Bayesian experimental design of a multichannel interferometer for Wendelstein 7-X.

Comparative studies to the design of the interferometer at W7-X with respect to technical boundary conditions

For the optimisation of the beam line configuration of the multi-channel interferometer at the Wendelstein 7-X stellarator the probabilistic approach of Bayesian experimental design (BED) is applied. Parameters of physical interest are directly implemented as design criteria. The quality of the design is analysed according to its expected information gain (expected utility) about the parameters...

A New Dispersion Interferometer for the Stellarator Wendelstein 7-X

Design and Calibration of a Polychromator for the Thomson Scattering at Wendelstein 7-X

On Wendelstein 7-X, electron density and electron temperature profiles are planned to be measured by Thomson scattering. The specific system employs fiber bundles for the scattered light which is detected by means of a five-channel polychromator system. The detection system is assembled and its components are characterized. A calibration technique employing a super-continuum light source is ass...

Commissioning of the magnetic diagnostics during the first operation phase at Wendelstein 7-X

during the first operation phase at Wendelstein 7-X K. Rahbarnia1, T. Andreeva1, A. Cardella2, B.B. Carvalho3, M. Endler1, D. Hathiramani1, J. Geiger1, O. Grulke1, S. Lazerson4, U. Neuner1, J. Svensson1, H. Thomsen1, A. Werner1 and Wendelstein 7-X Team 1 Max-Planck Institute for Plasma Physics, Wendelsteinstr. 1, 17489 Greifswald, Germany 2 Fusion for Energy, Boltzmannstr. 2, 85748 Garching, Ge...

A hybrid fluid–kinetic approach for 3D plasma edge transport in He-plasma at Wendelstein 7-X

Introduction The complex three-dimensional structure of the optimised stellarator Wendelstein 7-X can only partially be accessed by means of experimental measurements, as a consequence of the only quite limited number of measurements at distinct locations with different plasma crosssections and properties. This highlights the importance of precise modelling (i.e. numerical bookkeeping) as an ex...