A near X-point charge exchange neutral spectroscopy (CENS) system for DIII-D

Haskey, S. R.; Chrystal, C.; Angulo, A.; Bortolon, A.; Wolfe, E.; Linsenmayer, E.; Marini, C.; Scotti, F.; Agustin, K.

doi:10.1063/5.0219576

A near X-point charge exchange neutral spectroscopy (CENS) system for DIII-D

Journal Article · Thu Sep 05 04:00:00 EDT 2024 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/5.0219576· OSTI ID:2571707

^[1]; ^[2]; Angulo, A. ^[1]; ^[1]; Wolfe, E. ^[1]; ^[2]; ^[3]; ^[4]; Agustin, K. ^[2]

Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
General Atomics, San Diego, CA (United States)
Univ. of California, San Diego, CA (United States)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

A 16 channel spectroscopy system has been installed on DIII-D to provide information about the energy distribution of the atomic neutrals using the Doppler shift and broadening of passive Balmer-α emission. Here, the lines of sight are dominantly in the toroidal direction, with tangencies near the lowest point on closed magnetic flux surfaces moving from the lower divertor upward into the confined plasma. This allows the system to provide details of the neutrals as they undergo various atomic physics processes while traveling upward from the lower divertor. The spectrally resolved measurements provide several advantages that complement typical optical filter based measurements of hydrogenic spectral lines. These include more direct measurements of the neutrals that fuel deeper in the plasma and capturing neutral velocity distribution information via the Doppler broadened and shifted line. In addition, the spectral separation of higher energy “thermal” neutrals and bright cold emission from the scrape-off layer allows for a more straightforward calculation of the underlying neutral densities based on the emission because of the dependence of the thermal emission on confined plasma properties that are approximately flux functions and well measured.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: FG02-07ER54917; FC02-04ER54698; AC02-09CH11466; AC52-07NA27344

OSTI ID:: 2571707

Report Number(s):: LLNL--JRNL-871819

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 9 Vol. 95; ISSN 1089-7623; ISSN 0034-6748

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

Country of Publication:: United States

Language:: English

References (21)

Measurement and monte carlo computations of Hα profiles in front of a TEXTOR limiter Reiter, D.; Bogen, P.; Samm, U. Journal of Nuclear Materials, Vol. 196-198 https://doi.org/10.1016/s0022-3115(06)80195-9	journal	December 1992
High resolution measurements of neutral density and ionization rate in the Alcator C-Mod tokamak Boivin, R. L.; Hughes, J. W.; LaBombard, B. Review of Scientific Instruments, Vol. 72, Issue 1 https://doi.org/10.1063/1.1319362	journal	January 2001
The Filterscope Colchin, R. J.; Hillis, D. L.; Maingi, R. Review of Scientific Instruments, Vol. 74, Issue 3 https://doi.org/10.1063/1.1537038	journal	March 2003
High-throughput accurate-wavelength lens-based visible spectrometer Bell, Ronald E.; Scotti, Filippo Review of Scientific Instruments, Vol. 81, Issue 10 https://doi.org/10.1063/1.3485096	journal	October 2010
High accuracy wavelength calibration for a scanning visible spectrometer Scotti, Filippo; Bell, Ronald E. Review of Scientific Instruments, Vol. 81, Issue 10 https://doi.org/10.1063/1.3489975	journal	October 2010
Active spectroscopic measurements of the bulk deuterium properties in the DIII-D tokamak (invited) Grierson, B. A.; Burrell, K. H.; Chrystal, C. Review of Scientific Instruments, Vol. 83, Issue 10 https://doi.org/10.1063/1.4739239	journal	October 2012
High resolution main-ion charge exchange spectroscopy in the DIII-D H-mode pedestal Grierson, B. A.; Burrell, K. H.; Chrystal, C. Review of Scientific Instruments, Vol. 87, Issue 11 https://doi.org/10.1063/1.4960604	journal	September 2016
Measurement of deuterium density profiles in the H-mode steep gradient region using charge exchange recombination spectroscopy on DIII-D Haskey, S. R.; Grierson, B. A.; Burrell, K. H. Review of Scientific Instruments, Vol. 87, Issue 11 https://doi.org/10.1063/1.4963148	journal	September 2016
Active spectroscopy measurements of the deuterium temperature, rotation, and density from the core to scrape off layer on the DIII-D tokamak (invited) Haskey, S. R.; Grierson, B. A.; Stagner, L. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5038349	journal	October 2018
A 1D Lyman-alpha profile camera for plasma edge neutral studies on the DIII-D tokamak Rosenthal, A. M.; Hughes, J. W.; Bortolon, A. Review of Scientific Instruments, Vol. 92, Issue 3 https://doi.org/10.1063/5.0024115	journal	March 2021
Ion thermal transport in the H-mode edge transport barrier on DIII-D Haskey, S. R.; Ashourvan, Arash; Banerjee, S. Physics of Plasmas, Vol. 29, Issue 1 https://doi.org/10.1063/5.0072155	journal	January 2022
Details of the neutral energy distribution and ionization source using spectrally resolved Balmer-alpha measurements on DIII-D Haskey, S. R.; Grierson, B. A.; Stagner, L. Review of Scientific Instruments, Vol. 93, Issue 10 https://doi.org/10.1063/5.0101854	journal	October 2022
Atomic and molecular database for fusion plasma edge studies Janev, R. K.; Harrison, M. F. A.; Drawin, H. W. Nuclear Fusion, Vol. 29, Issue 1 https://doi.org/10.1088/0029-5515/29/1/015	journal	January 1989
Particle source and edge confinement study based on spectroscopic diagnosis in the LHD Goto, M.; Sawada, K.; Oishi, T. Plasma Physics and Controlled Fusion, Vol. 58, Issue 8 https://doi.org/10.1088/0741-3335/58/8/084001	journal	June 2016
A gyrokinetic perspective on the JET-ILW pedestal Hatch, D. R.; Kotschenreuther, M.; Mahajan, S. Nuclear Fusion, Vol. 57, Issue 3 https://doi.org/10.1088/1741-4326/aa51e1	journal	January 2017
Overview of density pedestal structure: role of fueling versus transport Mordijck, S. Nuclear Fusion, Vol. 60, Issue 8 https://doi.org/10.1088/1741-4326/ab8d04	journal	July 2020
Outer midplane neutral density measurements and H-mode fueling studies in NSTX-U Scotti, F.; Stotler, D. P.; Bell, R. E. Nuclear Fusion, Vol. 61, Issue 3 https://doi.org/10.1088/1741-4326/abcdb5	journal	January 2021
Role of the separatrix density in the pedestal performance in deuterium low triangularity JET-ILW plasmas and comparison with JET-C Frassinetti, L.; Perez von Thun, C.; Chapman, B. Nuclear Fusion, Vol. 61, Issue 12 https://doi.org/10.1088/1741-4326/ac3363	journal	November 2021
Inversion Methods of the Balmer-α Line Profile for Hydrogen Atom Density Evaluation in High-Temperature Plasmas Fujii, Keisuke; Goto, Motoshi; Morita, Shigeru Fusion Science and Technology, Vol. 69, Issue 2 https://doi.org/10.13182/fst15-168	journal	April 2016
The EIRENE and B2-EIRENE Codes Reiter, D.; Baelmans, M.; Börner, P. Fusion Science and Technology, Vol. 47, Issue 2 https://doi.org/10.13182/fst47-172	journal	February 2005
Hydrogen Spectral Line Shape Formation in the SOL of Fusion Reactor Plasmas Lisitsa, Valery; Kadomtsev, Mikhail; Kotov, Vladislav Atoms, Vol. 2, Issue 2 https://doi.org/10.3390/atoms2020195	journal	May 2014

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