Greifswald 2024 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 7: Magnetic Confinement III
P 7.4: Vortrag
Dienstag, 27. Februar 2024, 12:00–12:15, ELP 6: HS 3
Fast 2D ne and Te profile measurements with the divertor helium beam at ASDEX Upgrade — •Sebastian Hörmann1,2, Marco Cavedon3, Michael Griener1, Daniel Wendler1,2, Ulrich Stroth1,2, and The ASDEX Upgrade team4 — 1Max-Planck-Institut für Plasmaphysik, Garching — 2Physik-Department E28, Technische Universität München, 85747 Garching, Germany — 3Dipartimento di Fisica "G. Occhialini", Università di Milano-Bicocca, Milano, Italy — 4See author list of U. Stroth et al. 2022 Nucl. Fusion 62 042006
The divertor is an important element to achieve magnetic confinement fusion, reducing the impurity content of the core plasma and increasing the pumping efficiency. Too high heat loads on the target plates of the divertor can be mitigated by a layer of neutral gas which forms in front of the target plates, such a state is called detachment. To study the condition of the divertor and the detachment process, a new thermal helium beam diagnostic with high spatiotemporal resolution has been installed in the outer divertor of ASDEX Upgrade. It is capable to measure two-dimensional electron density, temperature and hence pressure profiles by means of a collisional radiative model. This makes it possible for the first time to observe the change in these profiles from an attached to a partially detached divertor state on a fast time scale and therefore contribute to the understanding of the dynamics during this transition. In particular, the movement of the detachment front and divertor plasma oscillations during the transition to detachment are presented within this contribution.
Keywords: magnetic confinement; divertor; detachment; 2D plasma profiles; helium beam