Doppler coherence imaging of divertor and SOL flows in ASDEX upgrade and Wendelstein 7-X

Gradic, D.; Ford, O. P.; Burckhart, A.; Effenberg, F.; Frerichs, H.; König, R.; Lunt, T.; Perseo, V.; Wolf, R. C.

doi:10.1088/1361-6587/aac4d2

Title: Doppler coherence imaging of divertor and SOL flows in ASDEX upgrade and Wendelstein 7-X

Journal Article · 18 June 2018 · Plasma Physics and Controlled Fusion

DOI: https://doi.org/10.1088/1361-6587/aac4d2 · OSTI ID:1499869

^[1]; Ford, O. P.; Burckhart, A.; Effenberg, F.; Frerichs, H.; König, R.; Lunt, T.; Perseo, V.; Wolf, R. C.

OSTI

Measurement of ion dynamics is of great importance to the study of plasma exhaust and impurity particle flows in the scrape-off-layer (SOL) and divertor in magnetic confinement experiments. Doppler coherence imaging spectroscopy (CIS) is a passive optical diagnostic that produces 2D images of line-integrated ion flow velocity. Doppler CIS flow measurements of neutral deuterium and impurities were conducted for the first time in the divertor of the medium-sized tokamak experiment ASDEX Upgrade. A detailed sightline, emission and magnetic field analysis was undertaken to identify location and direction of flows. Under the assumption of toroidal axisymmetry, they revealed mainly parallel impurity flows in the proximity of the X-point and target plates on the order of 20 km s^-1. Two Doppler CIS systems are currently set up for the optimized stellarator Wendelstein 7-X (W7-X). With this being said, the main task of this diagnostic will be the measurement of impurity ion flows in one of the island divertors of W7-X. EMC3-EIRENE simulations have been carried out to estimate the flow behaviour in the W7-X SOL.

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Research Organization:: Univ. of Wisconsin, Madison, WI (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: ASDEX Upgrade Team; Eurofusion MST1 team; Wendelstein 7-X Team

Grant/Contract Number:: SC0014210

OSTI ID:: 1499869

Journal Information:: Plasma Physics and Controlled Fusion, Journal Name: Plasma Physics and Controlled Fusion Journal Issue: 8 Vol. 60; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Coherence imaging spectroscopy at Wendelstein 7-X for impurity flow measurements Perseo, Valeria; Gradic, Dorothea; König, Ralf Review of Scientific Instruments, Vol. 91, Issue 1 https://doi.org/10.1063/1.5126098	journal	January 2020
Roadmap on photonic, electronic and atomic collision physics: II. Electron and antimatter interactions Schippers, Stefan; Sokell, Emma; Aumayr, Friedrich Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 52, Issue 17 https://doi.org/10.1088/1361-6455/ab26e0	journal	August 2019
First demonstration of radiative power exhaust with impurity seeding in the island divertor at Wendelstein 7-X Effenberg, F.; Brezinsek, S.; Feng, Y. Nuclear Fusion, Vol. 59, Issue 10 https://doi.org/10.1088/1741-4326/ab32c4	journal	August 2019
Direct measurements of counter-streaming flows in a low-shear stellarator magnetic island topology Perseo, V.; Effenberg, F.; Gradic, D. Nuclear Fusion, Vol. 59, Issue 12 https://doi.org/10.1088/1741-4326/ab4320	journal	September 2019

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