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Electrostatic Probe Study of Plasma Radial Profiles in Gomtraic Experiment

This study, conducted in 2012/2013 in Prague, focused on analyzing plasma radial profiles using an electrostatic probe supervised by Jana Brotankova. The research involved measuring floating potential, ion saturation current, and electrical fields at various radial positions. Results showed inconsistent behaviors in different plasma regimes, emphasizing the importance of probe orientation and safe depth. Conclusions highlighted the need for caution when interpreting data from Langmuir probe angles and the polar dependence of radial profiles. The study underscores the significance of understanding the behavior of plasma in different regions and the potential risks associated with probes disturbing the plasma.

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Electrostatic Probe Study of Plasma Radial Profiles in Gomtraic Experiment

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  1. 2012/2013 Golem, Prague GOMTRAIC ElectrostaticProbe Supervisor: JanaBrotankova

  2. 1. Theprobe

  3. 2. Radial Profile A. FloatingPotential Notconsistent

  4. 2. Radial Profile A. FloatingPotential

  5. 2. Radial Profile A. FloatingPotential

  6. 2. Radial Profile A. FloatingPotential t t+5ms

  7. 2. Radial Profile A. FloatingPotential – Electrical Field Notconsistent

  8. 2. Radial Profile A. FloatingPotential – PoloidalVelocity Notconsistent

  9. 2. Radial Profile A. FloatingPotential – PoloidalVelocity t+5ms t

  10. 2. Radial Profile B. IonSaturationCurrent Probe disturbing the plasma

  11. 2. Radial Profile B. IonSaturationCurrent t t+5ms

  12. 3. ProbeOrientation A. IonSaturationCurrent Mess 1st day 2nd day

  13. 3. ProbeOrientation A. IonSaturationCurrent 2nd day t+2ms t

  14. 3. ProbeOrientation A. IonSaturationCurrent Poloidal cross-sectional view Top view LFS

  15. 2. ProbeOrientation B. Floatingpotential Opposite behaviour of LFS and HFS 1st day Consistent with expectation 2nd day

  16. 3. Conclusions • Radial profiles of Ufl and Isat were measured: • For deeper positions the plasma is disturbed by the probe • Safe depth of the probe was estimated • Radial electrical field and poloidal velocity were determined • Polar dependence of radial profiles of Ufl and Isat were measured: • Four angles of Langmuir probe were measured • For some regimes, results are consistent with expectations • We found very inconsistent regime => we need to be careful about LFS and HFS • Gomtraic doesn’t end up today

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