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