Analysis of electron cyclotron emission with extended electron cyclotron forward modeling

S. S. Denk; R. Fischer; H. M. Smith; P. Helander; O. Maj; E. Poli; J. Stober; U. Stroth; W. Suttrop; E. Westerhof; M. Willensdorfer

doi:10.1088/1361-6587/aadb2f

Analysis of electron cyclotron emission with extended electron cyclotron forward modeling

S. S. Denk, R. Fischer, H. M. Smith, P. Helander, O. Maj, E. Poli, J. Stober, U. Stroth, W. Suttrop, E. Westerhof, M. Willensdorfer

Chair of Plasmarand- und Divertorphysik

Research output: Contribution to journal › Article › peer-review

33 Scopus citations

Abstract

At the ASDEX Upgrade tokamak the electron temperature (T _e) profile is estimated from electron cyclotron emission (ECE) using radiation transport forward modeling within the integrated data analysis scheme. For the interpretation of ECE measurements in high plasmas, it was necessary to upgrade the forward model with a fully relativistic absorption coefficient including the relativistic Maxwell-Jüttner distribution. This model intrinsically enables the interpretation of ECE measurements affected by the so-called 'pseudo radial displacement' or by harmonic overlap. A numerically efficient implementation allows for the analysis of everyday ECE measurements at ASDEX Upgrade. Various ASDEX Upgrade plasma scenarios are discussed highlighting the benefits of the present radiation transport forward modeling for routine analysis.

Original language	English
Article number	105010
Journal	Plasma Physics and Controlled Fusion
Volume	60
Issue number	10
DOIs	https://doi.org/10.1088/1361-6587/aadb2f
State	Published - 7 Sep 2018

Keywords

data analysis
electron cyclotron emission
forward modeling
radiation transport

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10.1088/1361-6587/aadb2f

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title = "Analysis of electron cyclotron emission with extended electron cyclotron forward modeling",

abstract = "At the ASDEX Upgrade tokamak the electron temperature (T e) profile is estimated from electron cyclotron emission (ECE) using radiation transport forward modeling within the integrated data analysis scheme. For the interpretation of ECE measurements in high plasmas, it was necessary to upgrade the forward model with a fully relativistic absorption coefficient including the relativistic Maxwell-J{\"u}ttner distribution. This model intrinsically enables the interpretation of ECE measurements affected by the so-called 'pseudo radial displacement' or by harmonic overlap. A numerically efficient implementation allows for the analysis of everyday ECE measurements at ASDEX Upgrade. Various ASDEX Upgrade plasma scenarios are discussed highlighting the benefits of the present radiation transport forward modeling for routine analysis.",

keywords = "data analysis, electron cyclotron emission, forward modeling, radiation transport",

author = "Denk, {S. S.} and R. Fischer and Smith, {H. M.} and P. Helander and O. Maj and E. Poli and J. Stober and U. Stroth and W. Suttrop and E. Westerhof and M. Willensdorfer",

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doi = "10.1088/1361-6587/aadb2f",

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T1 - Analysis of electron cyclotron emission with extended electron cyclotron forward modeling

AU - Denk, S. S.

AU - Fischer, R.

AU - Smith, H. M.

AU - Helander, P.

AU - Maj, O.

AU - Poli, E.

AU - Stober, J.

AU - Stroth, U.

AU - Suttrop, W.

AU - Westerhof, E.

AU - Willensdorfer, M.

PY - 2018/9/7

Y1 - 2018/9/7

N2 - At the ASDEX Upgrade tokamak the electron temperature (T e) profile is estimated from electron cyclotron emission (ECE) using radiation transport forward modeling within the integrated data analysis scheme. For the interpretation of ECE measurements in high plasmas, it was necessary to upgrade the forward model with a fully relativistic absorption coefficient including the relativistic Maxwell-Jüttner distribution. This model intrinsically enables the interpretation of ECE measurements affected by the so-called 'pseudo radial displacement' or by harmonic overlap. A numerically efficient implementation allows for the analysis of everyday ECE measurements at ASDEX Upgrade. Various ASDEX Upgrade plasma scenarios are discussed highlighting the benefits of the present radiation transport forward modeling for routine analysis.

AB - At the ASDEX Upgrade tokamak the electron temperature (T e) profile is estimated from electron cyclotron emission (ECE) using radiation transport forward modeling within the integrated data analysis scheme. For the interpretation of ECE measurements in high plasmas, it was necessary to upgrade the forward model with a fully relativistic absorption coefficient including the relativistic Maxwell-Jüttner distribution. This model intrinsically enables the interpretation of ECE measurements affected by the so-called 'pseudo radial displacement' or by harmonic overlap. A numerically efficient implementation allows for the analysis of everyday ECE measurements at ASDEX Upgrade. Various ASDEX Upgrade plasma scenarios are discussed highlighting the benefits of the present radiation transport forward modeling for routine analysis.

KW - data analysis

KW - electron cyclotron emission

KW - forward modeling

KW - radiation transport

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U2 - 10.1088/1361-6587/aadb2f

DO - 10.1088/1361-6587/aadb2f

M3 - Article

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SN - 0741-3335

VL - 60

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 10

M1 - 105010

ER -

Analysis of electron cyclotron emission with extended electron cyclotron forward modeling

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Keywords

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