TJ-II:Electron Cyclotron Emission: Difference between revisions
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== Calibration == | == Calibration == | ||
The system is calibrated absolutely by comparing room temperature with liquid nitrogen temperature. | The system is calibrated absolutely by comparing room temperature with liquid nitrogen temperature. | ||
<ref name="Luna"> | <ref name="Luna">E. de la Luna, J. Sánchez, V. Tribaldos, and T. Estrada, ''Multichannel electron cyclotron emission radiometry in TJ-II stellarator'', [[doi:10.1063/1.1315636|Rev. Sci. Instrum. '''72''', 379 (2001)]]</ref> | ||
<ref> | <ref>E. de la Luna et al, ''Electron cyclotron emission measurements on TJ-II stellarator plasmas'', [[doi:10.1016/S0920-3796(00)00492-0|Fusion Engineering and Design '''53''', Issues 1-4 (2001) 147-151]]</ref> | ||
The optical system and the transmission line of the ECE diagnostic were designed to allow the calibration to be performed outside the vacuum vessel keeping the arrangement of the diagnostic. | The optical system and the transmission line of the ECE diagnostic were designed to allow the calibration to be performed outside the vacuum vessel keeping the arrangement of the diagnostic. | ||
To calibrate, the transmission line is opened close to the diagnostic port (C5-bottom). Then the port flange, which holds the optical system and the wave-guide up to that point, is extracted from the torus and assembled with the same alignment outside the vacuum vessel. | To calibrate, the transmission line is opened close to the diagnostic port (C5-bottom). Then the port flange, which holds the optical system and the wave-guide up to that point, is extracted from the torus and assembled with the same alignment outside the vacuum vessel. | ||
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The emission can be simulated by the [[TRECE]] ray tracing code. | The emission can be simulated by the [[TRECE]] ray tracing code. | ||
<ref name="Tribal"> | <ref name="Tribal">V. Tribaldos and B. P. van Milligen, ''Electron cyclotron emission calculations for TJ-II stellarator'', [[doi:10.1088/0029-5515/36/3/I02|Nucl. Fusion '''36''', 283 (1996)]]</ref> | ||
The local radiation temperature is assumed to be a function only of the local electron temperature at the resonant layer; however, if the plasma is not Maxwellian or if the plasma is optically thin, the measured radiation temperature is no longer equal to the electron temperature. | The local radiation temperature is assumed to be a function only of the local electron temperature at the resonant layer; however, if the plasma is not Maxwellian or if the plasma is optically thin, the measured radiation temperature is no longer equal to the electron temperature. | ||