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

H Arakawa; Y Kawano; K Itami

doi:10.1063/1.4745223

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

Rev Sci Instrum. 2012 Oct;83(10):10E345. doi: 10.1063/1.4745223.

Authors

H Arakawa¹, Y Kawano, K Itami

Affiliation

¹ Japan Atomic Energy Agency, Mukoyama, Naka, Japan. arakawa.hiroyuki@jaea.go.jp

PMID: 23127002
DOI: 10.1063/1.4745223

Abstract

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.