TJ-II:Biasing probe: Difference between revisions
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[[File:TJ-II_Biasing_probe.jpg|300px|thumb|right|Layout of the biasing probe, mounted on the reciprocating probe drive]] | [[File:TJ-II_Biasing_probe.jpg|300px|thumb|right|Layout of the biasing probe, mounted on the [[TJ-II:Langmuir Probes|reciprocating probe]] drive]] | ||
At [[TJ-II]], a 2-D carbon composite mushroom shaped electrode (12 mm high with a diameter of 25 mm) has been developed and installed on a fast reciprocating probe drive. Typically, the electrode is inserted to a position 2 cm inside the last closed flux surface (LCFS) and biased positively (200-300 V) with respect to one of the two [[TJ-II:Limiter|TJ-II limiters]] located in the scrape-off layer region (about 0.5 cm beyond the LCFS). Measured electrode currents are in the range of 30-50 A. | At [[TJ-II]], a 2-D carbon composite mushroom shaped electrode (12 mm high with a diameter of 25 mm) has been developed and installed on a fast reciprocating probe drive. Typically, the electrode is inserted to a position 2 cm inside the last closed flux surface (LCFS) and biased positively (200-300 V) with respect to one of the two [[TJ-II:Limiter|TJ-II limiters]] located in the scrape-off layer region (about 0.5 cm beyond the LCFS). Measured electrode currents are in the range of 30-50 A. | ||
<ref>[http://dx.doi.org/10.1007/s10582-006-0044-3 C. Silva et al, ''Transport and fluctuations during electrode biasing on TJ-II'', Czech. J. Phys. '''55''' (2005) 1589]</ref> | <ref>[http://dx.doi.org/10.1007/s10582-006-0044-3 C. Silva et al, ''Transport and fluctuations during electrode biasing on TJ-II'', Czech. J. Phys. '''55''' (2005) 1589]</ref> | ||
Revision as of 16:44, 2 October 2009
Layout of the biasing probe, mounted on the reciprocating probe drive
At TJ-II, a 2-D carbon composite mushroom shaped electrode (12 mm high with a diameter of 25 mm) has been developed and installed on a fast reciprocating probe drive. Typically, the electrode is inserted to a position 2 cm inside the last closed flux surface (LCFS) and biased positively (200-300 V) with respect to one of the two TJ-II limiters located in the scrape-off layer region (about 0.5 cm beyond the LCFS). Measured electrode currents are in the range of 30-50 A. [1] [2]