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

Title: OMFIT Tokamak Profile Data, Fitting and Physics Analysis

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:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1414902
DOE Contract Number:
DE-AC02-09-CH11466
Resource Type:
Conference
Resource Relation:
Conference: 1 June, 2017 IAEA Technical Meeting on Fusion Data Processing, Validation & Analysis Boston, USA
Country of Publication:
United States
Language:
English

Citation Formats

Logan, Nikolas, Grierson, Brian A., Haskey, Shaun, Smith, S.P., Meneghini, O., and Eldon, D. OMFIT Tokamak Profile Data, Fitting and Physics Analysis. United States: N. p., 2017. Web.
Logan, Nikolas, Grierson, Brian A., Haskey, Shaun, Smith, S.P., Meneghini, O., & Eldon, D. OMFIT Tokamak Profile Data, Fitting and Physics Analysis. United States.
Logan, Nikolas, Grierson, Brian A., Haskey, Shaun, Smith, S.P., Meneghini, O., and Eldon, D. 2017. "OMFIT Tokamak Profile Data, Fitting and Physics Analysis". United States. doi:. https://www.osti.gov/servlets/purl/1414902.
@article{osti_1414902,
title = {OMFIT Tokamak Profile Data, Fitting and Physics Analysis},
author = {Logan, Nikolas and Grierson, Brian A. and Haskey, Shaun and Smith, S.P. and Meneghini, O. and Eldon, D.},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2017,
month = 6
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:
  • Using the ACCOME and PEST II codes, noninductive current drive scenarios and their stability are studied in the proposed TPX experiment. The current drive techniques include neutral beams as well as lower hybrid and fast magnetosonic waves. The non-standard cases studied include inverted [ital q]([ital r]) profiles (reversed-shear scenario), reversed edge current profiles, and second-stable scenarios [[ital q](0)[gt]2]. The MHD stability of some of these scenarios has been assessed. The power requirements for TPX are established.
  • To investigate the possibility of using HOM signals induced in SC cavities as beam and cavity diagnostics, narrow band (20 MHz) data was recorded around the strong TE111-6(6{pi}/9-like) dipole modes (1.7 GHz) in the 40 L-band (1.3 GHz) cavities at the DESY TTF facility. The analyses of these data have so far focused on using a Singular Value Decomposition (SVD) technique to correlate the signals with each other and data from conventional BPMs to show the dipole signals provide an alternate means of measuring the beam trajectory. However, these analyses do not extract the modal information (i.e., frequencies and Q'smore » of the nearly degenerate horizontal and vertical modes). In this paper, we described a method to fit the signal frequency spectrum to obtain this information, and then use the resulting mode amplitudes and phases together with conventional BPM data to determine the mode polarizations and relative centers and tilts. Compared with the SVD analysis, this method is more physical, and can also be used to obtain the beam position and trajectory angle.« less
  • Abstract not provided.
  • Abstract not provided.
  • Small angle scattering is a common technique for investigating fluctuations in materials, for sizes ranging from about ten to a few hundred Angstroms. The technique could be more widely used if data analysis were more convenient; however, expressions relating the small angle scattered intensity to materials parameters of interest tend to be complicated. Non-linear regression fitting of experimental small angle scattering data from metallurgical systems is discussed, and the analysis procedure is demonstrated for two models on data from a Ni-Si alloy undergoing phase separation. It is concluded that if sufficient information is available to permit the proper model tomore » be identified, quantitative values for the relevant materials parameters can be extracted in a rather routine manner, provided the parameters are not too closely coupled.« less