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Title: OMFIT Tokamak Profile Data, Fitting and Physics Analysis

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 is fundamentally time dependent and is treated so from the start, with front-loaded and logic-based manipulations such as filtering based on the identification of Edge Localized Modes 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 1D fitting is supported, including scale length fitting and fitting polynomial-exponential blends to capture the H-mode pedestal, OMFITprofiles includes 2D fitting using bivariate splines or radial basis functions. These 2D 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 2D equilibrium and GPEC 3D equilibrium calculations. The OMFIT profile tool’s rapid and comprehensive analysis of dynamic plasmamore » profiles thus provides the critical link between raw tokamak data and simulations necessary for physics understanding.« less
Authors:
 [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:
Grant/Contract Number:
FC02-04ER54698; AC02-09CH11466
Type:
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
Research Org:
General Atomics, San Diego, CA (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
Contributing Orgs:
General Atomics, San Diego, CA (United States)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; OMFIT; Profile Fitting; Integrated Modeling; One Modelling Framework for Iintegrated Tasks; profile fitting; integrated modeling
OSTI Identifier:
1411210
Alternate Identifier(s):
OSTI ID: 1374807

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., 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.. 2018. "OMFIT Tokamak Profile Data, Fitting and Physics Analysis". United States. doi:10.1080/15361055.2017.1386943.
@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 = {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 is fundamentally time dependent and is treated so from the start, with front-loaded and logic-based manipulations such as filtering based on the identification of Edge Localized Modes 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 1D fitting is supported, including scale length fitting and fitting polynomial-exponential blends to capture the H-mode pedestal, OMFITprofiles includes 2D fitting using bivariate splines or radial basis functions. These 2D 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 2D equilibrium and GPEC 3D equilibrium calculations. The OMFIT profile 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}
}