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Title: A new method of out-of-focus millimeter wave imaging in fusion plasma diagnostics using Bessel beams

Abstract

Electron cyclotron emission imaging (ECEI) and microwave imaging reflectometry diagnostics have been employed on a number of magnetic fusion plasma confinement devices. The common approach is based on a Gaussian beam assumption, which generates good spatial resolution (centimeter level). However, the radial focal depth is limited by the poloidal resolution, which is comparable with the Rayleigh length (~150 mm). By contrast, a new Bessel beam approach has been developed and demonstrated to generate much longer focal depth with the property of propagation stability. To test the new approach, the DIII-D tokamak LCP ECEI optics have been re-designed to support a Bessel beam approach based on an axicon lens. The achievable radial coverage can exceed that of the current Gaussian approach by 3×. Finally, the imaging result is discussed in this paper based on the simulation analysis and laboratory testing result.

Authors:
ORCiD logo [1];  [2];  [2];  [2];  [2]; ORCiD logo [2];  [2]
  1. Zhejiang Univ., Hangzhou (China). College of Optical Science and Engineering, State Key Lab. of Modern Optical Instrumentation
  2. Univ. of California, Davis, CA (United States)
Publication Date:
Research Org.:
Univ. of California, Davis, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1540147
Alternate Identifier(s):
OSTI ID: 1473740
Grant/Contract Number:  
SC0012551
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 9; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
Instruments & Instrumentation; Physics

Citation Formats

Li, J. X., Zhu, Y. L., Chen, M., Cao, J. H., Dannenberg, J., Domier, C., and Luhmann, N. C. A new method of out-of-focus millimeter wave imaging in fusion plasma diagnostics using Bessel beams. United States: N. p., 2018. Web. doi:10.1063/1.5012778.
Li, J. X., Zhu, Y. L., Chen, M., Cao, J. H., Dannenberg, J., Domier, C., & Luhmann, N. C. A new method of out-of-focus millimeter wave imaging in fusion plasma diagnostics using Bessel beams. United States. doi:10.1063/1.5012778.
Li, J. X., Zhu, Y. L., Chen, M., Cao, J. H., Dannenberg, J., Domier, C., and Luhmann, N. C. Tue . "A new method of out-of-focus millimeter wave imaging in fusion plasma diagnostics using Bessel beams". United States. doi:10.1063/1.5012778. https://www.osti.gov/servlets/purl/1540147.
@article{osti_1540147,
title = {A new method of out-of-focus millimeter wave imaging in fusion plasma diagnostics using Bessel beams},
author = {Li, J. X. and Zhu, Y. L. and Chen, M. and Cao, J. H. and Dannenberg, J. and Domier, C. and Luhmann, N. C.},
abstractNote = {Electron cyclotron emission imaging (ECEI) and microwave imaging reflectometry diagnostics have been employed on a number of magnetic fusion plasma confinement devices. The common approach is based on a Gaussian beam assumption, which generates good spatial resolution (centimeter level). However, the radial focal depth is limited by the poloidal resolution, which is comparable with the Rayleigh length (~150 mm). By contrast, a new Bessel beam approach has been developed and demonstrated to generate much longer focal depth with the property of propagation stability. To test the new approach, the DIII-D tokamak LCP ECEI optics have been re-designed to support a Bessel beam approach based on an axicon lens. The achievable radial coverage can exceed that of the current Gaussian approach by 3×. Finally, the imaging result is discussed in this paper based on the simulation analysis and laboratory testing result.},
doi = {10.1063/1.5012778},
journal = {Review of Scientific Instruments},
number = 9,
volume = 89,
place = {United States},
year = {2018},
month = {9}
}

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