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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 codewas run on-demand at a remotely located supercomputer at Argonne Leadership Computing Facility (ALCF, Lemont, Illinois) in support of in-process experiments being performed at DIII-D (San Diego, California). This represents a new paradigm for combining geographically distant experimental and high-performance computing 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 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 min 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 suppression, and may be controlled by adjusting coil currents for the next pulse. ALCF 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 network access frommore » the worker nodes for data transfer. Runs are executed on 252 cores of ALCF's Cooley cluster and the data are available locally at DIII-D within 3 min of triggering. The original SURFMNdesign 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.:
General Atomics, San Diego, CA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE); USDOE Office of Science (SC), Fusion Energy Sciences (FES)
OSTI Identifier:
1437987
Alternate Identifier(s):
OSTI ID: 1475553
Grant/Contract Number:  
FC02-04ER54698; AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Fusion Science and Technology
Additional Journal Information:
Journal Volume: 74; Journal Issue: 1-2; Journal ID: ISSN 1536-1055
Publisher:
American Nuclear Society
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; high-performance computing; real-time queue; remote analysis

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. https://doi.org/10.1080/15361055.2017.1390388
Kostuk, M., Uram, T. D., Evans, T., Orlov, D. M., Papka, M. E., and Schissel, D. 2018. "Automatic Between-Pulse Analysis of DIII-D Experimental Data Performed Remotely on a Supercomputer at Argonne Leadership Computing Facility". United States. https://doi.org/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 codewas run on-demand at a remotely located supercomputer at Argonne Leadership Computing Facility (ALCF, Lemont, Illinois) in support of in-process experiments being performed at DIII-D (San Diego, California). This represents a new paradigm for combining geographically distant experimental and high-performance computing 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 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 min 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 suppression, and may be controlled by adjusting coil currents for the next pulse. ALCF 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 network access from the worker nodes for data transfer. Runs are executed on 252 cores of ALCF's Cooley cluster and the data are available locally at DIII-D within 3 min of triggering. The original SURFMNdesign 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},
url = {https://www.osti.gov/biblio/1437987}, journal = {Fusion Science and Technology},
issn = {1536-1055},
number = 1-2,
volume = 74,
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
journal, April 2011


Study of in-vessel nonaxisymmetric ELM suppression coil concepts for ITER
journal, January 2008


Expanding the Scope of High-Performance Computing Facilities
journal, May 2016


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


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