Correction of the spectral calibration of the Joint European Torus core light detecting and ranging Thomson scattering diagnostic using ray tracing

TitleCorrection of the spectral calibration of the Joint European Torus core light detecting and ranging Thomson scattering diagnostic using ray tracing
Publication TypeJournal Article
Year of Publication2013
AuthorsJ. Hawke, R. Scannell, M. Maslov, J.B Migozzi
JournalReview of Scientific Instruments
Volume84
Number10
Pagination103507
Date PublishedOct
ISBN Number0034-6748
Abstract

This work isolated the cause of the observed discrepancy between the electron temperature (T-e) measurements before and after the JET Core LIDAR Thomson Scattering (TS) diagnostic was upgraded. In the upgrade process, stray light filters positioned just before the detectors were removed from the system. Modelling showed that the shift imposed on the stray light filters transmission functions due to the variations in the incidence angles of the collected photons impacted plasma measurements. To correct for this identified source of error, correction factors were developed using ray tracing models for the calibration and operational states of the diagnostic. The application of these correction factors resulted in an increase in the observed T-e, resulting in the partial if not complete removal of the observed discrepancy in the measured T-e between the JET core LIDAR TS diagnostic, High Resolution Thomson Scattering, and the Electron Cyclotron Emission diagnostics.

URLhttp://scitation.aip.org/content/aip/journal/rsi/84/10/10.1063/1.4824074
DOI10.1063/1.4824074
Division

FP

Department

PDG

PID

555e171cd6807457cf8359bf2d1c3b43

Alternate TitleRev. Sci. Instrum.

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