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This content will become publicly available on January 22, 2019

Title: OMFIT Tokamak Profile Data Fitting and Physics Analysis

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:
Grant/Contract Number:
AC02-09CH11466; FC02-04ER54698
Type:
Accepted Manuscript
Journal Name:
Fusion Science and Technology
Additional Journal Information:
Conference: IAEA Technical Meeting on Fusion Data Processing, Validation and Analysis, Boston, MA, June 1, 2017.; Journal ID: ISSN 1536-1055
Publisher:
American Nuclear Society
Research Org:
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; One Modelling Framework for Iintegrated Tasks; profile fitting; integrated modeling
OSTI Identifier:
1411210