The deuterium experiment starts from March 2017 on the Large Helical Device (LHD). The deuterium experiment is a part of LHD performance upgrade project, including the upgrade of heating devices, the installation of closed helical diverter and the upgrade for diagnostic systems. The objectives of the deuterium experiment are:
- to realize high-performance plasmas in helical systems by...
The H-1 flexible heliac is a medium-sized helical axis stellarator of major radius R=1m, and average minor radius <r> $ \simeq 0.15-0.2$ m. Precise control of the ratio $k_h$ of the helical winding current to the ring coil current provides access to a wide range of magnetic configurations. This provides rotational transform $\bar\iota$ in the range $0.9 < \bar\iota < 1.5$ for $B_0 <...
In tokamaks the intimate relationship between plasma performance and materials used at the first wall and divertor are recognized but not well understood. More so, in stellarators, the role of plasma material interactions has not been as rigorously pursued since the optimization of the confinement properties has been the mian focus. However with the next generation of stellarators and tokamaks...
During the first operational phase (OP1.1) of Wendelstein 7-X (W7-X) electron cyclotron resonance heating (ECRH) was the exclusive heating method, and it will also remain dominant in the next operational campaign (OP1.2). The microwaves are provided by ten gyrotrons (140GHz, 1MW), which were developed within the PMW-project at KIT. The ECRH-system is also the only heating system able to...
The largest modular stellarator Wendelstein 7-X (W7-X) has successfully passed first phase of operation in Greifswald, Germany. The sophisticated W7-X superconducting magnet system with its non-linear support system has been carefully monitored using an extensive set of mechanical and temperature sensors. The paper focuses on detail consideration of cyclic magnet system behavior during...
The work studies the potential and limitations of additively manufactured (AM) stellarators deduced from recent experimental works.
High geometric complexity with high accuracy required for stellarator components (so high cost) delays the construction of new stellarators and the related research. Additive manufacturing (AM) is particularly suited to high geometrical complexity at moderate...
