Using Laser-Induced Rydberg Spectroscopy diagnostic for direct measurements of the local electric field in the edge region of NSTX/NSTX-U: Modeling

L. Reymond; A. Diallo; V. Vekselman

doi:10.1063/1.5038877

Using Laser-Induced Rydberg Spectroscopy diagnostic for direct measurements of the local electric field in the edge region of NSTX/NSTX-U: Modeling

L. Reymond, A. Diallo, V. Vekselman

PPPL Discovery Plasma Science

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

We discuss a novel diagnostic allowing direct measurements of the local electric field in the edge region of 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_α emission. We refer to this approach as Laser-Induced Rydberg Spectroscopy. It is shown that the local electric field can be measured through the Stark induced resonances observed as dips in the D_α emission. Using forward-modeling of simulated absorption spectra, we show precisions reaching ±2 kV m^-1 in regions with a local electric field of 15 kV m^-1.

Original language	English (US)
Article number	10C106
Journal	Review of Scientific Instruments
Volume	89
Issue number	10
DOIs	https://doi.org/10.1063/1.5038877
State	Published - Oct 1 2018

All Science Journal Classification (ASJC) codes

Instrumentation

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10.1063/1.5038877

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title = "Using Laser-Induced Rydberg Spectroscopy diagnostic for direct measurements of the local electric field in the edge region of NSTX/NSTX-U: Modeling",

abstract = "We discuss a novel diagnostic allowing direct measurements of the local electric field in the edge region of 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 Dα emission. We refer to this approach as Laser-Induced Rydberg Spectroscopy. It is shown that the local electric field can be measured through the Stark induced resonances observed as dips in the Dα emission. Using forward-modeling of simulated absorption spectra, we show precisions reaching ±2 kV m-1 in regions with a local electric field of 15 kV m-1.",

author = "L. Reymond and A. Diallo and V. Vekselman",

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AU - Vekselman, V.

PY - 2018/10/1

Y1 - 2018/10/1

N2 - We discuss a novel diagnostic allowing direct measurements of the local electric field in the edge region of 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 Dα emission. We refer to this approach as Laser-Induced Rydberg Spectroscopy. It is shown that the local electric field can be measured through the Stark induced resonances observed as dips in the Dα emission. Using forward-modeling of simulated absorption spectra, we show precisions reaching ±2 kV m-1 in regions with a local electric field of 15 kV m-1.

AB - We discuss a novel diagnostic allowing direct measurements of the local electric field in the edge region of 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 Dα emission. We refer to this approach as Laser-Induced Rydberg Spectroscopy. It is shown that the local electric field can be measured through the Stark induced resonances observed as dips in the Dα emission. Using forward-modeling of simulated absorption spectra, we show precisions reaching ±2 kV m-1 in regions with a local electric field of 15 kV m-1.

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Using Laser-Induced Rydberg Spectroscopy diagnostic for direct measurements of the local electric field in the edge region of NSTX/NSTX-U: Modeling

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