Conveners
WED-OR3-702 Magnetization and Loss
- Emmanuele Ravaioli (CERN)
- Yuji Tsuchiya (Nagoya University)
High-temperature superconducting REBCO tapes are expected to be applied to next-generation magnets for their high critical current density. One of their problems in the magnet application is the magnetic field instability caused by the decay of magnetization due to the shielding current caused by the tape shape. Therefore, it is important to evaluate the magnetization relaxation of REBCO tapes...
Non-insulated (NI) coils in superconducting REBCO high-field magnets provide electro-thermal stability. However, current transfer between turns through the metal causes transient currents and magnetic fields, increasing the AC loss and requiring longer times to charge the magnet. Therefore, magnet design and optimization requires numerical modeling. Although 3D modeling provides the full...
High-temperature superconducting (HTS) composites are being considered for use in high-field magnets for future particle accelerators, as they allow the development of very high field dipoles and quadrupoles. As part of the US Magnet Development Program, LBNL is developing Bi2212- and REBCO-based insert magnets towards 20 T hybrid dipole magnets. The field quality of the magnets is important...
In agreement with CERN the LASA laboratory of INFN (National Institute for Nuclear Physics) of Milan has carried out the industrial development of a novel type of magnet, for the High Order (HO) correctors of the High Luminosity - LHC (HL-LHC) project. These corrector magnets are based on a superferric design and will be installed in the new HL-LHC insertion regions for the ATLAS and CMS...
Most of the existing AC loss experiments and simulations of High Temperature Superconductors Coils deal with low currents of less than 100 A, which does not provide sufficient data or analysis for the HTS coils with higher current at 500 A to 800 A. If the AC loss is considerably larger, it will result in high heat dissipation into the HTS coils, and so as to elevate the coil temperature and...
The Super Separator Spectrometer (S3) aims to study the limits of the nuclear existence [1][2].
In order to achieve large momentum as well as charge-state acceptance for S3 layout, a high-gradient field magnet technology that generates a pure normal multipole field has been designed. This magnet is designed according to the current sheet approach. For a better overall quality field produced...
Magnetic field and current variations are responsible for AC losses in superconductive magnets. These losses may induce an increase of temperature within the material and negatively affect the performance of the magnet.
Developed at CEA, the new fully analytical model named COLISEUM (COupling Losses analytIcal Stages cablEs Unified Model) aims at predicting the coupling losses at various...
During its nominal operation, strong current variation, more than 10 kA per second, can be imposed on the KSTAR PF (Poloidal Field) magnet system. Due to AC loss, transient massive backward flow can occur, especially at the cryogen inlets of each magnet. To protect cryogen circulator, several valves are activated to adjust or lower pressure below the circulator’s operation limit. In this work,...
