TJ-II:Biasing probe: Difference between revisions
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<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> | ||
<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> | <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. | |||
== References == | == References == | ||
<references /> | <references /> | ||
Revision as of 17:02, 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]
In 2009, the power source (originally DC) has been upgraded to allow modulation with a frequency of up to a few kHz.