Towards a new image processing system at Wendelstein 7-X: From spatial calibration to characterization of thermal events

Wendelstein 7-X (W7-X) is the most advanced fusion experiment in the stellarator line and is aimed at proving that the stellarator concept is suitable for a fusion reactor. One of the most important issues for fusion reactors is the monitoring of plasma facing components when exposed to very high heat loads, through the use of visible and infrared (IR) cameras. In this paper, a new image processing system for the analysis of the strike lines on the inboard limiters from the first W7-X experimental campaign is presented. This system builds a model of the IR cameras through the use of spatial calibration techniques, helping to characterize the strike lines by using the information given by real spatial coordinates of each pixel. The characterization of the strike lines is made in terms of position, size, and shape, after projecting the camera image in a 2D grid which tries to preserve the curvilinear surface distances between points. The description of the strike-line shape is made by means of the Fourier Descriptors

Forward modeling of collective Thomson scattering for Wendelstein 7-X plasmas: Electrostatic approximation

In this paper, we present a method for numerical computation of collective Thomson scattering (CTS). We developed a forward model, eCTS, in the electrostatic approximation and benchmarked it against a full electromagnetic model. Differences between the electrostatic and the electromagnetic models are discussed. The sensitivity of the results to the ion temperature and the plasma composition is demonstrated. We integrated the model into the Bayesian data analysis framework Minerva and used it for the analysis of noisy synthetic data sets produced by a full electromagnetic model. It is shown that eCTS can be used for the inference of the bulk ion temperature. The model has been used to infer the bulk ion temperature from the first CTS measurements on Wendelstein 7-X

Ueber die Eigenart der Mikrostandorte im Fussbereich der Altbuchen unter besonderer Beruecksichtigung der Schwermetallgehalte in der organischen Auflage und im Oberboden

SIGLETIB: RO 2404 (9) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Ueber die Eigenart der Mikrostandorte im Fussbereich der Altbuchen unter besonderer Beruecksichtigung der Schwermetallgehalte in der organischen Auflage und im Oberboden. Eine vegetations- und landschaftsoekologische Studie

Available from the library of Kassel Univ. (Gesamthochschule) (DE) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Kleinraeumige Verteilung der pflanzenaufnehmbaren Mineralstoffe in den vom Stammablaufwasser beeinflussten Bodenbereichen alter Buchen verschiedener Waldgesellschaften

Lecture of a colloquium in DuesseldorfTIB: in RO 1677 (3) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Schwermetallakkumulation, Aluminiumfreisetzung und Streuabbauverzoegerung in den vom Stammablaufwasser gepraegten Bodenbereichen alter Buchen und ihre Auswirkungen auf den Pflanzenbewuchs Schlussbericht

Copy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman