06/13/2024

Manuel Herschel investigated the dispersion behavior of the weak coherent mode (WCM) in I-modes in ASDEX Upgrade. The WCM propagating in the electron-diamagnetic direction is in agreement with the dispersion relation of drift waves if temperature fluctuations can be neglected. This confirms important assumptions in our theory. The paper was recently published in Nuclear Fusion.  

06/10/2024
Today Tobias Tork defended his master thesis with the topic 'Estimation of turbulent transport coefficients from single point density fluctuations'. In his master thesis Tobias Tork has developed a method that allows to determine transport coefficients of particles and heat transport in fusion plasmas only from measurements of density or temperature fluctuations via conditioning. The method was validated by means of gyrofluid simulations and experiments in ASDEX Upgrade and Wendelstein 7-X. The method allows simple and quite precise estimation of the transport coefficients with existing diagnostics. We believe that this may represent a methodological breakthrough. Special thanks at this point also to Nicolas Bian for the great idea, Felix Reimold for the great support at IPP Greifswald, Carsten Killer and Gustavo Grenfell for the measurement data from W7-X and AUG and Dirk Reiser for numerical support.  

On April 3rd we had Dr. Stegmeir and on May 10th Dr. Grover from IPP Garching as guests in our working group. We would like to thank them for their interest and hope for a good future cooperation.