Pulse-burst laser-based 10 kHz Thomson scattering measurements

Zichen HE; Cary SMITH; Zhili ZHANG; Theodore M BIEWER; Naibo JIANG; Paul S HSU; Sukesh ROY

doi:10.1088/2058-6272/ab2e30

Plasma Science and Technology > 2019 > 21(10): 105603. > DOI: 10.1088/2058-6272/ab2e30

Zichen HE, Cary SMITH, Zhili ZHANG, Theodore M BIEWER, Naibo JIANG, Paul S HSU, Sukesh ROY. Pulse-burst laser-based 10 kHz Thomson scattering measurements[J]. Plasma Science and Technology, 2019, 21(10): 105603. DOI: 10.1088/2058-6272/ab2e30

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Pulse-burst laser-based 10 kHz Thomson scattering measurements

¹ Mechanical, Aerospace and Biomedical Engineering, University of Tennessee, Knoxville TN 37996, United States of America
² Fusion Energy Division, Oak Ridge National Laboratory, Oak Ridge TN 37931, United States of America
³ Spectral Energies LLC, Dayton OH 45431, United States of America

Funds: This work was supported by the US Department of Energy’s STTR program under Grant No. DE-SC0018672 (Program Manager: Dr Matthew Lanctot).

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Received Date: April 07, 2019
Revised Date: June 29, 2019
Accepted Date: June 30, 2019

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Abstract

Abstract

Thomson scattering (TS), as a popular and reliable diagnostic technique, has successfully measured electron temperatures and electron number densities of plasmas for many years. However, conventional TS techniques using Nd:YAG lasers operate only at tens of hertz. Here, we present the development of a high-repetition-rate TS instrument based on a high-speed, pulse-burst laser system to greatly increase the temporal resolution of measurements. Successful instrument prototype testing was carried out by collecting TS light from laboratory helium and argon plasmas at 10 kHz. Calibration of the instrument detection sensitivity using nitrogen/ oxygen rotational Raman scattering signal is also presented. Quantitative electron number densities and electron temperatures of the plasma were acquired at 10 kHz, for stable plasma discharges as, respectively, ∼0.9 eV and ∼5.37×10²¹ m⁻³ for the argon plasma, and ∼1 eV and ∼6.5×10²¹ m⁻³ for the helium plasma.
- Thomson scattering,
- high-speed,
- pulse-burst laser

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References (24)

References

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Pulse-burst laser-based 10 kHz Thomson scattering measurements