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Title: Estimating the performance of lithium beam measurements of current density and electron density in an H-mode pedestal

Abstract

The lithium beam is an effective diagnostic tool for investigation of stability and particle transport in the pedestal. It was used successfully to measure edge current density on DIII-D, achieving qualitative agreement with neoclassical models. Electron density profiles were also measured. Proposed upgrades will continue these measurements with higher reliability as well as explore edge current measurements using spectroscopy. The optics will be redesigned to optimize throughput and aperture broadening and to replace the photomultiplier tubes with avalanche photodiodes. Here, the new system will yield detailed measurements of the pedestal, complementing existing diagnostics for investigating pedestal stability, edge localized mode cycle, and particle transport through the pedestal.

Authors:
 [1];  [1]; ORCiD logo [1];  [2]; ORCiD logo [1]
+ Show Author Affiliations
  1. Univ. of Texas, Austin, TX (United States)
  2. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States); Univ. of Texas, Austin, TX (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
OSTI Identifier:
1609202
Alternate Identifier(s):
OSTI ID: 1479833
Grant/Contract Number:  
FC02-04ER54698; FG02-97ER54415; FG03-96ER54373
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 10; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; instruments & instrumentation; physics; polarimeters; signal processing; plasma confinement; high resolution spectroscopy; Zeeman spectroscopy; charge exchange reactions; electron density; optical polarimetry; error analysis; quantum efficiency

Citation Formats

Liao, Ken T., Austin, M. E., Rowan, W. L., Thomas, D. M., and Zhao, B. Z. Estimating the performance of lithium beam measurements of current density and electron density in an H-mode pedestal. United States: N. p., 2018. Web. doi:10.1063/1.5035294.
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Liao, Ken T., Austin, M. E., Rowan, W. L., Thomas, D. M., & Zhao, B. Z. Estimating the performance of lithium beam measurements of current density and electron density in an H-mode pedestal. United States. https://doi.org/10.1063/1.5035294
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Liao, Ken T., Austin, M. E., Rowan, W. L., Thomas, D. M., and Zhao, B. Z. Tue . "Estimating the performance of lithium beam measurements of current density and electron density in an H-mode pedestal". United States. https://doi.org/10.1063/1.5035294. https://www.osti.gov/servlets/purl/1609202.
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@article{osti_1609202,
title = {Estimating the performance of lithium beam measurements of current density and electron density in an H-mode pedestal},
author = {Liao, Ken T. and Austin, M. E. and Rowan, W. L. and Thomas, D. M. and Zhao, B. Z.},
abstractNote = {The lithium beam is an effective diagnostic tool for investigation of stability and particle transport in the pedestal. It was used successfully to measure edge current density on DIII-D, achieving qualitative agreement with neoclassical models. Electron density profiles were also measured. Proposed upgrades will continue these measurements with higher reliability as well as explore edge current measurements using spectroscopy. The optics will be redesigned to optimize throughput and aperture broadening and to replace the photomultiplier tubes with avalanche photodiodes. Here, the new system will yield detailed measurements of the pedestal, complementing existing diagnostics for investigating pedestal stability, edge localized mode cycle, and particle transport through the pedestal.},
doi = {10.1063/1.5035294},
journal = {Review of Scientific Instruments},
number = 10,
volume = 89,
place = {United States},
year = {Tue Oct 30 00:00:00 EDT 2018},
month = {Tue Oct 30 00:00:00 EDT 2018}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1063/1.5035294
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