40 kA Superconducting DC Transformer for the FRESCA test station

This note presents the superconducting transformer that is now operated on the FRESCA test station. It is divided in two parts: part 1 from page 1 to 30 is the note itself, part 2 from page 31 to the end is annexes. After an introduction of the objectives and functioning of the superconducting transformer, the note describes the sample insert that holds the transformer, its current regulation system ant its protection system. The conclusion finally gives the performances of the transformer (cryogenic aspects as well as measurement accuracy)

Preliminary Magnetic Designs for Large-Bore and High-Field Dipole Magnets

This report presents the results of calculations - magnetic, forces, conductor losses - for dipole magnets having bores of 88, 130, 160 mm. The calculations are made for two types of dipole design: a layer design and a slot design. The aim of these calculations was to define the characteristics of a Nb$_{3}$Sn strand suitable to reach dipolar field in the range 13 to 15 T. This report constitutes a deliverable for the NED Joint Research Activity within the CARE Program

Superconducting coil configurations, with low flux leakage, for energy storage

This paper presents two original types of SMES structures for energy storage. These two groups of SMES structures proceeded from an ideal structure: the full toroid, are modeled by the use of purely surface current densities. Their main advantage is to present no flux leakage, they give then satisfactory solution to the problem of energy storage

Micro-gravity: Superconducting coils for crystal growth. Influence of the levitation force on natural convection in the fluid

This paper presents a novel design of superconducting coils able to generate a micro-gravity environment for protein crystal growth in aqueous solution. The structures have been calculated thanks to a method for “inverse source synthesis problem” developed at the GREEN Choice of the angular offset between the directions of magnetic force field and magnetic field in the working area as well as convection phenomena are also studied

Micro-gravity: current distributions creating a uniform force field

This paper presents two structures of superconducting coils able to give satisfactory solutions to the problem of generation of uniform field of high magnetic forces. The first structure is modeled by the use of purely surface current densities, whereas the second one can be described with volume current densities. Both of these structures proceed from the study of a particular expression of the complex magnetic potential introduced for structures with two-dimensional geometry. This work is carried out in a research collaboration between the GREEN and the DSM-DAPNIA department of the CEA Saclay

Western Blood in an Eastern Island: Affective Identities in Timor-Leste

The LHC magnet R&D program has shown that the limit of NbTi technology at 1.9 K was in the 10-to-10.5-T range. Hence, to go beyond the 10-T threshold, it is necessary to change the superconducting material. Given the state of the art in HTS, the only serious candidate is Nb 3 Sn. A series of dipole magnet models built at Twente University and LBNL as well as a vigorous program carried out at Fermilab have demonstrated the feasibility of Nb 3 Sn magnet technology. The next step is to bring this technology to maturity, which require further conductor and conductor insulation development and a simplification of manufacturing processes. After a brief history, we review ongoing R&D programs in Europe and we present the Next European Dipole (NED) initiative promoted by the European Steering Group on Accelerator R&D (ESGARD)

Status of the Next European Dipole (NED) Activity of the Collaborated Accelerator Research in Europe (CARE) Project

Plans for LHC upgrade and for the final focalization of linear colliders call for large aperture and/or high-performance dipole and quadrupole magnets that may be beyond the reach of conventional NbTi magnet technology. The Next European Dipole (NED) activity was launched on January 1st, 2004 to promote the development of high-performance, Nb$_{3}$Sn wires in collaboration with European industry (aiming at a non-copper critical current density of 1500 A/mm2 at 4.2 K and 15 T) and to assess the suitability of Nb$_{3}$Sn technology to the next generation of accelerator magnets (aiming at an aperture of 88 mm and a conductor peak field of 15 T). It is integrated within the Collaborated Accelerator Research in Europe (CARE) project, involves seven collaborators, and is partly funded by the European Union. We present here an overview of the NED activity and we report on the status of the various work packages it encompasses