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Genova, Italy

Pesenti P.,ASG Superconductors | Guerra A.,TTM Tube Technology Machinery | Baccarini P.,Istituto Italiano della Saldatura | Oliva A.B.,Fusion for Energy F4E | Harrison R.,Fusion for Energy F4E
Rivista Italiana della Saldatura | Year: 2014

The ITER experimental nuclear fusion reactor contains within 18 superconducting toroidal coils for the confinement of high temperature plasma. Each of them is composed by 7 double-layer windings inserted in AISI 316LN stainless steel plates with grooves on both sides, named radial plates. The manufacturing process of a toroidal coil includes the insertion of the superconductive winding inside the radial plate grooves, its electrical insulation, the closing with steel covers of the radial plate grooves, a first vacuum impregnation of the winding, the subsequent stacking and the simultaneous impregnation of the 7 windings. The purpose of this article is to illustrate the fully automated system designed for laser welding between the covers and the radial plates. The welds have very stringent requirements in terms of penetration control, due to the presence of the superconductor and insulation and, in terms of geometry, considering the coupling tolerances required on the windings that form the coil. The dimensions of the radial plate, with its D shape of 14 × 9m, require about 1500 m of laser welding for the covers assembly. The stages of R&D have developed a laser process with filler wire addiction, the automation of the scanning of the variable gaps between covers and radial plate, the generation and control of robot trajectories, the total automatization of the plant. For the plant control bi-dimensional laser triangulation sensors have been adopted, for the detection and measurement of very close gaps (< 0.1 mm ), real-time controller for analysis and signal processing, fiber laser sources with power up to 3 kW. The whole process is monitored by vision systems with coaxial welding heads that allow accurate visual analysis of the weld pool. Source


Fabbricatore P.,National Institute of Nuclear Physics, Italy | Alessandria F.,National Institute of Nuclear Physics, Italy | Bellomo G.,National Institute of Nuclear Physics, Italy | Bellomo G.,University of Milan | And 6 more authors.
IEEE Transactions on Applied Superconductivity | Year: 2011

The Facility for Anti-proton and Ion Research (FAIR), under development at GSI, includes the synchrotron SIS300, so called because the magnetic rigidity is 300 Tm. In order to reach the required high intensities of proton and heavy ions beams, the bending dipole magnets have to be pulsed from the injection magnetic field of 1.5 T up to 4.5 T maximum field at the rate of 1 T/s. These 7.8 m long magnets have cos Θ shaped coils with a 100 mm bore and the particular characteristic to be geometrically curved, with a sagitta of 112.9 mm. These challenging requirements triggered R&D activities, aimed at the development of suitable construction technologies for fast ramped curved coils. The heart of the R&D program is the construction of a 3.9 m long model. The paper discusses the main problems faced during the design and the construction of the cold mass, mainly covering the aspects related to the manufacture. © 2010 IEEE. Source


Morandi A.,University of Bologna | Brisigotti S.,Columbus Superconductors | Grasso G.,Columbus Superconductors | Marabotto R.,ASG Superconductors
IEEE Transactions on Applied Superconductivity | Year: 2013

The feasibility of a conduction-cooled MgB2 -based superconducting fault-current limiter with fast recovery is investigated. A real-scale device for a distribution network is considered. The dc resistive configuration is chosen in order to avoid ac losses and to allow conduction cooling. A high-heat-capacity cable is specifically developed in order to cope with the requirement of fast recovery. A short-length sample of the cable is manufactured in order to assess its feasibility. The detailed design of a prototype is also carried out, and the performance is numerically investigated. © 2002-2011 IEEE. Source


Fabbricatore P.,National Institute of Nuclear Physics, Italy | Alessandria F.,National Institute of Nuclear Physics, Italy | Bellomo G.,National Institute of Nuclear Physics, Italy | Bellomo G.,University of Milan | And 8 more authors.
IEEE Transactions on Applied Superconductivity | Year: 2013

The synchrotron SIS300 is a fundamental component of the FAIR facility under construction at the GSI laboratory in Darmstadt. The acceleration of high intensity proton and heavy ion beams requires 4.5 T magnets, up to 7.8 m long, to be ramped up at a rate of 1 T/s. These challenging magnets have also the particular characteristic to be geometrically curved with a sagitta of 114 mm. To demonstrate the feasibility of curved fast cycled cos-theta dipoles, R&D activities were performed at the Italian National Institute of Nuclear Physics. Important steps of the R&D have been: 1) the development of a low loss superconducting Rutherford cable; 2) the construction of coil winding models for assessing the constructive feasibility of curved coils; and 3) the construction and tests of a complete model magnet composed of a cold mass enclosed in its horizontal cryostat. During 2012 the cold mass was tested at Italian National Institute of Nuclear Physics-LASA in a vertical cryostat. The paper discusses the main issues of the R&D activity from design to manufacture, results, future developments, and future perspectives. © 2002-2011 IEEE. Source


Bosi F.,National Institute of Nuclear Physics, Italy | Fabbricatore P.,National Institute of Nuclear Physics, Italy | Farinon S.,National Institute of Nuclear Physics, Italy | Gambardella U.,National Institute of Nuclear Physics, Italy | And 4 more authors.
IEEE Transactions on Applied Superconductivity | Year: 2013

Recent developments in the high luminosity e+e? colliders are based on a collision scheme with a large Piwinski angle, a vertical beta function ?y much smaller than the bunch length, and a crab waist transformation. This scheme is being adopted in the SuperB asymmetric collider, to be built in Italy, with a design peak luminosity of 1036 cm?2 sec?1. A crucial role is played by the quadrupole doublets QD0/QF1, which are placed close to the interaction point and generate gradients close to 100 T/m. The available space for the doublets is very small, causing themagnets to be operated with a high engineering current density (2000 A/mm2). Starting from the helical coil concept, an advanced design of the quadrupole has been developed. The paper discusses the basic design concepts and the development of a coil model aimed at assessing the design criteria and demonstrating the feasibility of the quadrupole. The successful test of the coil model opens the way to new compact superconducting high gradient quadrupole magnets for the interaction regions of high luminosity colliders. © 2002-2011 IEEE. Source

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