Identification of errors in the electron density measurements of a tangential interferometer/polarimeter system during a tokamak discharge

Arakawa, H.; Kawano, Y.; Itami, K.
October 2012
Review of Scientific Instruments;Oct2012, Vol. 83 Issue 10, p10E345
Academic Journal
A new method for the comparative verification of electron density measurements obtained with a tangential interferometer and a polarimeter during a discharge is proposed. The possible errors associated with the interferometer and polarimeter are classified by the time required for their identification. Based on the characteristics of the errors, the fringe shift error of the interferometer and the low-frequency noise of the polarimeter were identified and corrected for the JT-60U tangential interferometer/polarimeter system.


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