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

Muñoz Burgos, Jorge M.; Agostini, Matteo; Scarin, Paolo; Stotler, Daren P.; Unterberg, Ezekial A.; Loch, Stuart D.; Schmitz, Oliver; Tritz, Kevin; Stutman, Dan

doi:10.1063/1.4948554

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

Journal Article · Fri May 06 00:00:00 EDT 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4948554· OSTI ID:1503987

^[1]; Agostini, Matteo ^[2]; Scarin, Paolo ^[2];

^[3];

^[4]; Loch, Stuart D. ^[5]; Schmitz, Oliver ^[6]; Tritz, Kevin ^[1]; Stutman, Dan ^[1]

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)

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.

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Research Organization:: 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 Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC05-00OR22725; AC02-09CH11466; SC0012315; AC02-09ch11466; S0000787

OSTI ID:: 1503987

Alternate ID(s):: OSTI ID: 1248475; OSTI ID: 1251714

Journal Information:: Physics of Plasmas, Vol. 23, Issue 5; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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Cited By (4)

Time-dependent analysis of visible helium line-ratios for electron temperature and density diagnostic using synthetic simulations on NSTX-U Muñoz Burgos, J. M.; Barbui, T.; Schmitz, O. Review of Scientific Instruments, Vol. 87, Issue 11 https://doi.org/10.1063/1.4955286	journal	July 2016
Invited Review Article: Gas puff imaging diagnostics of edge plasma turbulence in magnetic fusion devices Zweben, S. J.; Terry, J. L.; Stotler, D. P. Review of Scientific Instruments, Vol. 88, Issue 4 https://doi.org/10.1063/1.4981873	journal	April 2017
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 Muñoz Burgos, J. M.; Griener, M.; Loreau, J. Physics of Plasmas, Vol. 26, Issue 6 https://doi.org/10.1063/1.5088363	journal	June 2019
Charge transfer in low-energy collisions of H with He ⁺ and H ⁺ with He in excited states Loreau, J.; Ryabchenko, S.; Burgos, J. M. Muñoz Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 51, Issue 8 https://doi.org/10.1088/1361-6455/aab425	journal	April 2018

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