Erlangen 2018 – wissenschaftliches Programm

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AKjDPG: Arbeitskreis junge DPG

AKjDPG 1: Tutorial Plasma Physics

AKjDPG 1.1: Tutorium

Sonntag, 4. März 2018, 16:00–16:45, K 1.011

Introduction into physics of Wendelstein 7-X — •Sergey Bozhenkov and W7-X team — Max-Planck-Intitut für Plasmaphysik, Greifswald, Germany

This tutorial will give an overview of active stellarator research topics, including an explanation of stellarator optimization, an introduction into the physics of Wendelstein 7-X (W7-X) and a thorough presentation of its experimental results so far. A high quality of magnetic flux surfaces necessary for confinement and compensation of remaining errors are demonstrated. The plasma initiation and heating to multi-keV temperatures are provided by electron cyclotron resonance heating with presently available power up to 7 MW. The power exhaust and the plasma wall interaction are defined by an island divertor with inertially cooled graphite targets, which already makes possible plasma operation with the heating power of 2 MW for 30 s. A good diagnostic coverage allows first tests of the W7-X optimization as well as, for example, first measurements of the plasma turbulence. In future, with adding more heating power and ion heating schemes, the program will also include studies of the MHD stability at high plasma pressures and confinement of fast ions. Installation of the water-cooled divertor targets will allow high power plasma discharges (10 MW) lasting up to 30 minutes. The aim is to show that a stellarator fusion reactor is viable. The advantages would be steady state operation and absence of large scale instabilities (disruptions).