First results on modeling of ITER infrared images

M. Kočan; R. Reichle; M. H. Aumeunier; J. P. Gunn; S. Kajita; F. Le Guern; S. W. Lisgo; T. Loarer; A. S. Kukushkin; A. Sashala Naik; F. Rigollet; B. Stratton

doi:10.1088/0031-8949/T167/1/014047

First results on modeling of ITER infrared images

M. Kočan
, R. Reichle
, M. H. Aumeunier
, J. P. Gunn
, S. Kajita
, F. Le Guern
, S. W. Lisgo
, T. Loarer
, A. S. Kukushkin
, A. Sashala Naik
, F. Rigollet
, B. Stratton

PPPL NSTX

Princeton University

Research output: Contribution to journal › Conference article › peer-review

Abstract

Infrared (IR) images of the ITER wide angle viewing system are modeled for the baseline plasma equilibrium and partially detached tungsten divertor, taking into account the three-dimensional structure of the first wall and the divertor. The modeling includes a comprehensive chain of calculations from the heat load specifications up to the synthetic, reflection-free IR images of the surface temperature, T _surf. The effect of the optical blur due to finite IR detector size and diffraction/aberrations - approximated by a Gaussian filter - on the measured T _surf is investigated. The optical blur characterized by σ = 0.7 pixel (approximately twice the diffraction limit) leads to underestimation of T _surf,max on the inner vertical divertor target and near the upper X-point by <6% and <4%, respectively. This is within the required measurement accuracy of 10%. Larger underestimation of T _surf,max (<12%) is observed on the outer vertical divertor target. The study demonstrates the importance of keeping the performance of the optical system as close as possible to the diffraction limit.

Original language	American English
Article number	014047
Journal	Physica Scripta
Volume	2016
Issue number	T167
DOIs	https://doi.org/10.1088/0031-8949/T167/1/014047
State	Published - Jan 25 2016
Event	15th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2015 - Aix-en-Provence, France Duration: May 18 2015 → May 22 2015

ASJC Scopus subject areas

General Physics and Astronomy

Keywords

ITER
infrared diagnostic
surface temperature

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10.1088/0031-8949/T167/1/014047

Cite this

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title = "First results on modeling of ITER infrared images",

abstract = "Infrared (IR) images of the ITER wide angle viewing system are modeled for the baseline plasma equilibrium and partially detached tungsten divertor, taking into account the three-dimensional structure of the first wall and the divertor. The modeling includes a comprehensive chain of calculations from the heat load specifications up to the synthetic, reflection-free IR images of the surface temperature, T surf. The effect of the optical blur due to finite IR detector size and diffraction/aberrations - approximated by a Gaussian filter - on the measured T surf is investigated. The optical blur characterized by σ = 0.7 pixel (approximately twice the diffraction limit) leads to underestimation of T surf,max on the inner vertical divertor target and near the upper X-point by <6\% and <4\%, respectively. This is within the required measurement accuracy of 10\%. Larger underestimation of T surf,max (<12\%) is observed on the outer vertical divertor target. The study demonstrates the importance of keeping the performance of the optical system as close as possible to the diffraction limit.",

keywords = "ITER, infrared diagnostic, surface temperature",

author = "M. Ko{\v c}an and R. Reichle and Aumeunier, \{M. H.\} and Gunn, \{J. P.\} and S. Kajita and \{Le Guern\}, F. and Lisgo, \{S. W.\} and T. Loarer and Kukushkin, \{A. S.\} and \{Sashala Naik\}, A. and F. Rigollet and B. Stratton",

note = "Publisher Copyright: {\textcopyright} 2016 The Royal Swedish Academy of Sciences.; 15th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2015 ; Conference date: 18-05-2015 Through 22-05-2015",

year = "2016",

month = jan,

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doi = "10.1088/0031-8949/T167/1/014047",

language = "American English",

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TY - JOUR

T1 - First results on modeling of ITER infrared images

AU - Kočan, M.

AU - Reichle, R.

AU - Aumeunier, M. H.

AU - Gunn, J. P.

AU - Kajita, S.

AU - Le Guern, F.

AU - Lisgo, S. W.

AU - Loarer, T.

AU - Kukushkin, A. S.

AU - Sashala Naik, A.

AU - Rigollet, F.

AU - Stratton, B.

PY - 2016/1/25

Y1 - 2016/1/25

N2 - Infrared (IR) images of the ITER wide angle viewing system are modeled for the baseline plasma equilibrium and partially detached tungsten divertor, taking into account the three-dimensional structure of the first wall and the divertor. The modeling includes a comprehensive chain of calculations from the heat load specifications up to the synthetic, reflection-free IR images of the surface temperature, T surf. The effect of the optical blur due to finite IR detector size and diffraction/aberrations - approximated by a Gaussian filter - on the measured T surf is investigated. The optical blur characterized by σ = 0.7 pixel (approximately twice the diffraction limit) leads to underestimation of T surf,max on the inner vertical divertor target and near the upper X-point by <6% and <4%, respectively. This is within the required measurement accuracy of 10%. Larger underestimation of T surf,max (<12%) is observed on the outer vertical divertor target. The study demonstrates the importance of keeping the performance of the optical system as close as possible to the diffraction limit.

AB - Infrared (IR) images of the ITER wide angle viewing system are modeled for the baseline plasma equilibrium and partially detached tungsten divertor, taking into account the three-dimensional structure of the first wall and the divertor. The modeling includes a comprehensive chain of calculations from the heat load specifications up to the synthetic, reflection-free IR images of the surface temperature, T surf. The effect of the optical blur due to finite IR detector size and diffraction/aberrations - approximated by a Gaussian filter - on the measured T surf is investigated. The optical blur characterized by σ = 0.7 pixel (approximately twice the diffraction limit) leads to underestimation of T surf,max on the inner vertical divertor target and near the upper X-point by <6% and <4%, respectively. This is within the required measurement accuracy of 10%. Larger underestimation of T surf,max (<12%) is observed on the outer vertical divertor target. The study demonstrates the importance of keeping the performance of the optical system as close as possible to the diffraction limit.

KW - ITER

KW - infrared diagnostic

KW - surface temperature

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U2 - 10.1088/0031-8949/T167/1/014047

DO - 10.1088/0031-8949/T167/1/014047

M3 - Conference article

SN - 0281-1847

VL - 2016

JO - Physica Scripta

JF - Physica Scripta

IS - T167

M1 - 014047

T2 - 15th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2015

Y2 - 18 May 2015 through 22 May 2015

ER -

First results on modeling of ITER infrared images

Abstract

ASJC Scopus subject areas

Keywords

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