[en] The 18 toroidal field coils of the JT-60SA are mechanically linked by the so called 'Outer Inter-coil Structure' (OIS). Each OIS is bolted to its neighbors by five splice plates: this presents the double advantage of facilitating the assembly of the structure as well as ensuring an efficient electrical insulation by the insertion of an epoxy-glass sheet between the clamping stainless steel parts. Since strong electromagnetic loads are carried by these OIS, the bolting requires a high preload to provide a significant contact pressure and thus prevent the slippage of the splice plates. We identified some critical issues that are associated with this bolted joint: the sliding behavior at the cryogenic temperature, the risk of creep of the epoxy-glass spacers during the long period of the assembly phase, and the high stress levels developed in the bolting. In this paper, we present the results of the qualification tests for several components of the fastening parts of the OIS. Two mockups of the connection were tested at room temperature and at 4 K to measure the sliding coefficient between the stainless steel and the glass-epoxy faying surfaces. The loss of preload in the bolts due to the hydraulic tightening process has also been measured on different scaled mockups. The effectiveness of the titanium washers used to compensate the loss of preload due to the difference in the thermal shrinkage between the steel and the glass-epoxy components has also been validated. Finally, the creep behavior of the insulation has been investigated by testing the glass-epoxy samples on a specially designed testing device. (authors)

[en] The 18 D-shaped Nb-Ti toroidal field (TF) coils for the JT-60SA tokamak will each be 7 m high and 4.5 m wide. Together they will generate an on-axis field of 2.25 T. All the main contracts for their manufacture are now in place, with manufacturing split primarily between sites in Japan (superconducting strand), Italy (conductor cabling and jacketing, casings fabrication and coil winding, and integration), and France (support structures, coil winding and integration, and final coil cold testing). This paper will summarize the key aspects of the design of the coils and the current status of manufacture on each area of the manufacture of the TF coils. A simple overview of the overall schedule for their completion is included. (authors)

[en] The R³B-Glad superconducting Magnet is a large acceptance dipole, dedicated to the analysis of Reactions with Relativistic Radioactive ions Beams. It takes part in the FAIR Project at GSI. As the superconducting NbTi Rutherford cable was under production, detailed studies of the mechanical structure (with both simulation and experiment on a half-scale mock-up) led to revise the magnet design and to abandon the grading of the coils in three stages. Due to the large magnetic forces (up to 400 tons/m), the maximum shear stress level of 20 MPa was impossible to meet in the coils. The main reasons consist in the orthotropic thermo-mechanical behavior of the coils together with the large differential thermal shrinkage between the Cu stabilized coils and their Al alloy casings. Indeed after several studies of different mechanical designs, we decided to simplify the magnet in order to cope with these difficulties. One innovative point is that the coils are not blocked at room temperature, but only at 4.5 K. This paper presents the magnetic calculations of this active shielded magnet, and shows how the new design features meet the specifications. Currently, the 22 tons magnet cold mass, i.e. the 6 coils and their integration in the casings, is ordered and under construction. Meanwhile, the design of the magnet cryostat has evolved into a shape of elliptical cylinder with a lateral satellite. The total weight is expected to be around 50 tons. (authors)

[en] Full text: In 2005, when the ITER site decision was made, the French Government decided to participate in the joint Europe-Japan implementation of the so-call “Broader Approach Activities” (BA) in support of the ITER project and DEMO activities. The BA comprises the ITER Satellite Tokamak Programme (STP) which consists in upgrading the JT-60U machine into the largest fully superconducting and actively cooled D shaped tokamak JT-60SA before ITER, and in the participation to its scientific exploitation. As collaboration with Fusion for Energy (F4E), the French commitments, in charge of CEA as voluntary contributor (VC), are described in the Agreement of Collaboration (AoC). The CEA contribution related to the toroidal field coil (TFC) procurement is 9+1 spare of the 18+2 spares TFCs, the whole supporting structures, the TFC cold test facility (CTF) and the TFC preassembly. The complementary contribution is in charge of Italy. After the preparation and qualification phases, in these last two years, the industrial production for the procurement of the French contribution to the toroidal field coil manufacture is now well engaged. The first coils were wound and integrated into their casings. The first mechanical structures were produced. These coils were sent to the cold test facility and cold tested for final acceptance before to be assembled with their outer intercoil structures in a dedicated workstation. These assemblies are the first components of the TF magnet which were sent to JAEA. In parallel the following TFC production, qualification and preassembly are ongoing. (author)

[en] Ground-based gamma-ray astronomy has had a major breakthrough with the impressive results obtained using systems of imaging atmospheric Cherenkov telescopes. Ground-based gamma-ray astronomy has a huge potential in astrophysics, particle physics and cosmology. CTA is an international initiative to build the next generation instrument, with a factor of 5-10 improvement in sensitivity in the 100 GeV-10 TeV range and the extension to energies well below 100 GeV and above 100 TeV. CTA will consist of two arrays (one in the north, one in the south) for full sky coverage and will be operated as open observatory. The design of CTA is based on currently available technology. This document reports on the status and presents the major design concepts of CTA. (authors)