Parameter estimation in a tokamak transport model and application to l- and ff-mode simulations

Ji Qiang; Clifford E. Singer

doi:10.1109/27.536566

Parameter estimation in a tokamak transport model and application to l- and ff-mode simulations

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Abstract

A systematic parameter estimation method has been established and applied to estimating a priori uncertain multipliers of flux formulas in a gyro-Bohm tokaniak transport model. Results from simulating two tokamak discharge profiles with the model calibrated here arc shown. The method used here can deal with limited and relatively uncertain experimental data by using estimates of prior knowledge concerning the accuracy of the data. Confidence regions are given to assess the accuracy of estimators. The estimated multipliers are much larger than in a similar study using a nongyro-Bohm transport model [12] suggesting that mechanisms, in addition to early estimates of Ex B driven fluxes from resistive ballooning and quasi-linear drift/r/; turbulence, are needed for a complete theoretical model of flux surface-averaged transport in tokamaks.

Original language	English (US)
Pages (from-to)	1202-1207
Number of pages	6
Journal	IEEE Transactions on Plasma Science
Volume	24
Issue number	4
DOIs	https://doi.org/10.1109/27.536566
State	Published - 1996

ASJC Scopus subject areas

Nuclear and High Energy Physics
Condensed Matter Physics

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10.1109/27.536566

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title = "Parameter estimation in a tokamak transport model and application to l- and ff-mode simulations",

abstract = "A systematic parameter estimation method has been established and applied to estimating a priori uncertain multipliers of flux formulas in a gyro-Bohm tokaniak transport model. Results from simulating two tokamak discharge profiles with the model calibrated here arc shown. The method used here can deal with limited and relatively uncertain experimental data by using estimates of prior knowledge concerning the accuracy of the data. Confidence regions are given to assess the accuracy of estimators. The estimated multipliers are much larger than in a similar study using a nongyro-Bohm transport model [12] suggesting that mechanisms, in addition to early estimates of Ex B driven fluxes from resistive ballooning and quasi-linear drift/r/; turbulence, are needed for a complete theoretical model of flux surface-averaged transport in tokamaks.",

author = "Ji Qiang and Singer, {Clifford E.}",

note = "Funding Information: Manuscript received August 5, 1995; revised April 30, 1996. This work was supported in part by the U.S. Department of Energy under Grant DE-FG02-88ER53269. The authors are with the Department of Nuclear Engineering, University of Illinois, Urbana, IL 61801 USA (e-mail: [email protected]). Publisher Item Identifier S 0093-3813(96)06641-6.",

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T1 - Parameter estimation in a tokamak transport model and application to l- and ff-mode simulations

AU - Qiang, Ji

AU - Singer, Clifford E.

N1 - Funding Information: Manuscript received August 5, 1995; revised April 30, 1996. This work was supported in part by the U.S. Department of Energy under Grant DE-FG02-88ER53269. The authors are with the Department of Nuclear Engineering, University of Illinois, Urbana, IL 61801 USA (e-mail: [email protected]). Publisher Item Identifier S 0093-3813(96)06641-6.

PY - 1996

Y1 - 1996

N2 - A systematic parameter estimation method has been established and applied to estimating a priori uncertain multipliers of flux formulas in a gyro-Bohm tokaniak transport model. Results from simulating two tokamak discharge profiles with the model calibrated here arc shown. The method used here can deal with limited and relatively uncertain experimental data by using estimates of prior knowledge concerning the accuracy of the data. Confidence regions are given to assess the accuracy of estimators. The estimated multipliers are much larger than in a similar study using a nongyro-Bohm transport model [12] suggesting that mechanisms, in addition to early estimates of Ex B driven fluxes from resistive ballooning and quasi-linear drift/r/; turbulence, are needed for a complete theoretical model of flux surface-averaged transport in tokamaks.

AB - A systematic parameter estimation method has been established and applied to estimating a priori uncertain multipliers of flux formulas in a gyro-Bohm tokaniak transport model. Results from simulating two tokamak discharge profiles with the model calibrated here arc shown. The method used here can deal with limited and relatively uncertain experimental data by using estimates of prior knowledge concerning the accuracy of the data. Confidence regions are given to assess the accuracy of estimators. The estimated multipliers are much larger than in a similar study using a nongyro-Bohm transport model [12] suggesting that mechanisms, in addition to early estimates of Ex B driven fluxes from resistive ballooning and quasi-linear drift/r/; turbulence, are needed for a complete theoretical model of flux surface-averaged transport in tokamaks.

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Parameter estimation in a tokamak transport model and application to l- and ff-mode simulations

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