AC Losses of an HTS Insert in a 25-T Cryogen-Free Superconducting Magnet

Effect of LTS background coil size on the AC loss generated in the REBCO HTS insert magnet

“…The numerical calculation is based on a slab model proposed by [1,2]. The 24 single pancakes are numbered as I = 1, 2…, 24.…”

“…Up to now, many works focus on the ac loss have been reported [1][2][3]. But, little research is done on the effect of the LTS background coil size on the ac loss of the REBCO insert magnet.…”

Non-twisted stacks of coated conductors for magnets: Analysis of inductance and AC losses

“…A relatively well-studied case is the cryogen-free 25 T magnet at Tohoku University: the magnet consists of a LTS outsert and a HTS insert; see [21] for the characteristics of the coils. This section reviews the results published in [22] and [23], adding minor observations. In the HTS insert the main loss component is the hysteretic one.…”

“…In the HTS insert the main loss component is the hysteretic one. The hysteretic loss can be estimated [22][23] as the sum of the loss associated to the axial field component (parallel to the broad face of the tape) plus the loss associated to the radial field component (perpendicular to the broad face of the tape). The infinite slab model is used for both components.…”

AC loss evaluation of an HTS insert for high field magnet cooled by cryocoolers

“…The critical current density J SC of the target turn is calculated with the approximate expression [16] by using the magnitude |B k | and the angle h k of local magnetic field B k at the center of the SC layer. It is assumed in this study that the temperature is fixed at 4.2 K and constant.…”