Conceptual Design of the 45 T Hybrid Magnet at the Nijmegen High Field Magnet Laboratory

The Nijmegen High Field Magnet Laboratory (Nijmegen HFML) is developing a 45 T hybrid magnet consisting of a 12 T CICC superconducting outsert magnet and a 33 T Florida-Bitter resistive insert magnet. After a thorough review last year of the conceptual design of the superconducting outsert magnet in particular, the conductor and coil design for the outsert magnet have been adapted to create a larger performance margin so as to meet more adequately the possible uncertainties especially in CICC performance.Index Terms-Cable-in-conduit conductor, high field magnets, hybrid magnets, conductor.

Section: Introductionmentioning

confidence: 94%

Design of the Outsert Coil of the 45 T Hybrid Magnet at the Nijmegen High Field Magnet Laboratory

Ouden

Wiegers

Rook

et al. 2012

“…, the power loss density can be written as [9], [10]: (2) where is the twist pitch of the cable, , the width of the cable, and the field change rate in the direction perpendicular and parallel to the wide face of the cable respectively. All results obtained for the soldered face are consistent with .…”

Section: Loss Measurements and Tests Of The Dynamic Stability Of Tmentioning

confidence: 99%

“…The present state-of-the-art hybrid magnet system has been built by the NHMFL in Tallahassee, Florida, and has produced the highest DC magnetic field of 45.2 T in a 32 mm warm bore diameter [1]. 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].…”

Section: Introductionmentioning

confidence: 99%

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

Pugnat

Berriaud

Fazilleau

et al. 2012

To produce a continuous magnetic field of at least 8.5 T in a 1.1 m cold bore diameter, the superconducting outsert of the Grenoble Hybrid magnet is based on the novel development of a Nb-Ti/Cu Rutherford Cable On Conduit Conductor (RCOCC) cooled to 1.8 K by a bath of superfluid helium pressurized at atmospheric pressure. The main results of the conductor studies and development are presented after a brief introduction to the specificity of hybrid magnets, namely the electromagnetic couplings between resistive and superconducting coils. Results obtained with short samples of conductor are reviewed including the measurements of the elastic limit, AC losses, stability and critical current. The final specification of the RCOCC is presented highlighting the proposed method for the industrialization of the insertion process of the Rutherford cable on the hollow Cu-Ag stabilizer as well as its validation phase on short samples.

“…In the United States, the electric power for water-cooled resistive magnets is now strengthened from 32 to 56 MW, and in Europe, the high-magnetic-field generation of 42-45 T is also aimed by the power supply of 20-24 MW in France [2] and in the Netherlands [3]. Moreover, a 20 MW-40 T high-magnetic-field facility started to be built in China [4].…”

Section: Introductionmentioning

confidence: 99%

Hybrid Magnet Design Consisting of a 20 T Superconducting Outsert and a 15 MW Resistive Insert

Watanabe

Awaji

Oguro

et al. 2012

Internally reinforced strands with CuNb-reinforcing stabilizer have been developed for realizing a compact high-field superconducting magnet. The Rutherford flat cables composed of sixteen strands were made with a 0.8 mm diameter strand. The designed critical current of the Rutherford flat cable is at 13 T and 4.2 K in case of an ordinary heat-treatment at 670 for 96 h, which is two times higher than an operation current desired for safety margin.In addition, mechanical characteristics for CVD-processed (YBCO) coated-conductor tapes were measured at 4.2 K in fields up to 18 T. It was found that YBCO tape exhibits the irreversible strain 0.5% and the irreversible stress 1140 MPa for the critical current at 4.2 K and 18 T for . The cabling-and-react+prebending-processed Rutherford flat cables and CVD-processed YBCO tapes will be used as a react-and-wind method for the development of a 20 T superconducting magnet with a wide room temperature bore. We design a 20 T-440 mm warm-bore superconducting magnet consisting of YBCO inner coils, middle coils, and NbTi outer coils, which has the coil parameters of inner diameter 480 mm, outer diameter 1283 mm, and coil height 1302 mm. Since the coil inductance is estimated to be 232 H, the magnetic stored energy is 94 MJ at an operation current 900 A. An energy-saving 47 T hybrid magnet can be constructed in combination with a wide-bore 20 T superconducting outsert and a 15 MW-27 T water-cooled resistive insert.Index Terms-CuAg bitter plate, hybrid magnet, Rutherford flat cable, wide-bore superconducting magnet, YBCO insert coil.