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Title: A scalable real-time framework for Thomson scattering analysis: Application to NSTX-U

Abstract

A detailed description of a prototype setup for real-time (RT) Thomson scattering (TS) analysis is presented and implemented in the multi-point Thomson scattering (MPTS) diagnostic system at the National Spherical Torus Experiment Upgrade (NSTX-U). The data acquisition hardware was upgraded with RT capable electronics (RT-analog digital converters and a RT server) that allow for fast digitization of the laser pulse signal of eight radial MPTS channels. In addition, a new TS spectrum analysis software for a rapid calculation of electron temperature ( T e) and electron density ( n e) was developed. Testing of the RT hardware and data analysis software was successfully completed and benchmarked against the standard, post-shot evaluation. Timing tests were performed showing that the end-to-end processing time was reproducibly below 17 ms for the duration of at least 5 s, meeting a 60 Hz deadline by the laser pulse repetition rate over the length of a NSTX-U discharge. The presented RT framework is designed to be scalable in system size, i.e., incorporation of additional radial channels by solely adding additional RT capable hardware. In conclusion, it is scalable in its operation duration and was continuously running for up to 30 min, making it an attractive solutionmore » for machines with long discharges such as advanced, non-inductive tokamaks or stellarators.« less

Authors:
ORCiD logo [1]; ORCiD logo [2];  [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [3]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Princeton Univ., Princeton, NJ (United States)
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  3. Princeton Univ., Princeton, NJ (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
NSTX-U Team
OSTI Identifier:
1510312
Alternate Identifier(s):
OSTI ID: 1506151
Grant/Contract Number:  
AC02-09Ch11466; SC0015480; SC0015878
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 90; Journal Issue: 4; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Laggner, F. M., Diallo, A., LeBlanc, B. P., Rozenblat, R., Tchilinguirian, G., and Kolemen, E.. A scalable real-time framework for Thomson scattering analysis: Application to NSTX-U. United States: N. p., 2019. Web. doi:10.1063/1.5088248.
Laggner, F. M., Diallo, A., LeBlanc, B. P., Rozenblat, R., Tchilinguirian, G., & Kolemen, E.. A scalable real-time framework for Thomson scattering analysis: Application to NSTX-U. United States. doi:10.1063/1.5088248.
Laggner, F. M., Diallo, A., LeBlanc, B. P., Rozenblat, R., Tchilinguirian, G., and Kolemen, E.. Wed . "A scalable real-time framework for Thomson scattering analysis: Application to NSTX-U". United States. doi:10.1063/1.5088248.
@article{osti_1510312,
title = {A scalable real-time framework for Thomson scattering analysis: Application to NSTX-U},
author = {Laggner, F. M. and Diallo, A. and LeBlanc, B. P. and Rozenblat, R. and Tchilinguirian, G. and Kolemen, E.},
abstractNote = {A detailed description of a prototype setup for real-time (RT) Thomson scattering (TS) analysis is presented and implemented in the multi-point Thomson scattering (MPTS) diagnostic system at the National Spherical Torus Experiment Upgrade (NSTX-U). The data acquisition hardware was upgraded with RT capable electronics (RT-analog digital converters and a RT server) that allow for fast digitization of the laser pulse signal of eight radial MPTS channels. In addition, a new TS spectrum analysis software for a rapid calculation of electron temperature (Te) and electron density (ne) was developed. Testing of the RT hardware and data analysis software was successfully completed and benchmarked against the standard, post-shot evaluation. Timing tests were performed showing that the end-to-end processing time was reproducibly below 17 ms for the duration of at least 5 s, meeting a 60 Hz deadline by the laser pulse repetition rate over the length of a NSTX-U discharge. The presented RT framework is designed to be scalable in system size, i.e., incorporation of additional radial channels by solely adding additional RT capable hardware. In conclusion, it is scalable in its operation duration and was continuously running for up to 30 min, making it an attractive solution for machines with long discharges such as advanced, non-inductive tokamaks or stellarators.},
doi = {10.1063/1.5088248},
journal = {Review of Scientific Instruments},
number = 4,
volume = 90,
place = {United States},
year = {2019},
month = {4}
}

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