skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: OMFIT Tokamak Profile Data Fitting and Physics Analysis

Abstract

Here, One Modeling Framework for Integrated Tasks (OMFIT) has been used to develop a consistent tool for interfacing with, mapping, visualizing, and fitting tokamak profile measurements. OMFIT is used to integrate the many diverse diagnostics on multiple tokamak devices into a regular data structure, consistently applying spatial and temporal treatments to each channel of data. Tokamak data are fundamentally time dependent and are treated so from the start, with front-loaded and logic-based manipulations such as filtering based on the identification of edge-localized modes (ELMs) that commonly scatter data. Fitting is general in its approach, and tailorable in its application in order to address physics constraints and handle the multiple spatial and temporal scales involved. Although community standard one-dimensional fitting is supported, including scale length–fitting and fitting polynomial-exponential blends to capture the H-mode pedestal, OMFITprofiles includes two-dimensional (2-D) fitting using bivariate splines or radial basis functions. These 2-D fits produce regular evolutions in time, removing jitter that has historically been smoothed ad hoc in transport applications. Profiles interface directly with a wide variety of models within the OMFIT framework, providing the inputs for TRANSP, kinetic-EFIT 2-D equilibrium, and GPEC three-dimensional equilibrium calculations. he OMFITprofiles tool’s rapid and comprehensive analysis of dynamicmore » plasma profiles thus provides the critical link between raw tokamak data and simulations necessary for physics understanding.« less

Authors:
ORCiD logo [1];  [1];  [1];  [2];  [2];  [2]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
Contributing Org.:
General Atomics, San Diego, CA (United States)
OSTI Identifier:
1411210
Alternate Identifier(s):
OSTI ID: 1374807
Grant/Contract Number:  
AC02-09CH11466; FC02-04ER54698
Resource Type:
Accepted Manuscript
Journal Name:
Fusion Science and Technology
Additional Journal Information:
Journal Volume: 74; Journal Issue: 1-2; Conference: IAEA Technical Meeting on Fusion Data Processing, Validation and Analysis, Boston, MA (United States), 1 June 2017; Journal ID: ISSN 1536-1055
Publisher:
American Nuclear Society
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; One Modelling Framework for Iintegrated Tasks; profile fitting; integrated modeling; OMFIT

Citation Formats

Logan, N. C., Grierson, B. A., Haskey, S. R., Smith, S. P., Meneghini, O., and Eldon, D. OMFIT Tokamak Profile Data Fitting and Physics Analysis. United States: N. p., 2018. Web. doi:10.1080/15361055.2017.1386943.
Logan, N. C., Grierson, B. A., Haskey, S. R., Smith, S. P., Meneghini, O., & Eldon, D. OMFIT Tokamak Profile Data Fitting and Physics Analysis. United States. doi:10.1080/15361055.2017.1386943.
Logan, N. C., Grierson, B. A., Haskey, S. R., Smith, S. P., Meneghini, O., and Eldon, D. Mon . "OMFIT Tokamak Profile Data Fitting and Physics Analysis". United States. doi:10.1080/15361055.2017.1386943. https://www.osti.gov/servlets/purl/1411210.
@article{osti_1411210,
title = {OMFIT Tokamak Profile Data Fitting and Physics Analysis},
author = {Logan, N. C. and Grierson, B. A. and Haskey, S. R. and Smith, S. P. and Meneghini, O. and Eldon, D.},
abstractNote = {Here, One Modeling Framework for Integrated Tasks (OMFIT) has been used to develop a consistent tool for interfacing with, mapping, visualizing, and fitting tokamak profile measurements. OMFIT is used to integrate the many diverse diagnostics on multiple tokamak devices into a regular data structure, consistently applying spatial and temporal treatments to each channel of data. Tokamak data are fundamentally time dependent and are treated so from the start, with front-loaded and logic-based manipulations such as filtering based on the identification of edge-localized modes (ELMs) that commonly scatter data. Fitting is general in its approach, and tailorable in its application in order to address physics constraints and handle the multiple spatial and temporal scales involved. Although community standard one-dimensional fitting is supported, including scale length–fitting and fitting polynomial-exponential blends to capture the H-mode pedestal, OMFITprofiles includes two-dimensional (2-D) fitting using bivariate splines or radial basis functions. These 2-D fits produce regular evolutions in time, removing jitter that has historically been smoothed ad hoc in transport applications. Profiles interface directly with a wide variety of models within the OMFIT framework, providing the inputs for TRANSP, kinetic-EFIT 2-D equilibrium, and GPEC three-dimensional equilibrium calculations. he OMFITprofiles tool’s rapid and comprehensive analysis of dynamic plasma profiles thus provides the critical link between raw tokamak data and simulations necessary for physics understanding.},
doi = {10.1080/15361055.2017.1386943},
journal = {Fusion Science and Technology},
number = 1-2,
volume = 74,
place = {United States},
year = {2018},
month = {1}
}

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

Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

Save / Share:

Works referenced in this record:

Integrated modeling applications for tokamak experiments with OMFIT
journal, July 2015


Computation of three-dimensional tokamak and spherical torus equilibria
journal, May 2007

  • Park, Jong-kyu; Boozer, Allen H.; Glasser, Alan H.
  • Physics of Plasmas, Vol. 14, Issue 5
  • DOI: 10.1063/1.2732170

A Code that Simulates Fast-Ion D α and Neutral Particle Measurements
journal, September 2011


Controlling marginally detached divertor plasmas
journal, May 2017


Reconstruction of current profile parameters and plasma shapes in tokamaks
journal, November 1985


Identifying the location of the OMP separatrix in DIII-D using power accounting
journal, August 2015


Self-consistent perturbed equilibrium with neoclassical toroidal torque in tokamaks
journal, March 2017

  • Park, Jong-Kyu; Logan, Nikolas C.
  • Physics of Plasmas, Vol. 24, Issue 3
  • DOI: 10.1063/1.4977898

Spectroscopic study of edge poloidal rotation and radial electric fields in the DIII‐D tokamak (invited)
journal, October 1990

  • Groebner, R. J.; Burrell, K. H.; Gohil, P.
  • Review of Scientific Instruments, Vol. 61, Issue 10
  • DOI: 10.1063/1.1141777

Orchestrating TRANSP Simulations for Interpretative and Predictive Tokamak Modeling with OMFIT
journal, February 2018