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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> | <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> | <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> | <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 φ = 38° ([[TJ-II:Sectors|sector]] D4) and probe drive 2 at φ = 195° ([[TJ-II:Sectors|sector]] B2). | Probe drive 1 is located at φ = 38.2°, R=134 cm ([[TJ-II:Sectors|sector]] D4) and probe drive 2 at φ = 195° ([[TJ-II:Sectors|sector]] B2). | ||
== Probe heads == | == Probe heads == | ||
Several different heads can be mounted on the reciprocating drives: e.g., | 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. | ||
[[File:Langmuir_probe_head.gif|200px|thumb|left|Photo of a | {| border="0" style="width:450px;" | ||
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[[File:TJ-II_Rake.png| | | [[File:Langmuir_probe_head.gif|200px|thumb|left|Photo of a staircase Langmuir probe head with three sets of measurement pins]] | ||
| [[File:Multipin.jpg|200px|thumb|left|Photo of a multipin Langmuir probe head]] | |||
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| [[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]] | |||
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== See also == | == See also == | ||