E. Flom
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View article: Stellarator fusion systems enabled by arrays of planar coils
Stellarator fusion systems enabled by arrays of planar coils Open
We present an overview of a novel electromagnetic coil configuration for stellarators and its application to two near-term fusion systems. The novel coil configuration is the planar coil stellarator, able to implement precisely-quasisymmet…
View article: First experimental confirmation of island SOL geometry effects in a high radiation regime on W7-X
First experimental confirmation of island SOL geometry effects in a high radiation regime on W7-X Open
This work characterizes the detachment behavior and radiation characteristics of the low iota configuration in the Wendelstein 7-X (W7-X) stellarator. The island scrape-off layer (SOL) of the low iota has a poloidal mode number of six isla…
View article: Overview of the first Wendelstein 7-X long pulse campaign with fully water-cooled plasma facing components
Overview of the first Wendelstein 7-X long pulse campaign with fully water-cooled plasma facing components Open
After a long device enhancement phase, scientific operation resumed in 2022. The main new device components are the water cooling of all plasma facing components and the new water-cooled high heat flux divertor units. Water cooling allowed…
View article: Charge exchange recombination spectroscopy on the alkali beam of Wendelstein 7-X
Charge exchange recombination spectroscopy on the alkali beam of Wendelstein 7-X Open
Measurements of ion temperature profiles are required to assess the energy and particle transport processes in the Wendelstein 7-X stellarator. This device is equipped with a diagnostic alkali beam, which can be utilized to determine local…
View article: Observation of a drift-driven local transport regime in the island divertor of Wendelstein 7-X
Observation of a drift-driven local transport regime in the island divertor of Wendelstein 7-X Open
Measurements of the poloidal electron density and temperature distribution in the W7-X island divertor reveal the existence of two distinct scrape-off layer transport regimes. At low and intermediate densities, $T_e$ profiles across the ma…
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: 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: Measurements of plasma parameters in the divertor island of Wendelstein 7-X through line-ratio spectroscopy on helium
Measurements of plasma parameters in the divertor island of Wendelstein 7-X through line-ratio spectroscopy on helium Open
We report electron temperature Te and density ne have been measured in the divertor island of Wendelstein 7-X by means of a new thermal He-beam system utilizing line-ratio spectroscopy. This system is equipped with a poloidal arrangement o…
View article: The He/Ne beam diagnostic for line-ratio spectroscopy in the island divertor of Wendelstein 7-X
The He/Ne beam diagnostic for line-ratio spectroscopy in the island divertor of Wendelstein 7-X Open
a versatile gas injection system and an absolute calibrated spectroscopic observation system with more than 200 lines-of-sight have been installed in two divertor locations in the Wendelstein 7-X stellarator. This powerful setup enables am…