\textbf{Behavior of a tracer-containing compact toroid in a transverse magnetic field}

Fusion reactor plasma cooling can be caused by impurity contamination, which worsens plasma confinement. Therefore, studying the behavior of impurities in a magnetically confined plasma is of interest. A tracer-containing compact toroid (TCCT) injection technique that utilizes a magnetized coaxial plasma gun (MCPG) has been proposed as a new tracer injection method for impurity transport study [1]. The MCPG with a tracer source has been developed as a TCCT injector. The tracer source consists of a rod electrode made of tracer elements and a cylindrical electrode. The plasma containing tracer ions are generated by an independently controlled pulsed discharge in the tracer source. Then, the plasma is accelerated up to several hundreds of km/s by an MCPG discharge and ejected as a TCCT. The main purpose of this study is to observe impurity behavior in a field-reversed configuration (FRC) using the TCCT technique. Experiments on TCCT injection into a transverse magnetic field emulating the confinement magnetic field of an FRC have been conducted to understand whether tracer ions can be injected into FRCs without separation from a TCCT. [1] D. Kobayashi \textit{et al}., Rev. Sci. Instrum. \textbf{89}, 10I111 (2018).