TJ-II:Interferometry: Difference between revisions
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The diagnostic is located in [[TJ-II:Sectors|sector]] B8. | The diagnostic is located in [[TJ-II:Sectors|sector]] B8. | ||
The probing beam has an inclination of 18.7º with respect to the vertical and a frequency of 140 GHz, corresponding to a wavelength of λ = 2.14 mm. | The probing beam has an inclination of 18.7º with respect to the vertical and a frequency of 140 GHz, corresponding to a wavelength of λ = 2.14 mm. | ||
The diagnostic provides a time trace of the- | The diagnostic provides a time trace of the line-integrated electron density (65536 points, sampling rate 100 kHz). | ||
The time trace is called 'Densidad2_' in the [[TJ-II:Shot_database|TJ-II database]]. | The time trace is called 'Densidad2_' in the [[TJ-II:Shot_database|TJ-II database]]. | ||
The signal is less reliable for high densities (above 2-3 10<sup>19</sup> m<sup>-3</sup>). | The signal is less reliable for high densities (above 2-3 10<sup>19</sup> m<sup>-3</sup>). | ||
Revision as of 20:39, 5 August 2009
TJ-II has two interferometry systems for the measurement of the line-integrated density.
The Microwave interferometer
The diagnostic is located in sector B8. The probing beam has an inclination of 18.7º with respect to the vertical and a frequency of 140 GHz, corresponding to a wavelength of λ = 2.14 mm. The diagnostic provides a time trace of the line-integrated electron density (65536 points, sampling rate 100 kHz). The time trace is called 'Densidad2_' in the TJ-II database. The signal is less reliable for high densities (above 2-3 1019 m-3). This time trace is fundamental for machine operation.
The CO2 interferometer
The probing wavelength of the CO2 interferometer is λ = 10.6 μm. [1] [2] The system is located in sector B1.