L. Rudischhauser
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View article: Demonstration of Power Exhaust Control by Impurity Seeding in the Island Divertor at Wendelstein 7-X
Demonstration of Power Exhaust Control by Impurity Seeding in the Island Divertor at Wendelstein 7-X Open
Effective power exhaust by impurity seeding and its dependence on the gas species used was demonstrated in island divertor configurations for the first time at Wendelstein 7-X (W7-X). A systematic set of experiments has been conducted duri…
View article: Radiation characteristics of detached divertor plasmas in W7-X
Radiation characteristics of detached divertor plasmas in W7-X Open
Detached divertor plasmas has been achieved by density ramp in W7-X. During the transition into detachment, the main divertor radiation region moves from the region close to the divertor targets to the region around LCFS. The typical spati…
View article: Analysis of hydrogen fueling, recycling, and confinement at Wendelstein 7-X via a single-reservoir particle balance
Analysis of hydrogen fueling, recycling, and confinement at Wendelstein 7-X via a single-reservoir particle balance Open
A single-reservoir particle balance for the main plasma species hydrogen has been established for W7-X. This has enabled the quantitative characterization of the particle sources in the standard island divertor configuration for the first …
View article: Plasma-wall interaction studies in W7-X: main results from the recent divertor operations
Plasma-wall interaction studies in W7-X: main results from the recent divertor operations Open
Wendelstein 7-X (W7-X) is an optimized stellarator with a 3-dimensional five-fold modular geometry. The plasma-wall-interaction (PWI) investigations in the complex 3D geometry of W7-X were carried out by in situ spectroscopic observations,…
View article: Plasma radiation behavior approaching high-radiation scenarios in W7-X
Plasma radiation behavior approaching high-radiation scenarios in W7-X Open
The W7-X stellarator has so far performed experiments under both limiter and divertor conditions. The plasma is mostly generated by ECR-heating with powers up to 6.5 MW, and the plasma density is usually limited by the radiation losses fro…
View article: Bolometer tomography on Wendelstein 7-X for study of radiation asymmetry
Bolometer tomography on Wendelstein 7-X for study of radiation asymmetry Open
The algorithm for bolometer tomography at Wendelstein 7-X (W7-X) has been recently improved using a novel regularization functional, based on relative gradient smoothing (RGS) of the sought radiation profile. It has been validated using ra…
View article: First attempt to quantify W7-X island divertor plasma by local experiment-model comparison
First attempt to quantify W7-X island divertor plasma by local experiment-model comparison Open
As a complement to our recent work, which focused on understanding the basic detachment physics and general experimental and numerical trends observed in the W7-X island divertor, this paper compares EMC3-Eirene simulation results with dif…
View article: Understanding detachment of the W7-X island divertor
Understanding detachment of the W7-X island divertor Open
The fundamental behavior of the W7-X island divertor under detached conditions, which has been theoretically predicted with the EMC3-Eirene code, is re-examined here under the experimental conditions achieved so far and compared with the f…
View article: Integrated modelling: Coupling of surface evolution and plasma-impurity transport
Integrated modelling: Coupling of surface evolution and plasma-impurity transport Open
During the interaction of the scrape off layer (SOL) plasma with the first wall the evolution of both wall and plasma are tightly coupled: The erosion of the first wall leads to an impurity concentration in the plasma which affects the par…
View article: Stable heat and particle flux detachment with efficient particle exhaust in the island divertor of Wendelstein 7-X
Stable heat and particle flux detachment with efficient particle exhaust in the island divertor of Wendelstein 7-X Open
The island divertor concept is an innovative and promising idea to handle heat and particle exhaust in stellarators. At the Wendelstein 7-X (W7-X) stellarator, this divertor concept plays a central role in the device mission to demonstrate…
View article: The Langmuir probe system in the Wendelstein 7-X test divertor
The Langmuir probe system in the Wendelstein 7-X test divertor Open
The design and evaluation of the Langmuir probe system used in the first divertor operation phase of Wendelstein 7-X is described. The probes are integrated into the target plates and have individually facetted surfaces to keep the angle o…
View article: Plasma filaments in the scrape-off layer of Wendelstein 7-X
Plasma filaments in the scrape-off layer of Wendelstein 7-X Open
Plasma filaments have been observed by reciprocating electric probes in the Scrape-Off Layer (SOL) of the Wendelstein 7-X stellarator. Comparison with target probes indicates that a filament observed in the W7-X SOL extends to the sheath. …
View article: Drift effects on W7-X divertor heat and particle fluxes
Drift effects on W7-X divertor heat and particle fluxes Open
Classical particle drifts are known to have substantial impacts on fluxes of particles and heat through the edge plasmas in both tokamaks and stellarators. Here we present results from the first dedicated investigation of drift effects in …
View article: Effect of toroidal plasma currents on the Wendelstein 7-X Scrape-Off Layer
Effect of toroidal plasma currents on the Wendelstein 7-X Scrape-Off Layer Open
The role of toroidal plasma currents for the island divertor scrape-off layer in the stellarator Wendelstein 7-X is investigated using reciprocating electric probes. Experiments show that small amounts (of a few kA) of plasma current are s…
View article: Features of near and far scrape-off layer heat fluxes on the Wendelstein 7-X inboard limiters
Features of near and far scrape-off layer heat fluxes on the Wendelstein 7-X inboard limiters Open
The power fall-off length is used as a characteristic dimension to describe the power exhaust in the scrape-off layer (SOL) in magnetic confinement fusion devices. Measurements from the limiter campaign of the stellarator Wendelstein 7-X w…
View article: Tuning of the rotational transform in Wendelstein 7-X
Tuning of the rotational transform in Wendelstein 7-X Open
The control of rotational transform in Wendelstein 7-X (W7-X) is key to both the island divertor operation and safety of plasma facing components. The island divertor concept in W7-X relies on an edge flux surface with rotational transform…
View article: First divertor physics studies in Wendelstein 7-X
First divertor physics studies in Wendelstein 7-X Open
The Wendelstein 7-X (W7-X) optimized stellarator fusion experiment, which went into operation in 2015, has been operating since 2017 with an un-cooled modular graphite divertor. This allowed first divertor physics studies to be performed a…