Design of the Thomson scattering system for an FRC device

A Thomson scattering diagnostic system was designed for a Field-Reversed Configuration (FRC) device. The system is anticipated to provide high-resolution measurements of electron temperature (10 eV–10 keV) and density (10¹⁸–10²¹ m⁻³). A 100 kHz 1064 nm burst-mode laser was chosen to enable high-speed diagnostics. Fiber-coupled collection optics and a high-speed data acquisition system were integrated within the stringent spatial constraints of the experimental device. Dual-sided polychromators were designed through Zemax simulation. A simulated annealing algorithm was employed to determine the spectral channel boundaries of the five-channel polychromator over the electron temperature range of 0.5–10 keV. The simulated results demonstrate the system’s capability for accurate, high-sensitivity plasma diagnostics.