Test of Fully Impregnated and Insulated REBCO Pancake to Validate Large Bore Split Magnet Mechanical Design

REBCO HTS material makes it possible to consider very high engineering current densities and energy densities in coil windings Their use for very high field insert is already extensively studied, but they are also attractive for high field outserts or other meter-scale standalone magnets. In this work present preliminary studies for an insulated 500 mm split REBCO magnet concept. The conductor consist of co-wound REBCO and Hastelloy reinforcement tapes, In order to use efficiently the conductor, full impregnation is considered to enable effective stress averaging in the winding. Such impregnation is made possible by the use of thin film insulation on the co-wound metal reinforcement tape limiting the risk of delamination when cooling down. This concept was validated on a small-scale pancake tested under high stress in background field. Mechanical modelling compared to experimental strain measurement demonstrate the stress redistribution.