Record fast-cycling accelerator magnet based on high temperature superconductors

TL;DR

This paper demonstrates a novel high-temperature superconductor magnet achieving record fast ramping rates of 12 T/s, significantly surpassing traditional low-temperature superconductor limits for accelerator applications.

Contribution

It introduces the first high-temperature superconductor magnet capable of high ramping rates, overcoming AC loss limitations of low-temperature superconductors.

Findings

Achieved 12 T/s ramping rate in a prototype magnet.

Demonstrated lower AC losses with high-temperature superconductors.

Surpassed previous ramping rate records for accelerator magnets.

Abstract

Four decades ago development of high-current superconducting NbTi wire cables revolutionized the magnet technology for energy frontier accelerators, such as Tevatron, RHIC and LHC. The NbTi based magnets offered advantage of much higher fields B and much lower electric wall plug power consumption if operated at 4.5 K but relatively small ramping rates dB/dt << 0.1 T/s. The need for the accelerators of high average beam power and high repetition rates have initiated studies of fast ramping SC magnets, but it was found the AC losses in the low-temperature superconductors preclude obtaining the rates in the excess of (1- 4) T/s. Here we report the first application of high-temperature superconductor magnet technology with substantially lower AC losses and report record high ramping rates of 12 T/s achieved in a prototype dual-aperture accelerator magnet.