Fast Ion Doppler Spectroscopy Measurements During Magnetic Reconnection in a Compact Torus

The preliminary results of ion temperature ($T_{i})$ and flow velocity measurements at the Prairie View (PV) Rotamak, which can operate in Field-Reversed Configuration (FRC) and Spherical Tokamak (ST) regimes, are presented. The measurements are performed through a fast (1 \textit{$\mu $}s time resolution) Ion Doppler Spectroscopy (IDS) diagnostics, which employs a Jarrell-Ash 50 monochromator with a ruled diffraction grating of 1180 G/mm line density, over 40 ms plasma discharge period. In order to identify the impurity emmision lines, a BWTek $i$-trometer spectrometer is used to record a time-integrated spectrum of each plasma shot. Furthermore, the measurements are extended to the magnetic reconnection experiments, where two FRCs are formed when magnetic shaping coils [\textit{Yang et al}, Phys. Rev. Lett \textbf{102}, 255004 (2009)] are energized, and later the two FRCs are merged when the DC current flowing through the shaping coils is shut off. Here, the variations in $T_{i}$ and flow velocity during the magnetic reconnection are investigated.