Spectral diagnostics for plasma research at the GOL-3 facility

A complex of visible-region spectral diagnostics for studying high-temperature plasma at the GOL-3 facility is described. The complex includes three spectral instruments with different spectral resolutions, apertures of optics, and spatial resolutions. These instruments are equipped with digital recording units that make it possible, depending on the task being performed, to obtain highly resolved plasma-radiation spectra with either temporal or spatial resolution. The technique for measuring the electron density, ion temperature, and magnetic field are presented, along with the corresponding results.