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— News: 2017-03-15

Paper by Prof. O. Schmitz on comparative studies on Helium exhaust with RMP fields at TEXTOR (tokamak) and LHD (heliotron/stellarator) was selected as highlight for 2016 in the IoP journal Nuclear Fusion.

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The paper on “Enhancement of helium exhaust by resonant magnetic perturbation fields at LHD and TEXTOR” was selected as a 2016 highlight in the top-journal Nuclear Fusion. The paper demonstrates for the first time that small amplitude, resonant magnetic perturbation (RMP) fields are a versatile and efficient fine-tuning actuator to control the helium exhaust from a magnetically confined plasma. Helium will be produced in future fusion reactors as ash of the fusion process and needs to be exhausted efficiently to maintain a burning plasma. In the paper it is shown that for the two leading configurations, i.e. a tokamak and stellarator plasma, helium exhaust can be controlled and substantially enhanced by these fine scale external magnetic fields. The study has motivated recent follow up experiments at the U.S. National Fusion facility DIII-D, in which such small scale magnetic fields are used for control of the plasma edge stability. The findings discussed in the paper suggest that enhanced helium exhaust is another beneficial aspect of these additional magnetic fields – a very important finding also for ITER, the next step fusion experiment presently under construction in southern France.

This work was funded by the U.S. Department of Energy under Early Career Grant DE-SC00013911.

— News: 2017-03-12

Paper by Dr. H. Frerichs on NSTX-U modeling with EMC3-EIRENE among most read paper for 2016  in the top journal Physics of Plasmas 

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The paper on “Exploration of magnetic perturbation effects on advanced divertor configurations in NSTX-U” by Dr. H. Frerichs was added to the selection list of Physics of Plasma for 2016. The paper presents a first time systematic exploration of divertor conditions in the various advanced divertor configurations accessible at NSTX-U including the effects of resonant magnetic perturbation fields. This work was funded by the Department of Energy under funding DE-SC0012315.

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

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

Interested? Join the team!

Contact: Assistant Professor Oliver Schmitz

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