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Title: Motional Stark effect imaging first results on the DIII-D tokamak

Abstract

A motional Stark effect (MSE) imaging diagnostic was benchmarked against existing conventional MSE polarimeters on the DIII-D tokamak and delivered new capabilities for measuring the magnetic pitch angle from 2 neutral beams and on the high field side of DIII-D. Line integration across flux surfaces was considerable for the radial view utilised; yet, the imaging MSE measurements from both beams were self-consistent and in close agreement with conventional MSE measurements. The ferroelectric liquid crystal waveplate used in the imaging polarimeter was discovered to have spatially non-uniform retardance; thus, it is required for the calibration source to replicate the ray paths of the neutral beam emission through the optical system.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [2];  [2];  [2]
  1. Australian National Univ., Canberra, ACT (Australia)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1545506
Alternate Identifier(s):
OSTI ID: 1476683
Grant/Contract Number:  
AC52-07NA27344; FC02-04ER54698
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 10; Conference: 22. Proceedings of the Topical Conference on High-Temperature Plasma Diagnostics, San Diego, CA (United States), Apr 2018; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

Thorman, Alex, Michael, Clive, Howard, John, Victor, Brian, Holcomb, Chris, and Allen, Steve. Motional Stark effect imaging first results on the DIII-D tokamak. United States: N. p., 2018. Web. doi:10.1063/1.5038969.
Thorman, Alex, Michael, Clive, Howard, John, Victor, Brian, Holcomb, Chris, & Allen, Steve. Motional Stark effect imaging first results on the DIII-D tokamak. United States. doi:10.1063/1.5038969.
Thorman, Alex, Michael, Clive, Howard, John, Victor, Brian, Holcomb, Chris, and Allen, Steve. Mon . "Motional Stark effect imaging first results on the DIII-D tokamak". United States. doi:10.1063/1.5038969. https://www.osti.gov/servlets/purl/1545506.
@article{osti_1545506,
title = {Motional Stark effect imaging first results on the DIII-D tokamak},
author = {Thorman, Alex and Michael, Clive and Howard, John and Victor, Brian and Holcomb, Chris and Allen, Steve},
abstractNote = {A motional Stark effect (MSE) imaging diagnostic was benchmarked against existing conventional MSE polarimeters on the DIII-D tokamak and delivered new capabilities for measuring the magnetic pitch angle from 2 neutral beams and on the high field side of DIII-D. Line integration across flux surfaces was considerable for the radial view utilised; yet, the imaging MSE measurements from both beams were self-consistent and in close agreement with conventional MSE measurements. The ferroelectric liquid crystal waveplate used in the imaging polarimeter was discovered to have spatially non-uniform retardance; thus, it is required for the calibration source to replicate the ray paths of the neutral beam emission through the optical system.},
doi = {10.1063/1.5038969},
journal = {Review of Scientific Instruments},
number = 10,
volume = 89,
place = {United States},
year = {2018},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

FIG. 1 FIG. 1: Diagram of the IMSE optical assembly, viewing geometry, and relevant neutral beams. The conventional MSE systems view individual radial positions on the 30L beam, while the imaging MSE system is operable with either the 30L or 30R beam. Curved dotted lines indicate the standard position of the innermore » and outer separatrices at the midplane and the magnetic axis. The image plane of the previous conventional MSE system is an intermediate image in the IMSE installation, and the 400 mm lens and further downstream optics are on an optical rail detached from the tokamak. The position and components only present when calibrating the polarimeter are indicated.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.