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TJ-II:Langmuir Probes

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TJ-II has two similar multi-Langmuir probes installed on fast reciprocating drives (with a velocity of approximately 1 m/s). [1] [2] [3] Probe 1 is located at φ = 45° (sector D4) and probe 2 at φ = 285° (sector B2).

Location of the reciprocating Langmuir probes at TJ-II
Photo of a Langmuir probe head with three sets of measurement pins

References

  1. ↑ M.A. Pedrosa et al, Fast movable remotely controlled Langmuir probe system, Rev. Sci. Instrum. 70 (1999) 415
  2. ↑ E. Calderón et al, On the Influence of Probe Presheath on the Measurement of Fluctuation and E × B Turbulent Transport by Langmuir Probes, Contributions to Plasma Physics 44, Issue 7-8 (2004) 700 - 704
  3. ↑ M.A. Pedrosa et al, Evidence of Long-Distance Correlation of Fluctuations during Edge Transitions to Improved-Confinement Regimes in the TJ-II Stellarator, Phys. Rev. Lett. 100 (2008) 215003
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