Available information in 2D motional Stark effect imaging

Abstract

Recent advances in imaging techniques have allowed the extension of the standard polarimetric 1D motional Stark effect (MSE) diagnostic to 2D imaging of the internal magnetic field of fusion devices [J. Howard, Plasma Phys. Controlled Fusion 50, 125003 (2008)]. This development is met with the challenge of identifying and extracting the new information, which can then be used to increase the accuracy of plasma equilibrium and current density profile determinations. This paper develops a 2D analysis of the projected MSE polarization orientation and Doppler phase shift. It is found that, for a standard viewing position, the 2D MSE imaging system captures sufficient information to allow imaging of the internal vertical magnetic field component B(Z)(r,z) in a tokamak.

Benchmark of collisional–radiative models for ITER beams at the Alcator C-Mod tokamak

“…Similarly, BES and MSE imaging systems [51,52] will also be sensitive to the effects discussed above.…”

Spatial heterodyne Stokes vector imaging of the motional Stark-Zeeman multiplet

“…12 When the ellipticity is not negligible, for example due to non-ideal optical components or Stark-Zeeman coupling, 6 an additional carrier wave is generated at wave vector k x that allows to be estimated independently of the orientation angle θ . When interpreting the imaging measurements, it is important to account for possible non-statistical populations that can affect the component relative emissivities, Stark-Zeeman coupling and line-of-sight integration.…”