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Title: Automatic Between-Pulse Analysis of DIII-D Experimental Data Performed Remotely on a Supercomputer at Argonne Leadership Computing Facility

Abstract

For the first time, an automatically triggered, between-pulse fusion science analysis code was run on-demand at a remotely located supercomputer at Argonne Leadership Computing Facility (ALCF, Lemont, IL) in support of in-process experiments being performed at DIII-D (San Diego, CA). This represents a new paradigm for combining geographically distant experimental and high performance computing (HPC) facilities to provide enhanced data analysis that is quickly available to researchers. Enhanced analysis improves the understanding of the current pulse, translating into a more efficient use of experimental resources, and to the quality of the resultant science. The analysis code used here, called SURFMN, calculates the magnetic structure of the plasma using Fourier transform. Increasing the number of Fourier components provides a more accurate determination of the stochastic boundary layer near the plasma edge by better resolving magnetic islands, but requires 26 minutes to complete using local DIII-D resources, putting it well outside the useful time range for between pulse analysis. These islands relate to confinement and edge localized mode (ELM) suppression, and may be controlled by adjusting coil currents for the next pulse. Argonne has ensured on-demand execution of SURFMN by providing a reserved queue, a specialized service that launches the code aftermore » receiving an automatic trigger, and with network access from the worker nodes for data transfer. Runs are executed on 252 cores of ALCF’s Cooley cluster and the data is available locally at DIII-D within three minutes of triggering. The original SURFMN design limits additional improvements with more cores, however our work shows a path forward where codes that benefit from thousands of processors can run between pulses.« less

Authors:
 [1];  [2];  [1];  [3];  [4];  [1]
  1. General Atomics, San Diego, CA (United States)
  2. Argonne National Lab. (ANL), Lemont, IL (United States)
  3. Univ. of California, San Diego, CA (United States)
  4. Argonne National Lab. (ANL), Lemont, IL (United States); Northern Illinois Univ., DeKalb, IL (United States)
Publication Date:
Research Org.:
Dept. of Energy (DOE), Washington DC (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1437987
Grant/Contract Number:  
FC02-04ER54698
Resource Type:
Accepted Manuscript
Journal Name:
Fusion Science and Technology
Additional Journal Information:
Journal Name: Fusion Science and Technology; Journal ID: ISSN 1536-1055
Publisher:
American Nuclear Society
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Kostuk, M., Uram, T. D., Evans, T., Orlov, D. M., Papka, M. E., and Schissel, D. Automatic Between-Pulse Analysis of DIII-D Experimental Data Performed Remotely on a Supercomputer at Argonne Leadership Computing Facility. United States: N. p., 2018. Web. doi:10.1080/15361055.2017.1390388.
Kostuk, M., Uram, T. D., Evans, T., Orlov, D. M., Papka, M. E., & Schissel, D. Automatic Between-Pulse Analysis of DIII-D Experimental Data Performed Remotely on a Supercomputer at Argonne Leadership Computing Facility. United States. doi:10.1080/15361055.2017.1390388.
Kostuk, M., Uram, T. D., Evans, T., Orlov, D. M., Papka, M. E., and Schissel, D. Thu . "Automatic Between-Pulse Analysis of DIII-D Experimental Data Performed Remotely on a Supercomputer at Argonne Leadership Computing Facility". United States. doi:10.1080/15361055.2017.1390388. https://www.osti.gov/servlets/purl/1437987.
@article{osti_1437987,
title = {Automatic Between-Pulse Analysis of DIII-D Experimental Data Performed Remotely on a Supercomputer at Argonne Leadership Computing Facility},
author = {Kostuk, M. and Uram, T. D. and Evans, T. and Orlov, D. M. and Papka, M. E. and Schissel, D.},
abstractNote = {For the first time, an automatically triggered, between-pulse fusion science analysis code was run on-demand at a remotely located supercomputer at Argonne Leadership Computing Facility (ALCF, Lemont, IL) in support of in-process experiments being performed at DIII-D (San Diego, CA). This represents a new paradigm for combining geographically distant experimental and high performance computing (HPC) facilities to provide enhanced data analysis that is quickly available to researchers. Enhanced analysis improves the understanding of the current pulse, translating into a more efficient use of experimental resources, and to the quality of the resultant science. The analysis code used here, called SURFMN, calculates the magnetic structure of the plasma using Fourier transform. Increasing the number of Fourier components provides a more accurate determination of the stochastic boundary layer near the plasma edge by better resolving magnetic islands, but requires 26 minutes to complete using local DIII-D resources, putting it well outside the useful time range for between pulse analysis. These islands relate to confinement and edge localized mode (ELM) suppression, and may be controlled by adjusting coil currents for the next pulse. Argonne has ensured on-demand execution of SURFMN by providing a reserved queue, a specialized service that launches the code after receiving an automatic trigger, and with network access from the worker nodes for data transfer. Runs are executed on 252 cores of ALCF’s Cooley cluster and the data is available locally at DIII-D within three minutes of triggering. The original SURFMN design limits additional improvements with more cores, however our work shows a path forward where codes that benefit from thousands of processors can run between pulses.},
doi = {10.1080/15361055.2017.1390388},
journal = {Fusion Science and Technology},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

Fig. 1 Fig. 1: During 1-5 seconds of DIII-D plasma discharge number 169453, a comparison of the vacuum island overlap width (VIOW), a unitless fraction of the plasma's edge that is magnetically coupled to the divertor, between low Fourier resolution SURFMN (32 x 32 modes, run at DIII-D, shown as a thinmore » black line), high Fourier resolution (128 x 128 modes, run at ALCF, shown as a thick red line), and an extremely high resolution (256 x 256 modes, shown as a thin blue), is shown. Note the errors in both the peak magnitude and the timing of the VIOW at low resolution, while the extremely high resolution offers little additional benefit.« less

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Works referenced in this record:

Reconstruction of current profile parameters and plasma shapes in tokamaks
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A design retrospective of the DIII-D tokamak
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Real time equilibrium reconstruction for tokamak discharge control
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Overview of Edge-Localized Mode Control in Tokamak Plasmas
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Study of in-vessel nonaxisymmetric ELM suppression coil concepts for ITER
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Expanding the Scope of High-Performance Computing Facilities
journal, May 2016

  • Uram, Thomas D.; Papka, Michael E.
  • Computing in Science & Engineering, Vol. 18, Issue 3
  • DOI: 10.1109/MCSE.2016.53

Effect of island overlap on edge localized mode suppression by resonant magnetic perturbations in DIII-D
journal, May 2008

  • Fenstermacher, M. E.; Evans, T. E.; Osborne, T. H.
  • Physics of Plasmas, Vol. 15, Issue 5
  • DOI: 10.1063/1.2901064

    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.