Improved Optical Diagnostic System for the Fuze-Q Z-Pinch Experiment

Spectral data from non-invasive diagnostics provide a straightforward method of determining relevant plasma parameters (n e , n i , v i , B, etc.). Previous Ion Doppler Spectroscopy on the ZaP and FuZE experiments utilized radial and oblique telecentric telescopes to calculate T i and v i through measuring the C III 229.7nm and O V 278 nm lines. However, the system could not encompass the entire pinch plasma, and the telescopes were limited to a preset configuration which restricted the system’s ability to measure arbitrary impurity emission lines. A new spectroscopic system that addresses the previous shortcomings will be employed for FuZE-Q. Simultaneous measurements of the Z pinch will increase from two to four with two sets of radial and oblique telescopes measuring the x- and y-direction, respectively. Each telescope will view 10 chords to image the entire pinch plasma. In addition, a rail mount will allow the system to move along the z-direction to provide 3D spectroscopic tomography. A low-cost, swappable lens design will provide changeable magnification and field of view, thereby increasing our resolution of impurity and ionization migration. Initial spectra and plasma parameters are presented.