Evaluation of thermal helium beam and line-ratio fast diagnostic on the National Spherical Torus Experiment-Upgrade-Reference-Cited by-同舟云学术

Evaluation of thermal helium beam and line-ratio fast diagnostic on the National Spherical Torus Experiment-Upgrade

Published:2016-05-01 Issue:5 Volume:23 Page:
ISSN:1070-664X
Container-title:Physics of Plasmas
language:en
Short-container-title:

Author:

Muñoz Burgos J. M.¹^ORCID,Agostini M.²,Scarin P.²,Stotler D. P.³^ORCID,Unterberg E. A.⁴^ORCID,Loch S. D.⁵,Schmitz O.⁶,Tritz K.¹,Stutman D.¹

Affiliation:

1. Johns Hopkins University 1 Department of Physics and Astronomy, , Baltimore, Maryland 21218, USA

2. Universita di Padova 2 Consorzio RFX (CNR, ENEA, INFN, , Acciaierie Venete SpA), Corso Stati Uniti 4, 35127 Padova, Italy

3. Princeton Plasma Physics Laboratory 3 , Princeton, New Jersey 08543, USA

4. Oak Ridge National Laboratory 4 , Oak Ridge, Tennessee 37831, USA

5. Auburn University 5 Department of Physics, , Auburn, Alabama 36849, USA

6. University of Wisconsin-Madison 6 Department of Engineering Physics, , Madison, Wisconsin 53706, USA

Abstract

A 1-D kinetic collisional radiative model with state-of-the-art atomic data is developed and employed to simulate line emission to evaluate the Thermal Helium Beam (THB) diagnostic on NSTX-U. This diagnostic is currently in operation on RFX-mod, and it is proposed to be installed on NSTX-U. The THB system uses the intensity ratios of neutral helium lines 667.8, 706.5, and 728.1 nm to derive electron temperature (eV) and density (cm−3) profiles. The purpose of the present analysis is to evaluate the applications of this diagnostic for determining fast (∽4 μs) electron temperature and density radial profiles on the scrape-off layer and edge regions of NSTX-U that are needed in turbulence studies. The diagnostic is limited by the level of detection of the 728.1 nm line, which is the weakest of the three. This study will also aid in future design of a similar 2-D diagnostic system on the divertor.

Funder

U.S. Department of Energy

Publisher

AIP Publishing

Link

http://aip.scitation.org/doi/am-pdf/10.1063/1.4948554

Reference31 articles.

1. Status of electron temperature and density measurement with beam emission spectroscopy on thermal helium at TEXTOR

2. HELIOS: A helium line-ratio spectral-monitoring diagnostic used to generate high resolution profiles near the ion cyclotron resonant heating antenna on TEXTOR

3. Optical measurements for turbulence characterization in RFX-mod edge

4. Sensitivity of calculated neutral helium line intensities and their ratios to uncertainties in excitation rate coefficients

Cited by 19 articles. 订阅此论文施引文献订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献

1. Simultaneous two-dimensional measurement of plasma density and electron temperature evolution via multi-color gas puff imaging on the HL-3 tokamak;Review of Scientific Instruments;2025-06-01

2. Helium line emission spectroscopy to measure plasma parameters using modeling and machine learning in low-temperature plasmas;Journal of Physics D: Applied Physics;2024-07-26

3. Two-dimensional reconstruction of filament temperatures and densities with the thermal helium beam at ASDEX Upgrade;Physics of Plasmas;2023-09-01

4. Validation of 2D Te and ne measurements made with Helium imaging spectroscopy in the volume of the TCV divertor;Nuclear Fusion;2023-02-10

5. Bayesian modeling of collisional-radiative models applicable to thermal helium beam plasma diagnostics;Nuclear Materials and Energy;2022-10