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Title: Tokamak-independent Software Analysis Suite for Multi-Spectral Line-Polarization MSE diagnostics

Abstract

A tokamak-independent analysis suite has been developed to process data from Motional Stark Effect (MSE) diagnostics. The software supports multi-spectral line-polarization MSE diagnostics which simultaneously measure emission at the MSE sigma and pi lines as well as at two `background' wavelengths that are displaced from the MSE spectrum by a few nanometers. This analysis accurately estimates the amplitude of partially-polarized background light at the sigma and pi wavelengths even in situations where the background light changes rapidly in time and space. The signal amplitude at many frequencies is computed using a numerical-beat algorithm which allows the retardance of the MSE photo-elastic modulators (PEMs) to be monitored during routine operation. It also allows the use of summed intensities at multiple frequencies in the calculation of polarization direction, which increases the effective signal strength and reduces sensitivity to PEM retardance drift. The software allows the polarization angles to be corrected for calibration drift using a system that illuminates the MSE diagnostic with polarized light at four known polarization angles within ten seconds of a plasma discharge The software suite is modular, parallelized, and portable to other facilities. (2016-06-06)

Authors:
;
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
Publication Date:
DOE Contract Number:  
FC02-99ER54512; AC02-09CH11466
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center; Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1878494
DOI:
https://doi.org/10.7910/DVN/WGIWLW

Citation Formats

Scott, Steven D., and Mumgaard, Robert T. Tokamak-independent Software Analysis Suite for Multi-Spectral Line-Polarization MSE diagnostics. United States: N. p., 2016. Web. doi:10.7910/DVN/WGIWLW.
Scott, Steven D., & Mumgaard, Robert T. Tokamak-independent Software Analysis Suite for Multi-Spectral Line-Polarization MSE diagnostics. United States. doi:https://doi.org/10.7910/DVN/WGIWLW
Scott, Steven D., and Mumgaard, Robert T. 2016. "Tokamak-independent Software Analysis Suite for Multi-Spectral Line-Polarization MSE diagnostics". United States. doi:https://doi.org/10.7910/DVN/WGIWLW. https://www.osti.gov/servlets/purl/1878494. Pub date:Mon Jun 06 00:00:00 EDT 2016
@article{osti_1878494,
title = {Tokamak-independent Software Analysis Suite for Multi-Spectral Line-Polarization MSE diagnostics},
author = {Scott, Steven D. and Mumgaard, Robert T.},
abstractNote = {A tokamak-independent analysis suite has been developed to process data from Motional Stark Effect (MSE) diagnostics. The software supports multi-spectral line-polarization MSE diagnostics which simultaneously measure emission at the MSE sigma and pi lines as well as at two `background' wavelengths that are displaced from the MSE spectrum by a few nanometers. This analysis accurately estimates the amplitude of partially-polarized background light at the sigma and pi wavelengths even in situations where the background light changes rapidly in time and space. The signal amplitude at many frequencies is computed using a numerical-beat algorithm which allows the retardance of the MSE photo-elastic modulators (PEMs) to be monitored during routine operation. It also allows the use of summed intensities at multiple frequencies in the calculation of polarization direction, which increases the effective signal strength and reduces sensitivity to PEM retardance drift. The software allows the polarization angles to be corrected for calibration drift using a system that illuminates the MSE diagnostic with polarized light at four known polarization angles within ten seconds of a plasma discharge The software suite is modular, parallelized, and portable to other facilities. (2016-06-06)},
doi = {10.7910/DVN/WGIWLW},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2016},
month = {6}
}

Works referencing / citing this record:

Tokamak-independent software analysis suite for multi-spectral line-polarization MSE diagnostics
journal, July 2016