Material issues in the 100 T non-destructive magnet

Han, Ke; Baca, A.; Coe, H.; Embury, J.D.; Kihara, Kazuyoshi; Lesch, B.; Li, L.; Schillig, J.B.; Sims, J.R.; Sciver, Steven Van; Schneider-Muntau, H.J.

doi:10.1109/77.828468

Cited by 28 publications

(11 citation statements)

References 7 publications

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“…Copper-based conductive wires are very widely used, but mechanically stronger and still weakly resistive wires could find utility in aerospace and power engineering as well as in materials for the production of high-field pulsed magnets over about 100 Teslas. Classical strengthening methods involve the preparation of nano-grained copper (Cu) specimens [1], alloying with elements such as silver or niobium [2,3,4] or combining with a different phase or material [2,5]. However, the internal defects introduced by these methods, i.e.…”

Section: Introductionmentioning

confidence: 99%

Nanostructured 1% silver-copper composite wires with a high tensile strength and a high electrical conductivity

Tardieu

Mesguich

Lonjon

et al. 2019

Materials Science and Engineering: A

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High-strength, high-conductivity silver-copper composite wires were prepared by powder metallurgy, spark plasma sintering and room-temperature wire-drawing. Silver nanowires were mixed with a commercial micrometric copper powder (1, 5 and 10 vol.% silver). The powders were consolidated by spark plasma sintering in cylinders, which served as precursors for room temperature wire-drawing, producing samples of wires with progressively decreasing diameters. The Vickers microhardness for the wires is higher than that for the cylinders, reflecting both densification and grain refinement. Investigation of the microstructure reveals that the silver nanowires are located at the grain boundaries of ultrafine copper grains, elongated over several micrometers. The electrical resistivity and tensile strength were measured at 293 K and 77 K. The tensile strength is more than twice for the composite wires compared to the corresponding pure copper wires. Although higher tensile strengths are obtained using 5 vol.% Ag, the wires containing only 1 vol.% Ag offer the best combination of high strength (1100 ± 100 MPa at 77 K) and low electrical resistivity (0.50 µΩ.cm). The 1 vol.% Ag-Cu composite wires compare favorably with Ag-Cu alloy wires containing about 20 times more silver.

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Section: Introductionmentioning

confidence: 99%

Nanostructured 1% silver-copper composite wires with a high tensile strength and a high electrical conductivity

Tardieu

Mesguich

Lonjon

et al. 2019

Materials Science and Engineering: A

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“…Typically, it will not be necessary to warm up the outer coil set to replace the insert coil. Additional information on the insert coil and its materials may be found in [8], [9].…”

Section: B Insert Coilmentioning

confidence: 99%

“…This will be done to increase the voltage capability between magnet electrical sections. Additional information on the outer coil set, the materials to be used in its construction and the magnet busbar system may be found in other papers to be presented at this conference [9], [11].…”

Section: Outer Coil Setmentioning

confidence: 99%

First 100 T non-destructive magnet

Sims¹,

Baca²,

Boebinger

et al. 2000

IEEE Trans. Appl. Supercond.

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Abstract-The first 100 T non-destructive (100 T ND) magnet and power supplies as currently designed are described. This magnet will be installed as part of the user facility research equipment at the National High Magnetic Field Laboratory (NHMFL) Pulsed Field Facility at Los Alamos National Laboratory. The 100 T ND magnet will provide a 100 T pulsed field of 5 ms duration (above 90% of full field) in a 15 mm diameter bore once per hour. Magnet operation will be nondestructive. The magnet will consist of a controlled power outer coil set which produces a 47 T platform field in a 225 mm diameter bore. Located within the outer coil set will be a 220 mm outer diameter capacitor powered insert coil. Using inertial energy storage a synchronous motor/generator will provide ac power to a set of seven ac-dc converters rated at 64 MW/80 MVA each. These converters will energize three independent coil circuits to create 170 MJ of field energy in the outer coil set at the platform field of 47 T. The insert will then be energized to produce the balance of the 100 T peak field using a 2.3 MJ, 18 kV (charged to 15 kV), 14.4 mF capacitor bank controlled with solidstate switches. The magnet will be the first of its kind and the first non-destructive, reusable 100 T pulsed magnet. The operation of the magnet will be described along with special features of its design and construction.Index Terms-high field, pulsed magnet, 100 tesla

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“…Shell 7 is comprised of UNS S30400 stainless steel. Additional information on materials may be found in [4]. …”

Section: Methodsmentioning

confidence: 99%

First 100 T non-destructive magnet outer coil set

Bacon

Baca²,

Coe³

et al. 2000

IEEE Trans. Appl. Supercond.

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Abstract-The controlled power outer coil set of the first 100 T non-destructive (100 T ND) magnet is described. This magnet will be installed as part of the user facility research equipment at the National High Magnetic Field laboratory (NHMFL) Pulsed Field Facility at Los Alamos National Laboratory. The 100 T ND controlled power outer coil set consists of seven nested, mechanically independent externally reinforced coils. These coils, in combination, will produce a 47 T platform field in a 225-mm diameter bore. Using inertial energy storage a synchronous motor/generator provides ac power to a set of seven ac-dc converters rated at 64 MW/80 MVA each. These converters energize three independent coil circuits to create 170 MJ of field energy in the outer coil set at the platform field of 47 T. Each coil consists of a multi-layer winding of high strength conductor supported by an external high strength stainless steel shell. Coils with the highest magnetic loads will utilize a reinforcing shell fabricated from highly cold worked 301 stainless steel strip. The autofrettage conditioning method will be used to pre-stress the coils and thereby limit conductor and reinforcement strains to the elastic range. The purpose of pre-stressing the coils is to attain a design life of 10,000 full field pulses. The operation and conditioning of the coil set will be described along with special features of its design, magnetic and structural analyses and construction.Index Terms-high field, pulsed magnet, 100 tesla

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Material issues in the 100 T non-destructive magnet

Cited by 28 publications

References 7 publications

Nanostructured 1% silver-copper composite wires with a high tensile strength and a high electrical conductivity

Nanostructured 1% silver-copper composite wires with a high tensile strength and a high electrical conductivity

First 100 T non-destructive magnet

First 100 T non-destructive magnet outer coil set

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