Final Design of the New Grenoble Hybrid Magnet

Abstract

A CEA-CNRS French collaboration is currently developing a new hybrid magnet; this magnet combines a resistive insert composed of Bitter and polyhelix coils and a new large bore superconductor outsert to create an overall continuous magnetic field of 42+ T in a 34 mm warm aperture. The design of the superconducting coil outsert has been completed after thorough studies and successful experimental validation phases. Based on the novel development of a Nb-Ti/Cu Rutherford Cable On Conduit Conductor (RCOCC) cooled down to 1.8 K by the mean of a bath of superfluid helium at atmospheric pressure, the superconducting coil aims to produce a continuous magnetic field of 8.5 T in a 1.1 m cold bore diameter. The main results of the final design studies of the superconducting coil are presented including the 2D and 3D mechanical stress analysis, the conductor and coil specifications, the coil protection system as well as the required cryogenics infrastructure. The final design of the resistive insert coils is also described.

Cryogenic Design of the 43 T LNCMI Grenoble Hybrid Magnet

“…The main parameters of the superconducting (SC) magnet are given in Table 2. [2]. As the length of the conductor for one double pancake is 240 m, the Gorter-Mellink regime through the 6 mm hole is not sufficient in our design.…”

“…The SC coil mass is 17 ton and the total cold mass is 22.4 ton. The most critical parts of the cryostat are the ECS and the cold mass support ferrules [2], [3].…”

“…In this exceptional situation the base plate must withstand heavy loads from the ECS (up to 4.5 MN), from the bore tube (up to 5.17 MN) and from the SC magnet support structure (up to 0.94 MN) [2], [3]. Finally, the design of our ferrules gives a relatively economic cryostat.…”

Characterization of YBCO Coated Conductors Under High Magnetic Field at LNCMI

“…Several sites are at disposal for applied superconductivity: two 50 mm diameter room temperature bores, one providing 25 T with 10 MW and the other 30 T with 20 MW, and a 160 mm diameter room temperature bore providing 20 T with 20 MW (27 T in a hybrid upgrade available in 2015 [6], [7]). Because of a high demand, access to 10 MW is easier than to 20 MW.…”

Study and Development of the Superconducting Conductor for the Grenoble Hybrid Magnet

“…Several hybrid magnets are being built all over the world [2], [3]. A general overview of the Grenoble project can be found in [4] and the final design of the large bore superconducting coil based on Nb-Ti and superfluid He technologies is reported in [5]. This article focuses on the studies and development of the superconducting conductor highlighting the new concept proposed.…”