University of Wisconsin–Madison

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– News: 2018-06-04

August issue of Nature Physics with title story on Wendelstein 7-X paper co-authored by UW Madison researchers.

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The title story of the August 2018 issue of Nature Physics is based on a paper co-authored by personnel of the 3D-PSI group at UW Madison. In the paper by A. Dinklage et al. on “Magnetic Confinement Effects on the Wendelstein 7-X stellarator” an overview is presented on scenario and performance accomplishments during the startup campaign of this brand new stellarator device. Highlights are that a scaling of the energy confinement matching H-mode confinement in tokamaks was seen and record electron and ion temperatures were reached. Also, the first campaign provided clear evidence for small bootstrap currents in W7-X plasmas – a design criterion which is of seminal importance for a stable island divertor solution. PhD students and researchers from the 3D-PSI group were involved in gathering the material presented related to the plasma edge and divertor properties.

The next campaign is presently commencing with the participation of three graduate students, one postdoctoral researcher, one assistant scientist and Prof. Schmitz. In this campaign, higher device performance is expected as the island divertor is now installed and a controlled plasma-material interface will be established.

This work is funded by. the U.S. Department of Energy under grant DE-SC0014210 and by funding of the College of Engineering and the Department of Engineering Physics at the University of Wisconsin-Madison. 

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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