Demonstration of improvement in 2D tomographic reconstructions of filtered cameras in the JET ITER-like wall divertor due to corrected interpretation of reflections

J. Karhunen; M. Carr; J. R. Harrison; B. Lomanowski; I. Balboa; P. Carvalho; M. Groth; A. Huber; G. F. Matthews; A. Meakins; S. Silburn; JET Contributors

doi:10.1088/1748-0221/14/10/C10013

Demonstration of improvement in 2D tomographic reconstructions of filtered cameras in the JET ITER-like wall divertor due to corrected interpretation of reflections

J. Karhunen^*, M. Carr, J. R. Harrison, B. Lomanowski, I. Balboa, P. Carvalho, M. Groth, A. Huber, G. F. Matthews, A. Meakins, S. Silburn, JET Contributors

^*Corresponding author for this work

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

Abstract

Improved localization of emission and reduction of artefacts have been achieved in tomographic reconstructions of the tangentially viewing spectroscopic divertor cameras in JET by introducing the contribution of reflections from the metallic wall surfaces in the geometry definition of the tomography process. The reconstructions thus describe the plasma emission only without features arising from misinterpreted reflected light. Benchmarks with synthetic emission distributions showed accurate reproduction within 10% and 1-2% of the reference emission distributions and camera images, respectively, when the reflection correction was applied. Without the correction, the reconstructed emission was observed to concentrate from the divertor volume towards the wall surfaces together with bright emission artefacts appearing in front of the surfaces to reproduce the reflections seen in the camera images.

Original language	English
Article number	10013
Number of pages	8
Journal	Journal of Instrumentation
Volume	14
DOIs	https://doi.org/10.1088/1748-0221/14/10/C10013
Publication status	Published - Oct 2019
MoE publication type	A1 Journal article-refereed
Event	European Conference on Plasma Diagnostics - Lisbon, Portugal Duration: 6 May 2019 → 10 May 2019 Conference number: 3

Keywords

Nuclear instruments and methods for hot plasma diagnostics
Plasma diagnostics - high speed photography
Plasma diagnostics - interferometry, spectroscopy and imaging

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10.1088/1748-0221/14/10/C10013

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Karhunen, J., Carr, M., Harrison, J. R., Lomanowski, B., Balboa, I., Carvalho, P., Groth, M., Huber, A., Matthews, G. F., Meakins, A., Silburn, S., & JET Contributors (2019). Demonstration of improvement in 2D tomographic reconstructions of filtered cameras in the JET ITER-like wall divertor due to corrected interpretation of reflections. Journal of Instrumentation, 14, [10013]. https://doi.org/10.1088/1748-0221/14/10/C10013

Karhunen, J. ; Carr, M. ; Harrison, J. R. ; Lomanowski, B. ; Balboa, I. ; Carvalho, P. ; Groth, M. ; Huber, A. ; Matthews, G. F. ; Meakins, A. ; Silburn, S. ; JET Contributors. / Demonstration of improvement in 2D tomographic reconstructions of filtered cameras in the JET ITER-like wall divertor due to corrected interpretation of reflections. In: Journal of Instrumentation. 2019 ; Vol. 14.

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title = "Demonstration of improvement in 2D tomographic reconstructions of filtered cameras in the JET ITER-like wall divertor due to corrected interpretation of reflections",

abstract = "Improved localization of emission and reduction of artefacts have been achieved in tomographic reconstructions of the tangentially viewing spectroscopic divertor cameras in JET by introducing the contribution of reflections from the metallic wall surfaces in the geometry definition of the tomography process. The reconstructions thus describe the plasma emission only without features arising from misinterpreted reflected light. Benchmarks with synthetic emission distributions showed accurate reproduction within 10% and 1-2% of the reference emission distributions and camera images, respectively, when the reflection correction was applied. Without the correction, the reconstructed emission was observed to concentrate from the divertor volume towards the wall surfaces together with bright emission artefacts appearing in front of the surfaces to reproduce the reflections seen in the camera images.",

keywords = "Nuclear instruments and methods for hot plasma diagnostics, Plasma diagnostics - high speed photography, Plasma diagnostics - interferometry, spectroscopy and imaging",

author = "J. Karhunen and M. Carr and Harrison, {J. R.} and B. Lomanowski and I. Balboa and P. Carvalho and M. Groth and A. Huber and Matthews, {G. F.} and A. Meakins and S. Silburn and {JET Contributors}",

year = "2019",

month = oct,

doi = "10.1088/1748-0221/14/10/C10013",

language = "English",

volume = "14",

journal = "Journal of Instrumentation",

issn = "1748-0221",

publisher = "IOP Publishing Ltd.",

note = "European Conference on Plasma Diagnostics, ECPD ; Conference date: 06-05-2019 Through 10-05-2019",

}

Karhunen, J, Carr, M, Harrison, JR, Lomanowski, B, Balboa, I, Carvalho, P, Groth, M, Huber, A, Matthews, GF, Meakins, A, Silburn, S & JET Contributors 2019, 'Demonstration of improvement in 2D tomographic reconstructions of filtered cameras in the JET ITER-like wall divertor due to corrected interpretation of reflections', Journal of Instrumentation, vol. 14, 10013. https://doi.org/10.1088/1748-0221/14/10/C10013

Demonstration of improvement in 2D tomographic reconstructions of filtered cameras in the JET ITER-like wall divertor due to corrected interpretation of reflections. / Karhunen, J.; Carr, M.; Harrison, J. R.; Lomanowski, B.; Balboa, I.; Carvalho, P.; Groth, M.; Huber, A.; Matthews, G. F.; Meakins, A.; Silburn, S.; JET Contributors.

In: Journal of Instrumentation, Vol. 14, 10013, 10.2019.

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

TY - JOUR

T1 - Demonstration of improvement in 2D tomographic reconstructions of filtered cameras in the JET ITER-like wall divertor due to corrected interpretation of reflections

AU - Karhunen, J.

AU - Carr, M.

AU - Harrison, J. R.

AU - Lomanowski, B.

AU - Balboa, I.

AU - Carvalho, P.

AU - Groth, M.

AU - Huber, A.

AU - Matthews, G. F.

AU - Meakins, A.

AU - Silburn, S.

AU - JET Contributors

N1 - Conference code: 3

PY - 2019/10

Y1 - 2019/10

N2 - Improved localization of emission and reduction of artefacts have been achieved in tomographic reconstructions of the tangentially viewing spectroscopic divertor cameras in JET by introducing the contribution of reflections from the metallic wall surfaces in the geometry definition of the tomography process. The reconstructions thus describe the plasma emission only without features arising from misinterpreted reflected light. Benchmarks with synthetic emission distributions showed accurate reproduction within 10% and 1-2% of the reference emission distributions and camera images, respectively, when the reflection correction was applied. Without the correction, the reconstructed emission was observed to concentrate from the divertor volume towards the wall surfaces together with bright emission artefacts appearing in front of the surfaces to reproduce the reflections seen in the camera images.

AB - Improved localization of emission and reduction of artefacts have been achieved in tomographic reconstructions of the tangentially viewing spectroscopic divertor cameras in JET by introducing the contribution of reflections from the metallic wall surfaces in the geometry definition of the tomography process. The reconstructions thus describe the plasma emission only without features arising from misinterpreted reflected light. Benchmarks with synthetic emission distributions showed accurate reproduction within 10% and 1-2% of the reference emission distributions and camera images, respectively, when the reflection correction was applied. Without the correction, the reconstructed emission was observed to concentrate from the divertor volume towards the wall surfaces together with bright emission artefacts appearing in front of the surfaces to reproduce the reflections seen in the camera images.

KW - Nuclear instruments and methods for hot plasma diagnostics

KW - Plasma diagnostics - high speed photography

KW - Plasma diagnostics - interferometry, spectroscopy and imaging

U2 - 10.1088/1748-0221/14/10/C10013

DO - 10.1088/1748-0221/14/10/C10013

M3 - Article

VL - 14

JO - Journal of Instrumentation

JF - Journal of Instrumentation

SN - 1748-0221

M1 - 10013

T2 - European Conference on Plasma Diagnostics

Y2 - 6 May 2019 through 10 May 2019

ER -

Demonstration of improvement in 2D tomographic reconstructions of filtered cameras in the JET ITER-like wall divertor due to corrected interpretation of reflections

Abstract

Keywords

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