High temperature superconducting (HTS) accelerator magnets can achieve higher magnetic field with higher current capacity. However, with the shielding current effect of the HTS materials, the current distribution inside REBCO tape will deviate from uniform current assumption, which results in a higher sextupole field harmonics. To compensate sextupole harmonic field in the accelerator magnet...
A new testing facility employing a 15-T transverse field to access the full-service-field characteristics of superconducting materials is now under development in China. A primary objective involves producing a large bore 15-T dipole magnet to serve as the source of the transverse magnetic field load. The magnet consists of a Low-Temperature Superconducting (LTS) dipole magnet providing 12 T...
As a member of the multi-lab U.S. High Luminosity LHC Accelerator Upgrade Project (HL-LHC AUP), Lawrence Berkeley National Laboratory (LBNL) is assembling high-field Nb3Sn low-beta MQXFA quadrupole magnets for eventual installation at CERN as part of the HL-LHC upgrade. Each magnet undergoes room temperature magnetic measurements at two points during the assembly process: once after completion...
Cryogenic permanent magnet undulators(CPMUs) and superconducting magnets are essential components of synchrotron light sources. The SAFALI system is a commonly used method for measuring magnetic field performance. However, installing and using the SAFALI system to measure the magnetic field in CPMUs with smaller gaps presents significant challenges. In previous studies, we used the PWM system...
As part of the U.S. Magnet Development Program, LBNL fabricated a hybrid magnet combining Nb3Sn and Bi-2212 canted-cosine theta (CCT) coils. This hybrid magnet integrates CCT5, a 1 m long, 90 mm bore Nb3Sn dipole magnet with BIN5c, a 39 cm long, 30.8 mm bore Bi-2212 dipole magnet. These magnets were fabricated and tested individually, and they were not originally designed to be assembled...
The MQXFA quadrupoles of the U.S High Luminosity LHC Accelerator Upgrade Project are being assembled at the Lawrence Berkeley National Laboratory, and then tested vertically in liquid helium (LHe), at 1.9 K, at the Brookhaven National Laboratory. Three magnets initially did not pass the vertical test due to lack of coil support at the end region. These magnets were re-assembled with increased...
