TJ-II:Langmuir Probes: Difference between revisions

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[[File:TJ-II_Langmuir.png|400px|thumb|right|Location of the reciprocating Langmuir probes at TJ-II]]
[[File:TJ-II_Langmuir.png|400px|thumb|right|Location of the reciprocating Langmuir probes at TJ-II]]
[[TJ-II]] has two fast reciprocating drives for [[:Wikipedia:Langmuir probe|Langmuir probes]] (with a displacement velocity of approximately 1 m/s).
[[TJ-II]] has two fast reciprocating drives for [[:Wikipedia:Langmuir probe|Langmuir probes]] (with a displacement velocity of approximately 1 m/s).
<ref>[http://link.aip.org/link/?RSINAK/70/415/1 M.A. Pedrosa et al, ''Fast movable remotely controlled Langmuir probe system'', Rev. Sci. Instrum. '''70''' (1999) 415]</ref>
<ref>M.A. Pedrosa et al, ''Fast movable remotely controlled Langmuir probe system'', [[doi:10.1063/1.1149350|Rev. Sci. Instrum. '''70''' (1999) 415]]</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>E. Calderón et al, ''On the Influence of Probe Presheath on the Measurement of Fluctuation and E × B Turbulent Transport by Langmuir Probes'', [[doi:10.1002/ctpp.200410104|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>M.A. Pedrosa et al, ''Evidence of Long-Distance Correlation of Fluctuations during Edge Transitions to Improved-Confinement Regimes in the TJ-II Stellarator'', [[doi:10.1103/PhysRevLett.100.215003|Phys. Rev. Lett. '''100''' (2008) 215003]]</ref>
Probe drive 1 is located at &phi; = 38.2&deg;, R=134 cm ([[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; = 38.2&deg;, R=134 cm ([[TJ-II:Sectors|sector]] D4) and probe drive 2 at &phi; = 195&deg; ([[TJ-II:Sectors|sector]] B2).


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


Several different heads can be mounted on the reciprocating drives: e.g., staircase Langmuir probes, a rake probe (as of 2009), or a multi-pin Langmuir probe (2010). A [[TJ-II:Biasing probe|biasing probe]] has also been used.
Several different heads can be mounted on the reciprocating drives: e.g., staircase Langmuir probes, a rake probe (as of 2009), or a multi-pin Langmuir probe (2010).


{| border="0" style="width:450px;"
{| border="0" style="width:450px;"
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| [[File:Multipin.jpg|200px|thumb|left|Photo of a multipin Langmuir probe head]]
| [[File:Multipin.jpg|200px|thumb|left|Photo of a multipin Langmuir probe head]]
|-  
|-  
| colspan="2" | [[File:TJ-II_Rake.png|450px|thumb|left|Photo of a Langmuir rake probe head]]
| [[File:TJ-II_Rake.png|400px|thumb|left|Photo of a 12-pin Langmuir rake probe head]]
| [[File:Probe_8.png|400px|thumb|left|Photo of an 8-pin Langmuir rake probe head]]
|-
|-
| [[File:Vorticity probe.png|400px|thumb|left|Photo of a vorticity probe probe head<ref>D. Carralero Ortiz, ''Electromagnetic Instability Studies in Fusion Plasmas Edge'', [https://oa.upm.es/11485/ PhD thesis, UPM (2012)]</ref>]]
|
|}
|}


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* [[TJ-II:Limiter|Limiter probes]]
* [[TJ-II:Limiter|Limiter probes]]
* [[TJ-II:Biasing probe|Biasing probe]]
* [[TJ-II:Retarding Field Analyzer|Retarding Field Analyzer]]


== References ==
== References ==
<references />
<references />

Latest revision as of 18:30, 29 September 2025

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 = 38.2°, R=134 cm (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., staircase Langmuir probes, a rake probe (as of 2009), or a multi-pin Langmuir probe (2010).

Photo of a staircase Langmuir probe head with three sets of measurement pins
Photo of a multipin Langmuir probe head
Photo of a 12-pin Langmuir rake probe head
Photo of an 8-pin Langmuir rake probe head
Photo of a vorticity probe probe head[4]

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
  4. ↑ D. Carralero Ortiz, Electromagnetic Instability Studies in Fusion Plasmas Edge, PhD thesis, UPM (2012)
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