Generation of Terahertz Radiation from Laser Irradiation of Wires to Enable Internal Magnetic Field Measurement in Burning Plasmas via Pulsed Polarimetry
POSTER
Abstract
Advanced Bayesian Analysis and interpretive physics modeling of the C-2W beam-driven Field-Reversed Configuration (FRC) experiment provide ample indirect evidence of magnetic field reversal [1]. However, a direct measurement of the magnetic field reversal in an FRC is an extremely challenging task.
The pulsed polarimetry technique [2] enables the inference of both the electron density, ne(s), and magnetic field B||(s) via the measurement of the backscattered intensity and the progressive Faraday rotation. With large Faraday rotation, the internal magnetic field can be resolved to 10 cm spatial resolutions. This requires intense 10’s mJ THz pulses with wavelengths in the 100–200 micron range and sub-ns pulse durations. However, such powerful THz sources do not currently exist.
In this paper we investigate generation of powerful THz radiation by intense laser irradiation of wires [3]. The simulation results are compared with experiments at the multi-terawatt (MTW) laser at University of Rochester [4]. Study of optimized wire and laser parameters is also presented.
1. Gota, H.; et al. Nuclear Fusion 2021, 61, 106039.
2. Smith, R.J. Review of Scientific Instruments 2008, 79, 10E703.
3. Zhuo, H.B.; et al. Physical Review E 2017, 95, 13201.
4. Bruhaug, G. Bulletin of the American Physical Society 2021, 66.
The pulsed polarimetry technique [2] enables the inference of both the electron density, ne(s), and magnetic field B||(s) via the measurement of the backscattered intensity and the progressive Faraday rotation. With large Faraday rotation, the internal magnetic field can be resolved to 10 cm spatial resolutions. This requires intense 10’s mJ THz pulses with wavelengths in the 100–200 micron range and sub-ns pulse durations. However, such powerful THz sources do not currently exist.
In this paper we investigate generation of powerful THz radiation by intense laser irradiation of wires [3]. The simulation results are compared with experiments at the multi-terawatt (MTW) laser at University of Rochester [4]. Study of optimized wire and laser parameters is also presented.
1. Gota, H.; et al. Nuclear Fusion 2021, 61, 106039.
2. Smith, R.J. Review of Scientific Instruments 2008, 79, 10E703.
3. Zhuo, H.B.; et al. Physical Review E 2017, 95, 13201.
4. Bruhaug, G. Bulletin of the American Physical Society 2021, 66.
Presenters
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ALES NECAS
TAE Technologies
Authors
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ALES NECAS
TAE Technologies
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Roger J Smith
TAE Technologies, TAE Technologies, Inc., Tri Alpha Energy, Inc
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Kan Zhai
TAE Technologies, TAE Technologies, Inc.
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Gerrit Bruhaug
University of Rochester