Applicability of Alkali Beam Emission Spectroscopy on NSTX-U

Lampert, Mate

doi:10.34770/smme-a456

Title: Applicability of Alkali Beam Emission Spectroscopy on NSTX-U

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Authors:

Princeton Plasma Physics Laboratory; Princeton Plasma Physics Laboratory

Publication Date:: Sun Dec 31 23:00:00 EST 2023

DOE Contract Number:: AC02-09CH11466

Research Org.:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Org.:: USDOE Office of Science (SC)

Subject:: diagnostics; neutral beam; spectroscopy

OSTI Identifier:: 2447755

DOI:: https://doi.org/10.34770/smme-a456

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                    Lampert, Mate. Applicability of Alkali Beam Emission Spectroscopy on NSTX-U.  United States: N. p., 2023. 
        Web.  doi:10.34770/smme-a456.

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                    Lampert, Mate. Applicability of Alkali Beam Emission Spectroscopy on NSTX-U.  United States.  doi:https://doi.org/10.34770/smme-a456

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                    Lampert, Mate. 2023.  
"Applicability of Alkali Beam Emission Spectroscopy on NSTX-U".  United States.  doi:https://doi.org/10.34770/smme-a456.  https://www.osti.gov/servlets/purl/2447755. Pub date:Sun Dec 31 23:00:00 EST 2023

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@article{osti_2447755,

  title        = {Applicability of Alkali Beam Emission Spectroscopy on NSTX-U},

  author       = {Lampert, Mate},

  abstractNote = {},

  doi          = {10.34770/smme-a456},

  journal      = {},

  number       = ,

  volume       = ,

  place        = {United States},

  year         = {Sun Dec 31 23:00:00 EST 2023},

  month        = {Sun Dec 31 23:00:00 EST 2023}

}

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DOI: https://doi.org/10.34770/smme-a456

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Supplemental material for "Applicability of Alkali Beam Emission Spectroscopy on NSTX-U"

Dataset Lampert, Mate
Applicability of alkali beam emission spectroscopy on NSTX-U

Journal Article Lampert, M. ; Anda, G. ; Asztalos, O. ; ... - Review of Scientific Instruments

Understanding fast pedestal dynamics and turbulent transport in the edge and scrape-off layer (SOL) plasma of spherical tokamaks is crucial for the design and operation of future fusion reactors. The alkali beam emission spectroscopy diagnostic technique offers a means to measure the absolute electron density radial profile and fluctuation amplitude in these regions. Here, in this study, we demonstrate that injecting a sodium neutral beam radially into the plasma and analyzing the light emission from its 3p–3s atomic transition using near-orthogonal viewing angles allows for accurate measurement of the electron density profile and fluctuations in the National Spherical Torus Experimentmore »« less
Suppression of Alfvén modes on NSTX-U with outboard beam injection

Dataset Fredrickson, E D ; Belova, E V ; Battaglia, D J ; ...

In this paper we present data from experiments on NSTX-U where it is shown for the first time that small amounts of high pitch-angle beam ions can strongly suppress the counter-propagating Global Alfvén Eigenmodes (GAE). GAE have been implicated in the redistribution of fast ions and modification of the electron power balance in previous experiments on NSTX. The ability to predict the stability of Alfvén modes, and developing methods to control them, is important for fusion reactor like the International Tokamak Experimental Reactor (ITER) which are heated by a large population of non-thermal, super-Alfvénic ions consisting of fusion generated alphasmore »« less
Modeling of a Laser-Induced Rydberg Spectroscopy diagnostic for Direct Measurement of the Local Electric Field in the Edge Region of NSTX/NSTX-U

Dataset Reymond, L ; Diallo, A ; Vekselman, V

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 populatedmore »« less
A scalable real-time framework for Thomson scattering analysis: Application to NSTX-U

Dataset

A detailed description of a prototype setup for real-time (rt) Thomson scattering (TS) analysis is presented and implemented in the multi-point Thomson scattering (MPTS) diagnostic system at the National Spherical Torus Experiment Upgrade(NSTX-U). The data acquisition hardware was upgraded with rt capable electronics (rt-analog digital converters (ADCs) and a rt server) that allow for fast digitization of the laser pulse signal of eight radial MPTS channels. In addition, a new TS spectrum analysis software for a rapid calculation of electron temperature (Te) and electron density (ne) was developed. Testing of the rt hardware and data analysis soft-ware was successfully completedmore »« less

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