Doppler coherence imaging of divertor and SOL flows in ASDEX upgrade and Wendelstein 7-X
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.
- Research Organization:
- Univ. of Wisconsin, Madison, WI (United States)
- Sponsoring Organization:
- USDOE
- Contributing Organization:
- ASDEX Upgrade Team; Wendelstein 7-X Team; Eurofusion MST1 team
- Grant/Contract Number:
- SC0014210
- OSTI ID:
- 1499869
- Journal Information:
- Plasma Physics and Controlled Fusion, Vol. 60, Issue 8; ISSN 0741-3335
- Publisher:
- IOP ScienceCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Direct measurements of counter-streaming flows in a low-shear stellarator magnetic island topology
|
journal | September 2019 |
Roadmap on photonic, electronic and atomic collision physics: II. Electron and antimatter interactions
|
journal | August 2019 |
First demonstration of radiative power exhaust with impurity seeding in the island divertor at Wendelstein 7-X
|
journal | August 2019 |
Coherence imaging spectroscopy at Wendelstein 7-X for impurity flow measurements
|
journal | January 2020 |
Similar Records
2D measurements of parallel counter-streaming flows in the W7-X scrape-off layer for attached and detached plasmas
Numerical investigation of plasma edge transport and limiter heat fluxes in Wendelstein 7-X startup plasmas with EMC3-EIRENE