Common-Coil Nb3Sn Dipole Program at BNL

Gupta, R.

doi:10.1007/978-3-030-16118-7_14

Nb3Sn Accelerator Magnets

2019

DOI: 10.1007/978-3-030-16118-7_14

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Common-Coil Nb3Sn Dipole Program at BNL

R. Gupta

Abstract: This chapter summarizes the common-coil dipole research and development program at the Brookhaven National Laboratory (BNL). The program goals included: (a) the development of accelerator-quality dipoles based on the commoncoil design concept; (b) the demonstration of "react-and-wind" technology for high field collider dipole magnets; and (c) the development and demonstration of a novel background field test facility with a large open space.

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Development of a high current density, high temperature superconducting cable for pulsed magnets

Sanabria,

Radovinsky,

Craighill

et al. 2024

Supercond. Sci. Technol.

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A low AC loss Rare Earth Barium Copper Oxide (REBCO) cable, based on the VIPER cable technology has been developed by Commonwealth Fusion Systems for use in high field, REBCO based tokamaks. The new cable is composed of partitioned and transposed copper ‘petals’ shaped to fit together in a circular pattern with each petal containing a REBCO tape stack and insulated from each other to reduce AC losses. A stainless steel jacket adds mechanical robustness—also serving as a vessel for solder impregnation—while a tube runs through the middle for cooling purposes. Additionally, fiber optic sensors are placed under the tape stacks for quench detection. To qualify this design, a series of experiments were conducted as part of the SPARC tokamak Central Solenoid Model Coil program—to retire the risks associated with full scale, fast ramping, high flux HTS Central Solenoid (CS) and Poloidal Field (PF) coils for tokamak fusion power plants and net energy demonstrators. These risk study and risk reduction experiments include (1) AC loss measurement and model validation in the range of ~5 T/s, (2) an IxB electromagnetic loading of over 850 kN/m at the cable level and up to 300 kN/m at the stack level, (3) a transverse compression resilience of over 350 MPa, (4) manufacturability at tokamak relevant speeds and scales, (5) cable to cable joint performance, (6) fiber optic based quench detection speed, accuracy, and feasibility, and (7) overall winding pack integration and magnet assembly. The result is a cable technology, now referred to as PIT VIPER, with AC losses that measure fifteen times lower (at ~5 T/s) than its predecessor technology; a 2% or lower degradation of critical current (Ic) at high IxB electromagnetic loads; no detectable Ic degradation up to 570 MPa of transverse compression on the cable unit cell; end to end magnet manufacturing, consistently producing Ic values within 7% of the model prediction; cable to cable joint resistances at 20 K on the order of ~15 nΩ; and fast, functional quench detection capabilities that do not involve voltage taps. This cable technology will be tested comprehensively in a Central Solenoid Model Coil to prove its readiness for compact, high field tokamak operation.

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Development of a high current density, high temperature superconducting cable for pulsed magnets

Sanabria,

Radovinsky,

Craighill

et al. 2024

Supercond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

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Common-Coil Nb3Sn Dipole Program at BNL

Cited by 1 publication

References 20 publications

Development of a high current density, high temperature superconducting cable for pulsed magnets

Development of a high current density, high temperature superconducting cable for pulsed magnets

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