TJ-II:Interferometry: Difference between revisions

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This time trace is fundamental for machine operation.
This time trace is fundamental for machine operation.


== The CO<sub>2</sub> interferometer ==
== Two-colour interferometer ==


The probing wavelength of the CO<sub>2</sub> interferometer is &lambda; = 10.6 &mu;m.
The double wavelength heterodyne interferometer (CO<sub>2</sub>: 10.6 &mu;m, HeNe: 0.63 &mu;m)
<ref>[http://link.aip.org/link/?RSINAK/72/96/1 H. Lamela et al,  Rev. Sci. Instrum. '''72''', 96 (2001)]</ref>
provides values of the plasma line integral density in scenarios with average densities ranging from a few times 10<sup>18</sup> m<sup>–3</sup> to more than 5&times;10<sup>19</sup> m<sup>–3</sup>. The results have been compared with those from the 2 mm (microwave) interferometer, obtaining an excellent agreement. Working with a final bandwidth of 4 kHz, a one pass line integral error level about 2&times;10<sup>17</sup> m<sup>–2</sup> has been achieved.
<ref>[http://link.aip.org/link/?RSINAK/75/3414/1 M. Sánchez at al, Rev. Sci. Instrum. '''75''', 3414 (2004)]</ref>
<ref>[http://link.aip.org/link/?RSINAK/72/96/1 H. Lamela et al,  ''Laser interferometric experiments for the TJ-II stellarator electron-density measurements'', Rev. Sci. Instrum. '''72''', 96 (2001)]</ref>
<ref>[http://link.aip.org/link/?RSINAK/75/3414/1 M. Sánchez at al, ''High resolution CO<sub>2</sub> interferometry on the TJ-II stellarator by using an ADC-based phase meter'', Rev. Sci. Instrum. '''75''', 3414 (2004)]</ref>
The system is located in [[TJ-II:Sectors|sector]] B1.
The system is located in [[TJ-II:Sectors|sector]] B1.


==References==
==References==
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<references />
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