000K utf8 1100 $c2003 1500 eng 2050 urn:nbn:de:gbv:8-diss-7436 3000 Lechte, Carsten 4000 Microscopic structure of plasma turbulence in the torsatron TJ-K$hChristian-Albrechts-Universität zu Kiel [Lechte, Carsten] 4030 Kiel$nChristian-Albrechts-Universität zu Kiel 4209 Plasma turbulence is characterised by the fluctuation of density, potential and temperature on all temporal and spatial scales. In magnetically confined plasmas, turbulence causes an increased particle and heat transport across the magnetic field lines. The focus of this work is the experimental investigation of density and potential fluctuations and the resulting turbulent transport. A poloidal Langmuir probe array with 64 tips is employed to investigate turbulence in the confinement region at all spatial scales. A dependence on the drift scale rho_s is found. The cross phase between density and potential fluctuations is near zero, indicating drift wave turbulence. This result is also found in simulations. Finally, the conditional averaging method was used to detect the spatio-temporal structure of turbulent events with simple two probe measurements. The results are in agreement with the results from the probe array. 4950 https://nbn-resolving.org/urn:nbn:de:gbv:8-diss-7436$xR$3Volltext$534 4961 https://macau.uni-kiel.de/receive/diss_mods_00000743 5051 530 5550 conditional averaging 5550 confined 5550 drift wave 5550 Fusionsplasma 5550 magnetised 5550 mhd 5550 plasma 5550 Plasma 5550 probe array 5550 scaling 5550 turbulence 5550 Turbulente Strömung