Doppler coherence imaging of divertor and SOL flows in ASDEX upgrade and Wendelstein 7-X
Abstract
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.
- Publication Date:
- Research Org.:
- Univ. of Wisconsin, Madison, WI (United States)
- Sponsoring Org.:
- USDOE
- Contributing Org.:
- ASDEX Upgrade Team; Wendelstein 7-X Team; Eurofusion MST1 team
- OSTI Identifier:
- 1499869
- Grant/Contract Number:
- SC0014210
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Plasma Physics and Controlled Fusion
- Additional Journal Information:
- Journal Volume: 60; Journal Issue: 8; Journal ID: ISSN 0741-3335
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Gradic, D., Ford, O. P., Burckhart, A., Effenberg, F., Frerichs, H., König, R., Lunt, T., Perseo, V., and Wolf, R. C. Doppler coherence imaging of divertor and SOL flows in ASDEX upgrade and Wendelstein 7-X. United States: N. p., 2018.
Web. doi:10.1088/1361-6587/aac4d2.
Gradic, D., Ford, O. P., Burckhart, A., Effenberg, F., Frerichs, H., König, R., Lunt, T., Perseo, V., & Wolf, R. C. Doppler coherence imaging of divertor and SOL flows in ASDEX upgrade and Wendelstein 7-X. United States. https://doi.org/10.1088/1361-6587/aac4d2
Gradic, D., Ford, O. P., Burckhart, A., Effenberg, F., Frerichs, H., König, R., Lunt, T., Perseo, V., and Wolf, R. C. Tue .
"Doppler coherence imaging of divertor and SOL flows in ASDEX upgrade and Wendelstein 7-X". United States. https://doi.org/10.1088/1361-6587/aac4d2. https://www.osti.gov/servlets/purl/1499869.
@article{osti_1499869,
title = {Doppler coherence imaging of divertor and SOL flows in ASDEX upgrade and Wendelstein 7-X},
author = {Gradic, D. and Ford, O. P. and Burckhart, A. and Effenberg, F. and Frerichs, H. and König, R. and Lunt, T. and Perseo, V. and Wolf, R. C.},
abstractNote = {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.},
doi = {10.1088/1361-6587/aac4d2},
journal = {Plasma Physics and Controlled Fusion},
number = 8,
volume = 60,
place = {United States},
year = {Tue Jun 19 00:00:00 EDT 2018},
month = {Tue Jun 19 00:00:00 EDT 2018}
}
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Works referencing / citing this record:
Direct measurements of counter-streaming flows in a low-shear stellarator magnetic island topology
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- Nuclear Fusion, Vol. 59, Issue 12
Roadmap on photonic, electronic and atomic collision physics: II. Electron and antimatter interactions
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First demonstration of radiative power exhaust with impurity seeding in the island divertor at Wendelstein 7-X
journal, August 2019
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- Nuclear Fusion, Vol. 59, Issue 10
Coherence imaging spectroscopy at Wendelstein 7-X for impurity flow measurements
journal, January 2020
- Perseo, Valeria; Gradic, Dorothea; König, Ralf
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