Midplane neutral density profiles in the National Spherical Torus Experiment

Stotler, D. P.; Scotti, F.; Bell, R. E.; Diallo, A.; LeBlanc, B. P.; Podesta, M.; Roquemore, A. L.; Ross, P. W.

doi:10.1063/1.4928372

Title: Midplane neutral density profiles in the National Spherical Torus Experiment

Journal Article · Thu Aug 13 00:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4928372· OSTI ID:1281661

Stotler, D. P. ^[1]; Scotti, F. ^[2]; Bell, R. E. ^[1]; Diallo, A. ^[1]; LeBlanc, B. P. ^[1]; Podesta, M. ^[1]; Roquemore, A. L. ^[1]; Ross, P. W. ^[1]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Atomic and molecular density data in the outer midplane of NSTX [Ono et al., Nucl. Fusion 40, 557 (2000)] are inferred from tangential camera data via a forward modeling procedure using the DEGAS 2 Monte Carlo neutral transport code. The observed Balmer-β light emission data from 17 shots during the 2010 NSTX campaign display no obvious trends with discharge parameters such as the divertor Balmer-α emission level or edge deuterium ion density. Simulations of 12 time slices in 7 of these discharges produce molecular densities near the vacuum vessel wall of 2–8 × 10¹⁷ m^–3 and atomic densities ranging from 1 to 7 ×10¹⁶ m^–3; neither has a clear correlation with other parameters. Validation of the technique, begun in an earlier publication, is continued with an assessment of the sensitivity of the simulated camera image and neutral densities to uncertainties in the data input to the model. The simulated camera image is sensitive to the plasma profiles and virtually nothing else. The neutral densities at the vessel wall depend most strongly on the spatial distribution of the source; simulations with a localized neutral source yield densities within a factor of two of the baseline, uniform source, case. Furthermore, the uncertainties in the neutral densities associated with other model inputs and assumptions are ≤ 50%.

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Research Organization:: Lawrence Livermore National Lab., Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344; AC02-09CH11466

OSTI ID:: 1281661

Alternate ID(s):: OSTI ID: 1229611

Report Number(s):: LLNL-JRNL-676315

Journal Information:: Physics of Plasmas, Vol. 22, Issue 8; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 30 works

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