFC, EPFL, and DIFFER and used to monitor the discharges in the fusion experiment (TCV’s system and MAST-U). The MANTIS system collects light through a single window in the tokamak and feeds it to ten cameras that each look at a very narrow wavelength band. MANTIS can analyse density, temperature and the presence of impurities in real time with accuracy. Outside fusion applications, Tthis technology makes it possible to detect also medical impurities in the human body (as cancer) or impurities in materials.


CeBr Scintillators

Technology, know-­‐how, and expertise have been developed by a world-­‐renowned nuclear fusion organization within the field of CeBr (Cerium Bromide) Scintillators. These scintillators have been characterized to have a fast response time of less than 20ns and the energy resolution at 511keV is about 4%. Previously, conventional gamma ray detectors have been unsatisfactory in their time resolution, limiting their applications in medical PET scanners and material science measurements.


Diamond Detector Matrix

A 12-­‐pixels diamond based neutron spectrometer matrix has been built in a collaboration between the  two  CNR  institutes  IFP  (Institute  of  Plasma Physics,  Milan)  and  ISM  (Institute  of  the  Structure  of  Matter,  Rome).  The  spectrometer is equipped with fast electronics and digital acquisition, which for the first  time  allows  combined  fast  neutron  spectroscopy  (>1  MeV)  with  good  energy  resolution (<3% at 14 MeV) and high count-­‐rate capability in excess of 1 MHz.


Axial Potential Separator suitable for Cryotechnics

The technology innovation is a new electrical potential separator for cryotechnics. It is applicable particularly to electrically isolating areas, in which different potentials occur. The device consists of a dielectric tube e.g. made of polyimide, which still isolates when subjected to low temperatures as a result of its material properties. An annular groove is located on the exterior of both end areas of the tube, in which a support ring is inlaid. Electrodes are applied to the tube such that they cannot be removed. The electrodes themselves are detachably connected to flanges that are pulled onto the face of the tube to seal the device. The technology is ready for use in the non‐fusion domain and was patented by the inventors Stefan Fink and Günter Friesinger


Neutron-insensitive silicon ion detectors for NPA (Neutral Particle Analysis)

A leading European nuclear fusion institute has developed a thin silicon strip detector for 10‐1000 keV ions. The detector consists of an active silicon layer (5 µm thick for low‐energy ions, or 25 µm thick for detection of high-­‐energy ions) bonded to a silicon support (~300 µm thick). Unlike previous ion detectors, the thin silicon strip detector exhibits high background‐to­‐signal separation and good radiation tolerance, so is effective in high gamma, neutron, or photon backgrounds. The detector works by converting ion energy directly to charge in the silicon.

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