TJ-II:Biasing probe: Difference between revisions
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Signal names in the [[TJ-II:Shot_database|TJ-II database]]: | Signal names in the [[TJ-II:Shot_database|TJ-II database]]: | ||
'PolI', 'PolV'. | 'PolI', 'PolV'. | ||
[[File:Polarisation_probe.jpg|500px|thumb|left|Photo of the reciprocating drive of the biasing probe (top right)]] | |||
== References == | == References == | ||
<references /> | <references /> | ||
Revision as of 14:47, 21 September 2010
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.
Signal names in the TJ-II database: 'PolI', 'PolV'.
