Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session GP11: Poster Session III: In-Person, Hall A (9:30-11:00am) and Virtual Poster Presentations (11:15am-12:30pm)
MFE: DIII-D
Low Temperature Plasma
FUND: Dusty Plasmas; Plasma Sources
9:30 AM - 12:30 PM
Tuesday, October 18, 2022
Room: Exhibit Hall A and Online
Abstract: GP11.00026 : Interpretation of Doppler Shifted Dα Spectroscopy on the DIII-D Neutral Beam System*
Presenter:
Yannick L De Jong
(Eindhoven University of Technology, Eindhoven, Netherlands)
Authors:
Brendan J Crowley
(General Atomics - San Diego)
Yannick L De Jong
(Eindhoven University of Technology, Eindhoven, Netherlands)
Shaun R Haskey
(Princeton Plasma Physics Laboratory)
J T Scoville
(General Atomics - San Diego)
The injected neutral deuterium beam particles (D0) have evolved from their initial birth states of D+ ,D2+, and D3+, through a series of charge exchange and neutralization collisions. Thus on entering the tokamak there exists at least three distinct components of the D0 beam atoms. These components are referred to as full, half, and third energy atomic fractions. Knowledge of the ratio of the components is important for understanding machine performance and interpreting beam-based plasma diagnostics such as CER, MSE and FIDA.
Doppler shifted spectroscopy is a powerful diagnostic tool for analysis of neutral beam sources. The technique relates spectroscopic measurements of Dα photons via an atomic physics model to the beam properties of energy fractions and divergence. The model makes certain assumptions about the processes that lead to the radiative decay of the excited state that gives rise to the Dα light under analysis. Here presented are results of an experiment with the objectives of measuring the energy fractions and examining some of the assumptions made in the atomic physics model.
*This work was supported in part by the U.S. Department of Energy under DE-AC02-09CH11466 and DE-FC02-04ER54698
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