Absolute electron density fluctuation reconstruction for two-dimensional hydrogen beam emission spectroscopy

Lampert, Mate

doi:10.1063/5.0174362

Absolute electron density fluctuation reconstruction for two-dimensional hydrogen beam emission spectroscopy

Journal Article · Thu Nov 30 23:00:00 EST 2023 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/5.0174362· OSTI ID:2282121

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Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Scrape-off layer (SOL) and edge plasma turbulence significantly contribute to the radial particle and heat transport, lowering the plasma confinement and increasing the heat load on the plasma facing components. SOL turbulence is predominantly intermittent, which manifests in the occurrence of isolated density filaments or blobs. Filaments propagate radially outward toward plasma facing components, limiting their lifetime by erosion and sputtering. To characterize this phenomenon in detail, few diagnostic techniques are available. Beam emission spectroscopy is a diagnostic capable of measuring plasma turbulence in both SOL and edge plasmas. Due to the finite lifetime of the excitation states during the beam–plasma interaction and the misalignment between the optics and the magnetic field, spatial smearing is introduced in the measurement. In this paper, a novel method is introduced to overcome this hindering effect by inverting the fluctuation response matrix on an optimally smoothed signal. We show that this method is fast and provides significantly more accurate absolute density fluctuation reconstruction than the direct inversion technique. Here, the presented method is usable for all types of beam emission diagnostics where the spatial resolution is higher than the combined smearing of the atomic physics and the observation.

View Accepted Manuscript (DOE)

Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 2282121

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 12 Vol. 94; ISSN 0034-6748

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

Country of Publication:: United States

Language:: English

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47 OTHER INSTRUMENTATION
Tokamaks
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plasma confinement
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Absolute electron density fluctuation reconstruction for two-dimensional hydrogen beam emission spectroscopy

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