Evaluation of thermal helium beam and line-ratio fast diagnostic on the National Spherical Torus Experiment-Upgrade
Abstract
A 1-D kinetic collisional radiative model (CRM) 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 (SOL) 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. In conclusion, this study will also aid in future design of a similar 2-D diagnostic systems on the divertor.
- Authors:
-
[1];
[3];
[4];
- Johns Hopkins Univ., Baltimore, MD (United States)
- INFN, Univ. di Padova, Padova (Italy)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Auburn Univ., Auburn, AL (United States)
- Univ. of Wisconsin-Madison, Madison, WI (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Johns Hopkins Univ., Baltimore, MD (United States); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1503987
- Alternate Identifier(s):
- OSTI ID: 1248475; OSTI ID: 1251714
- Grant/Contract Number:
- AC05-00OR22725; AC02-09CH11466; SC0012315; AC02-09ch11466; S0000787
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 23; Journal Issue: 5; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 97 MATHEMATICS AND COMPUTING; charge exchange reactions; computer modeling; tokamaks; plasma diagnostics; collision theories
Citation Formats
Muñoz Burgos, Jorge M., Agostini, Matteo, Scarin, Paolo, Stotler, Daren P., Unterberg, Ezekial A., Loch, Stuart D., Schmitz, Oliver, Tritz, Kevin, and Stutman, Dan. Evaluation of thermal helium beam and line-ratio fast diagnostic on the National Spherical Torus Experiment-Upgrade. United States: N. p., 2016.
Web. doi:10.1063/1.4948554.
Muñoz Burgos, Jorge M., Agostini, Matteo, Scarin, Paolo, Stotler, Daren P., Unterberg, Ezekial A., Loch, Stuart D., Schmitz, Oliver, Tritz, Kevin, & Stutman, Dan. Evaluation of thermal helium beam and line-ratio fast diagnostic on the National Spherical Torus Experiment-Upgrade. United States. https://doi.org/10.1063/1.4948554
Muñoz Burgos, Jorge M., Agostini, Matteo, Scarin, Paolo, Stotler, Daren P., Unterberg, Ezekial A., Loch, Stuart D., Schmitz, Oliver, Tritz, Kevin, and Stutman, Dan. Fri .
"Evaluation of thermal helium beam and line-ratio fast diagnostic on the National Spherical Torus Experiment-Upgrade". United States. https://doi.org/10.1063/1.4948554. https://www.osti.gov/servlets/purl/1503987.
@article{osti_1503987,
title = {Evaluation of thermal helium beam and line-ratio fast diagnostic on the National Spherical Torus Experiment-Upgrade},
author = {Muñoz Burgos, Jorge M. and Agostini, Matteo and Scarin, Paolo and Stotler, Daren P. and Unterberg, Ezekial A. and Loch, Stuart D. and Schmitz, Oliver and Tritz, Kevin and Stutman, Dan},
abstractNote = {A 1-D kinetic collisional radiative model (CRM) 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 (SOL) 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. In conclusion, this study will also aid in future design of a similar 2-D diagnostic systems on the divertor.},
doi = {10.1063/1.4948554},
journal = {Physics of Plasmas},
number = 5,
volume = 23,
place = {United States},
year = {Fri May 06 00:00:00 EDT 2016},
month = {Fri May 06 00:00:00 EDT 2016}
}
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Works referencing / citing this record:
Time-dependent analysis of visible helium line-ratios for electron temperature and density diagnostic using synthetic simulations on NSTX-U
journal, July 2016
- Muñoz Burgos, J. M.; Barbui, T.; Schmitz, O.
- Review of Scientific Instruments, Vol. 87, Issue 11
Invited Review Article: Gas puff imaging diagnostics of edge plasma turbulence in magnetic fusion devices
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Evaluation of emission contributions from charge-exchange between the excited states of deuterium with He + during diagnostic of thermal helium gas beam injection and laser-induced fluorescence
journal, June 2019
- Muñoz Burgos, J. M.; Griener, M.; Loreau, J.
- Physics of Plasmas, Vol. 26, Issue 6
Charge transfer in low-energy collisions of H with He + and H + with He in excited states
journal, April 2018
- Loreau, J.; Ryabchenko, S.; Burgos, J. M. Muñoz
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