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Title: Initial results and designs of dual-filter and plenoptic imaging for high-temperature plasmas

Abstract

Mass injection has found new applications in magnetic fusion including edge-localized-mode control. Better understanding of injected-mass-plasma interactions requires spatially and temporally resolved diagnostics that can characterize the dynamics of the mass interactions with plasmas. Fast imaging can be used to characterize the ionization dynamics such as the propagation of the ionization front, which moves at the thermal sound or higher speed, and mixing of the neutral atoms with the ambient plasma. Multi-wavelength spectral imaging is promising since different parts of the plasma give different spectral signatures. Here in this paper we describe a dual-spectral imaging technique based on a monochromatic camera sensor and filters with two passing optical wavelengths. The method is shown to improve image contrast, and it compares favorably with alternatives such as color cameras and methods using a filter wheel. Further improvements through relative filter area ratios and plenoptic imaging are possible. Finally, the initial results from EAST and plenoptic imaging are also included.

Authors:
 [1]; ORCiD logo [2];  [1]; ORCiD logo [2];  [1];  [3]; ORCiD logo [4];  [2]
+ Show Author Affiliations
  1. Chinese Academy of Sciences (CAS), Hefei (China). Inst. Plasma Phys.
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  4. Univ. of Maryland, Baltimore, MD (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC). Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1483517
Report Number(s):
LA-UR-18-22982
Journal ID: ISSN 0034-6748
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 10; Conference: 22. Topical conference on high temperature plasma diagnostics (HTPD 2018) , San Diego, CA (United States), 16 April (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; Magnetic Fusion Energy

Citation Formats

Sun, Zhen, Baldwin, Jon K., Xu, Wei, Wang, Zhehui, Hu, Jiansheng, Maingi, Rajesh, Romero-Talamas, Carlos, and Oschwald, David M. Initial results and designs of dual-filter and plenoptic imaging for high-temperature plasmas. United States: N. p., 2018. Web. doi:10.1063/1.5036633.
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Sun, Zhen, Baldwin, Jon K., Xu, Wei, Wang, Zhehui, Hu, Jiansheng, Maingi, Rajesh, Romero-Talamas, Carlos, & Oschwald, David M. Initial results and designs of dual-filter and plenoptic imaging for high-temperature plasmas. United States. https://doi.org/10.1063/1.5036633
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Sun, Zhen, Baldwin, Jon K., Xu, Wei, Wang, Zhehui, Hu, Jiansheng, Maingi, Rajesh, Romero-Talamas, Carlos, and Oschwald, David M. Thu . "Initial results and designs of dual-filter and plenoptic imaging for high-temperature plasmas". United States. https://doi.org/10.1063/1.5036633. https://www.osti.gov/servlets/purl/1483517.
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@article{osti_1483517,
title = {Initial results and designs of dual-filter and plenoptic imaging for high-temperature plasmas},
author = {Sun, Zhen and Baldwin, Jon K. and Xu, Wei and Wang, Zhehui and Hu, Jiansheng and Maingi, Rajesh and Romero-Talamas, Carlos and Oschwald, David M.},
abstractNote = {Mass injection has found new applications in magnetic fusion including edge-localized-mode control. Better understanding of injected-mass-plasma interactions requires spatially and temporally resolved diagnostics that can characterize the dynamics of the mass interactions with plasmas. Fast imaging can be used to characterize the ionization dynamics such as the propagation of the ionization front, which moves at the thermal sound or higher speed, and mixing of the neutral atoms with the ambient plasma. Multi-wavelength spectral imaging is promising since different parts of the plasma give different spectral signatures. Here in this paper we describe a dual-spectral imaging technique based on a monochromatic camera sensor and filters with two passing optical wavelengths. The method is shown to improve image contrast, and it compares favorably with alternatives such as color cameras and methods using a filter wheel. Further improvements through relative filter area ratios and plenoptic imaging are possible. Finally, the initial results from EAST and plenoptic imaging are also included.},
doi = {10.1063/1.5036633},
journal = {Review of Scientific Instruments},
number = 10,
volume = 89,
place = {United States},
year = {Thu Oct 04 00:00:00 EDT 2018},
month = {Thu Oct 04 00:00:00 EDT 2018}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1063/1.5036633
Copyright Statement
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Cited by: 3 works
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Figures / Tables:

FIG. 1 FIG. 1: An example of EAST lithium pellet ablation movie sequence starting from A to F. Only in (A-C) we may separate the 'neutral cloud' from the low-temperature 'plasma cloud'. More details are given in the text.
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Works referenced in this record:

The ITER design
journal, April 2002

Correlated-intensity velocimeter for arbitrary reflector for laser-produced plasma experiments
journal, October 2006

  • Wang, Zhehui; Luo, Sheng-Nian; Barnes, Cris W.
  • Review of Scientific Instruments, Vol. 77, Issue 10
  • DOI: 10.1063/1.2336787

The Rose model, revisited
journal, January 1999

First Results of ELM Triggering With a Multichamber Lithium Granule Injector Into EAST Discharges
journal, May 2018

Single lens stereo with a plenoptic camera
journal, January 1992

  • Adelson, E. H.; Wang, J. Y. A.
  • IEEE Transactions on Pattern Analysis and Machine Intelligence, Vol. 14, Issue 2
  • DOI: 10.1109/34.121783

Hypervelocity dust beam injection for internal magnetic field mapping
journal, March 2003

  • Wang, Zhehui; Wurden, G. A.
  • Review of Scientific Instruments, Vol. 74, Issue 3
  • DOI: 10.1063/1.1534894
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    Works referencing / citing this record:

    Hollow pellet injection for magnetic fusion
    journal, June 2019

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      Figures / Tables found in this record:

      FIG. 1 (p. 3)figure
      FIG. 2 (p. 4)figure
      FIG. 3 (p. 4)figure
      FIG. 4 (p. 4)figure
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      FIG. 7 (p. 5)figure
      Table 1 (p. 5)table
      FIG. 8 (p. 6)figure
      FIG. 9 (p. 6)figure
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