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:
-
[1];
[2];
- Zhejiang Univ., Hangzhou (China). College of Optical Science and Engineering, State Key Lab. of Modern Optical Instrumentation
- 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:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 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. https://doi.org/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. https://doi.org/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 = {Tue Sep 25 00:00:00 EDT 2018},
month = {Tue Sep 25 00:00:00 EDT 2018}
}
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