title: A synthetic diagnostic for beam emission spectroscopy in the helically symmetric experiment stellarator.
abstract: The Helically Symmetric Experiment (HSX) has a number of active spectroscopy diagnostics. Due to the relatively large beam width compared to the plasma minor radius, it is difficult to achieve good spatial resolution at the core of the HSX plasma. This is due to the fact that the optical sightline cuts through many flux surfaces with varying field vectors within the beam. In order to compare the experimental results with theoretical models it is important to accurately model the beam width effects. A synthetic diagnostic has been developed for this purpose. This synthetic diagnostic calculates the effect of spot size and beam width on the measurements of quantities of interest, including radial electric field, flow velocity, and Stark polarization.
authors.affiliation: HSX Plasma Laboratory, Department of Electrical and Computer Engineering, UW-Madison, Madison, Wisconsin 53706, USA.
authors.forename: T J
authors.initials: TJ
authors.lastname: Dobbins
authors.affiliation: HSX Plasma Laboratory, Department of Electrical and Computer Engineering, UW-Madison, Madison, Wisconsin 53706, USA.
authors.forename: S T A
authors.initials: ST
authors.lastname: Kumar
authors.affiliation: HSX Plasma Laboratory, Department of Electrical and Computer Engineering, UW-Madison, Madison, Wisconsin 53706, USA.
authors.forename: D T
authors.initials: DT
authors.lastname: Anderson