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Title: Pulse-burst laser-based 10 kHz Thomson scattering measurements

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. Yet, conventional TS techniques using Nd:YAG lasers operate only at tens of hertz. In this work, we introduce 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 × 10 21 m ₋3 for the argon plasma, and ~1 eV and ~6.5 × 10 21 m ₋3 for the helium plasma.

Authors:
 [1];  [2]; ORCiD logo [1]; ORCiD logo [3];  [4];  [4];  [4]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Spectral Energies LLC, Dayton, OH (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1564185
Grant/Contract Number:  
AC05-00OR22725; SC0018672
Resource Type:
Accepted Manuscript
Journal Name:
Plasma Science and Technology
Additional Journal Information:
Journal Volume: 21; Journal Issue: 10; Journal ID: ISSN 1009-0630
Publisher:
IOPScience
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; high speed; Thomson scattering; electron temperature; electron number density

Citation Formats

HE, Zichen, SMITH, Cary, ZHANG, Zhili, BIEWER, Theodore M., JIANG, Naibo, HSU, Paul S., and ROY, Sukesh. Pulse-burst laser-based 10 kHz Thomson scattering measurements. United States: N. p., 2019. Web. doi:10.1088/2058-6272/ab2e30.
HE, Zichen, SMITH, Cary, ZHANG, Zhili, BIEWER, Theodore M., JIANG, Naibo, HSU, Paul S., & ROY, Sukesh. Pulse-burst laser-based 10 kHz Thomson scattering measurements. United States. doi:10.1088/2058-6272/ab2e30.
HE, Zichen, SMITH, Cary, ZHANG, Zhili, BIEWER, Theodore M., JIANG, Naibo, HSU, Paul S., and ROY, Sukesh. Fri . "Pulse-burst laser-based 10 kHz Thomson scattering measurements". United States. doi:10.1088/2058-6272/ab2e30.
@article{osti_1564185,
title = {Pulse-burst laser-based 10 kHz Thomson scattering measurements},
author = {HE, Zichen and SMITH, Cary and ZHANG, Zhili and BIEWER, Theodore M. and JIANG, Naibo and HSU, Paul S. and ROY, Sukesh},
abstractNote = {Thomson scattering (TS), as a popular and reliable diagnostic technique, has successfully measured electron temperatures and electron number densities of plasmas for many years. Yet, conventional TS techniques using Nd:YAG lasers operate only at tens of hertz. In this work, we introduce 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.},
doi = {10.1088/2058-6272/ab2e30},
journal = {Plasma Science and Technology},
number = 10,
volume = 21,
place = {United States},
year = {2019},
month = {8}
}

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