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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 [[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. | |||
<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://www-pub.iaea.org/MTCD/Meetings/FEC2006/ex_p4-40.pdf M.A. Pedrosa et al, ''Transport and fluctuations during electrode biasing experiments on the TJ-II stellarator'', Proc. 12<sup>st</sup> Fusion Energy Conf. (2006) EX-P4/40]</ref> | |||
In 2009, the power source (originally DC) has been upgraded to allow modulation with a frequency of up to a few kHz. | |||
Location: [[TJ-II:Sectors|sector]] A4. | |||
Signal names in the [[TJ-II:Shot_database|TJ-II database]]: | |||
'PolI', 'PolV'. | |||
[[File:Polarisation_probe.jpg|500px|thumb|left|Photo of the reciprocating drive of the biasing probe (top right)]] | |||
== References == | |||
<references /> | |||