# Modeling of a Laser-Induced Rydberg Spectroscopy diagnostic for Direct Measurement of the Local Electric Field in the Edge Region of NSTX/NSTX-U

Reymond, L.; Diallo, A.; Vekselman, V.
Issue date: July 2018
Cite as:
Reymond, L., Diallo, A., & Vekselman, V. (2018). Modeling of a Laser-Induced Rydberg Spectroscopy diagnostic for Direct Measurement of the Local Electric Field in the Edge Region of NSTX/NSTX-U [Data set]. Princeton Plasma Physics Laboratory, Princeton University.
@electronic{reymond_l_2018,
author      = {Reymond, L. and
Diallo, A. and
Vekselman, V.},
title       = {{Modeling of a Laser-Induced Rydberg Spec
troscopy diagnostic for Direct Measureme
nt of the Local Electric Field in the Ed
ge Region of NSTX/NSTX-U}},
publisher   = {{Princeton Plasma Physics Laboratory, Pri
nceton University}},
year        = 2018
}
Abstract:

We discuss a novel diagnostic allowing direct measurements of the local electric field in the edge region in NSTX/NSTX-U. This laser based diagnostic's principle consists of depleting the naturally populated $n=3$ level to a Rydberg state --sensitive to electric fields-- that will result in a suppression of part of the $D_{\alpha}$ emission. We refer to this approach as Laser-Induced Rydberg Spectroscopy (LIRyS). It is shown that the local electric field can be measured through the Stark induced resonances observed as dips in the $D_\alpha$ emission. Using forward-modeling of simulated absorption spectra, we show precisions reaching \SI{\pm 2}{\kilo\volt\per\meter} in regions with a local electric field of \SI{15}{\kilo\volt\per\meter}.

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