Search NASA⌕ Search
Home/Archive/DOE OSTI

DOE OSTI · 3485991

Multi-diagnostic characterization of neutrals in the confined region of DIII-D using interpretive DEGAS2 simulations

Pratt, Quinn [Princeton Plasma Physics Laboratory] (ORCID:0000000325157787)·Haskey, Shaun R [Princeton Plasma Physics Laboratory] (ORCID:0000000299786597)·Wilkie, George [Princeton Plasma Physics Laboratory] (ORCID:0000000268266273)·Horvath, Laszlo [Princeton Plasma Physics Laboratory] (ORCID:0000000256926772)·Gerrú, Raúl [Massachusetts Institute of Technology, Plasma Science and Fusion Center] (ORCID:0000000218844354)·Ronchi, Gilson [Oak Ridge National Laboratory] (ORCID:0000000330973033)·Groth, Mathias [Aalto University] (ORCID:0000000173971586)
View original source ↗Read source document ↗Export metadata ↓

Abstract

The source did not provide an abstract. Follow the original record for more information.

Keep this discovery

BibTeXRIS

Pratt, Quinn [Princeton Plasma Physics Laboratory] (ORCID:0000000325157787), Haskey, Shaun R [Princeton Plasma Physics Laboratory] (ORCID:0000000299786597), Wilkie, George [Princeton Plasma Physics Laboratory] (ORCID:0000000268266273), Horvath, Laszlo [Princeton Plasma Physics Laboratory] (ORCID:0000000256926772), Gerrú, Raúl [Massachusetts Institute of Technology, Plasma Science and Fusion Center] (ORCID:0000000218844354), Ronchi, Gilson [Oak Ridge National Laboratory] (ORCID:0000000330973033), Groth, Mathias [Aalto University] (ORCID:0000000173971586). 2026-08-20. Multi-diagnostic characterization of neutrals in the confined region of DIII-D using interpretive DEGAS2 simulations. https://doi.org/10.1088/1741-4326/ae9c55

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related reports

DOE OSTI2026

SOLPS-ITER modeling of a dedicated divertor for negative triangularity operation on DIII-D

The design of a new dedicated divertor for negative triangularity (NT) operation on DIII-D with neutral baffles and pumping is informed by SOLPS-ITER transport modeling. This dedicated NT divertor is the latest step in a progression of NT shapes with various divertor characteristics explored on DIII-D, including NT shapes at reduced triangularity and a campaign with stronger shaping that included new armored components on the outboard side. SOLPS simulations played a key role in these divertor designs. Interpretive simulations, using cross-field diffusivities constrained by experimental data in the NT Shelf shape were used to inform the design of the 2023 armor campaign components. A similar procedure used armor campaign data to predict conditions for the dedicated NT divertor. The predictive simulations were used to assess the divertor fluxes, detachment threshold, pumped flux, and neutral leakage. For the dedicated NT divertor, SOLPS simulations and two-point-modeling were used to show the relative impact of magnetic topology (mainly longer connection length) and divertor closure on the divertor conditions relative to the armor campaign. It is predicted that the dedicated NT divertor reaches detachment (measured by target ion flux rollover) at a lower upstream density (≈(1.75−−2.4)×1⁢019m−3) as compared to the armor campaign shape. For the preliminary design geometry, divertor closure reduces the neutral leakage by ≈10%. Parametric optimization indicating further ≈20%–60% improvement in the leakage flux and recycled flux crossing the pump entrance is possible for relatively minor changes to the divertor and baffle layout.

Lore, Jeremy [ORNL] (ORCID:000000029192465X)↗
DOE OSTI2026

Final Report: A Multi-Channel Fusion Product

The goal of this project was to measure charged fusion products from the d(d,p)t reaction in MAST-U plasmas as a function of time and position with good energy resolution using a system of up to six charged particle detectors. The data from this new diagnostic will make it possible to determine the neutral beam ion density profile as a function of R, z, and t with reduced model dependency and contribute new information to a global analysis of fast ion diagnostic data needed for the determination of the fast ion distribution function (velocity space tomography).

70 PLASMA PHYSICS AND FUSION TECHNOLOGY↗
DOE OSTI2024

Cross-scale interaction between microturbulence and meso-scale reversed shear Alfvén eigenmodes in DIII-D plasmas

Abstract This paper reports global nonlinear gyrokinetic simulations that couple meso-scale reversed shear Alfvén eigenmodes (RSAEs) driven by energetic particles (EPs) and ion temperature gradient (ITG) microturbulence driven by thermal plasma, using equilibrium and profiles from DIII-D discharge #159243. In simulations focusing only on the ITG, electrostatic ITG drives a huge thermal ion heat transport, which is reduced by a factor of 10 to a level close to the experimental value in electromagnetic simulation due to finite β effect. In the simulations coupling the RSAE and ITG, ITG can scatter the resonant EP nonlinearly trapped by the RSAE and damp the zonal flows generated by the RSAE. The regulation of the RSAE by the ITG greatly reduces the initial saturation amplitude of the RSAE but increases the RSAE amplitude and associated EP transport to experimental levels in the quasi-steady state. The RSAE effects on the ITG, specifically the stronger zonal flows generated by the RSAE and the RSAE frequency modulation of the ITG-induced thermal ion heat transport, in turn, leads to a reduction of the thermal ion heat transport by more than a factor of 2 . For a stronger background ITG, the regulation of the RSAE by the ITG is stronger, while the RSAE effects on the ITG are weaker. This work highlights the importance of cross-scale coupling in the dynamics of the AE turbulence and EP transport.

Physics↗