Spatial Calibration of a New Pilatus3-Based Multi-Energy Soft X-ray Camera on MST*

We present a spatial calibration for the new multi-energy soft x-ray pinhole camera based on the PILATUS3 detector installed on the Madison Symmetric Torus (MST). The detector has a two-dimensional array of 487 x 195 pixels for each of which lower-threshold cutoff energies can be independently set.  The large numbers of pixels and individual energy settings provide a unique combination of spatial and spectral resolution to aid the inference of important plasma parameters (e.g. T_e, n_Z, Z_eff).  Spatial position and resolution for the 487 poloidal lines of sight were calibrated in situ using an Iron-55 x-ray source that was inserted into MST under vacuum, and scanned vertically.  This poloidal calibration shows that the camera can view almost the entire minor cross section of MST with a resolution of approximately 1.0 cm (~ρ_i), making high spatial resolution studies of islands and helical structures feasible. The 195 toroidal lines of sight can be calibrated using target emission from in-vessel fiducials, since lack of an appropriate port means use of the Iron-55 is not feasible.