The JET gamma-ray camera diagnostics have already provided valuable information on the gamma-ray imaging of fast ion in JET plasmas. The applicability of gamma-ray imaging to high performance deuterium and deuterium-tritium JET discharges is strongly dependent on the fulfilment of rather strict requirements for the characterisation of the neutron and gamma-ray radiation fields. These requirements have to be satisfied within very stringent boundary

Commercial wires of Nb3Sn and MgB2 were inspected through X-ray cone-beam micro-tomography (μCT). Details of the architecture of the wires of different topologies were visualized. In the case of MgB2 wires this allowed to compare the geometrical perfection of the component elements between the wires with 18 and 7 superconducting sub-elements heat treated for different conditions. Defects such as 3D voids and interruption of the diffusion barriers

This paper presents recent results on fast ion studies on JET. A set of diagnostics for both confined and lost fast ions was employed for investigating the response of fast ions to MHD modes and for studying their behaviour in plasmas with toroidal field ripple and in shear-reversed plasmas. A dependence of the losses on MHD mode amplitude was deduced from the experimental data. Astudy of various plasma scenarios has shown that a significant redistribution

The JET neutron profile monitor coverage of the neutron/gamma emissive region enables tomographic reconstruction. However, due to the availability of only two projection angles and to the coarse sampling, tomography is a highly limited data set problem. A comparative study concerning the applicability to JET tomography of four methods—maximum likelihood, maximum entropy, Tikhonov regularization and a Monte Carlo back-projection algorithm—is reported.

An inspection procedure to assess the mechanical integrity of IFMIF capsules and rigs during the irradiation campaign is necessary. In a number of experiments, we previously proved that X-ray tomography is a reliable solution for official inspections of the structural integrity of IFMIF complete assemblies before and after various tests (tensile, creep-fatigue, fracture toughness, crack growth, microstructure swelling). The next main challenge is

The main aim of the JETKN3gamma-ray cameras upgrade is the design of appropriate neutron/gamma-ray filters (“neutron attenuators”). Using the attenuation factor as the main design parameter a set of three neutron attenuators of different shape and attenuation length have been designed for the horizontal and vertical cameras. Pure light water was chosen as the attenuating material for the JET gamma-ray cameras. The operation of the KN3 neutron

It is shown that x-ray microtomography (XRT) is a powerful technique to observe on extended volumes the morphology, alignment and local bulk density in MgB2 tapes, thin films and especially bulk specimens. For the bulk samples obtained from mechanically milled powders for different conditions, several types of the 3D microstructural patterns were observed. These significant differences between the samples were not revealed by SEM. Microtomography

The JET neutron profile monitor ensures coverage of the neutron emissive region that enables tomographic reconstruction. However, due to the availability of only two projection angles and to the coarse sampling, tomography is a limited data set problem. A reconstruction method based on the maximum likelihood principle is developed for solving the reconstruction problem. A smoothing operator, defined as median filtering which uses a sliding window

The potential of X-ray micro-tomography in characterizing the relevant material issues as identified during manufacturing processes was investigated. For this purpose, the 3D X-ray micro-tomography (XRmT) analysis was applied to the characterization of structural integrity of Nb3Sn superconducting wires of differing topology and the evolution of the density distribution of ceramic samples manufactured by Field Assisted Sintering Techniques (FAST).

Recently, MgB2 was discovered to be a superconductor with a surprisingly high critical temperature of about 39 K and with significant potential for applications. This material is usually prepared from a mixture of Mg and B in sealed tubes with excess Mg. As-prepared samples usually are very porous and mechanically weak. High density superconducting samples of MgB2 undoped and doped with SiC and B4C were produced by Field Assisted Sintering Technique