TJ-II:Langmuir Probes: Difference between revisions

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<ref>[http://dx.doi.org/10.1002/ctpp.200410104 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]</ref>
<ref>[http://dx.doi.org/10.1002/ctpp.200410104 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]</ref>
<ref>[http://link.aps.org/doi/10.1103/PhysRevLett.100.215003 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]</ref>
<ref>[http://link.aps.org/doi/10.1103/PhysRevLett.100.215003 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]</ref>
Probe drive 1 is located at &phi; = 35&deg; ([[TJ-II:Sectors|sector]] D4) and probe drive 2 at &phi; = 195&deg; ([[TJ-II:Sectors|sector]] B2).
Probe drive 1 is located at &phi; = 38&deg; ([[TJ-II:Sectors|sector]] D4) and probe drive 2 at &phi; = 195&deg; ([[TJ-II:Sectors|sector]] B2).


== Probe heads ==
== Probe heads ==

Revision as of 12:43, 30 November 2010

Location of the reciprocating Langmuir probes at TJ-II

TJ-II has two fast reciprocating drives for Langmuir probes (with a displacement velocity of approximately 1 m/s). [1] [2] [3] Probe drive 1 is located at φ = 38° (sector D4) and probe drive 2 at φ = 195° (sector B2).

Probe heads

Several different heads can be mounted on the reciprocating drives: e.g., multi-pin Langmuir probes, or a rake probe (as of 2009). A biasing probe has also been used.

Photo of a multi-pin Langmuir probe head with three sets of measurement pins
Photo of a Langmuir rake probe head

See also

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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