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As a novel high-temperature superconducting (HTS) conductor structure composed of the stacked 1-mm wide REBCO tapes, Narrow-Staked (NS) wire has been demonstrated to have a significant reduction effect of AC loss and screening current induced field (SCIF) in the insulated HTS coils. Thus, NS wire is a promising HTS conductor design for the practical magnet applications. Meanwhile, due to the enhanced engineering current density, thermal stability, and self-protecting features compared with the traditional insulted HTS coil, no-insulation (NI) coil has been a widely used technology for HTS magnets. Although NS wire was proved as an improvement for insulated HTS magnet, the NS wire effects on NI coil is not confirmed due to the special characteristics of the NI coil. In this paper, a NI pancake coil sample was wound with the fabricated NS wire. To evaluate the performance of NI coil wound with NS wire, the charge-discharge and sudden discharge tests were undergone at the liquid nitrogen temperature. Besides, the characteristic resistance was also analyzed for the NI coil sample. This paper result will provide a useful reference for NS wire application on NI HTS magnets.
