— News: 2020-01-07

Happy New Year 2020 – which welcomes a new PhD: Thierry Kremeyer.

On December 13, 2019 Thierry Kremeyer defended his thesis “Particle Fueling and Exhaust in the Wendelstein 7-X Island Divertor”. This work, funded by the office of Fusion Energy Sciences in the Department of Energy under grant DE-SC0014210 features two accomplishments: one is the development, qualification and successful fielding of the Wisconsin In-Situ Penning (WISP) gauges. Thierry used this specifically developed diagnostic to study helium exhaust in the Island Divertor at W7-X. The second main product of the thesis is the establishment of a single reservoir, global particle balance to study hydrogen fueling and exhaust and calculate the global particle confinement time of hydrogen. With these analysis and diagnostic inventions, Thierry showed for the first time that helium is efficiently collected in the island divertor and that the particle confinement time for hydrogen increases after the transition into detachment. The findings laid ground for detailed follow up studies. They will be conducted by thirty, who stays as a post doctoral researcher in the group and a student focusing on EMC3-EIRENE modeling of neutral particle dynamics in W7-X. Congratulations to Thierry!

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This is the group webpage for plasma edge physics and plasmas surface interactions in presence of three-dimensional (3D) plasma boundaries.Plasma edge layer at ITER transformed into a 3D system by application of small amplitude, external magnetic control fields.

This is a situation relevant to tokamak devices with resonant magnetic field perturbations applied and stellarators as inherently 3D systems.

We tackle the cutting edge topics in the field on large-scale facilities and address important basic plasma science questions such as generation of high-density plasmas with helicon waves. The later topic has become relevant recently for next-generation wakefield accelerators and we are a member of the AWAKE project at CERN.

We post the most recent developments in the group on this side – including recent scientific achievements, lab updates and publication updates.

An overview of group members and actual topics and devices can be found here.

Interested? Join the team!

Contact: Professor Oliver Schmitz

oschmitz@wisc.edu | +1 (608) 263 1547