Conveners
Tue-Af-Po2.14 - No-Insulation Coil Technology
- Arnaud Badel (Tohoku University)
- Xavier Chaud (LNCMI-EMFL-CNRS, Univ. Grenoble Alpes, INSA, UPS)
This paper reports a design and performance estimation of a 20 T no-insulation (NI) high temperature superconductor (HTS) standalone user magnet currently being developed at the National High Magnetic Field Laboratory. It consists of a stack of 17 double pancake coils wound with tapes from two different vendors, SuNAM and SuperPower, in consideration of their complementary in-field critical...
This paper presents our analysis of the electromagnetic characteristic and thermal stability of 2G high-temperature superconductor (HTS) pancake coils depending on the turn-to-turn contact resistance. Numerical simulations for investigating electromagnetic characteristic, mechanical stress and thermal stability of HTS pancake coils were performed by taking into account different contact...
This article analyzes the charging behavior of no-insulation high temperature superconducting (HTS) ReBCO double-cake coils under conduction cooling and liquid nitrogen cooling in detail. A partial equivalent circuit model of a determined parameter ReBCO coil is applied to evaluate charging behavior under different cooling conditions. At the same time, the finite element method is used to...
This paper is to study the practical critical current of No-insulation (NI) high temperature superconducting (HTS) coils under local heat disturbances. Based on a multi-physics model that built from an electric network model, a thermal coil model and a magnetic field model, behaviors of a HTS coil under different currents and heat disturbances are compared in this paper. A balance model of HTS...
The no-insulation (NI) method has provided dramatic progress on the high-field magnet technology in the last decade. An NI REBCO pancake coil can operate at a very high current density supported by a self-protecting behavior. However, it was recently demonstrated that asymmetric distributions of axial forces due to electromagnetic forces during the quench propagation results in serious...
Recently, we have reported that screening currents in REBCO high field magnets may be a source of large electromagnetic stresses and consequently cause mechanical damage to the superconducting tape. To better estimate the electromechanical behavior of a REBCO magnet even in the initial design stage, we have modeled the distribution of screening currents in an NI REBCO magnet and compared the...
Due to the special rectangular cross section of the REBCO tapes, the screening current-Induced magnetic field (SCIF) in a REBCO high temperature superconducting (HTS) coil will deteriorate the spatial homogeneity and temporal stability of the superconducting magnet, which is a key issue for the application of HTS magnets in the Nuclear Magnetic Resonance (NMR) and Magnetic Resonance Imaging...
The NHMFL has commenced with the development of an all-superconducting 40 T magnet that will be installed in its DC-Field User Facility. At present various high temperature superconductor technologies are being investigated as candidates for the magnet construction. It is the objective of this early development stage to address questions regarding the application of a type of superconductor...
Tokamak Energy are developing large scale REBCO HTS magnets for application in spherical tokamaks for fusion energy. As part of our HTS technology development plan, a series of quality assessment (QA) coils have been manufactured and tested. These are non-insulated coils containing ~100 m of HTS tape. The manufacture and testing of these magnets has allowed us to assess the performance of HTS...
