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Description of complex viewing geometries of fusion tomography diagnostics by ray-tracing

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Description of complex viewing geometries of fusion tomography diagnostics by ray-tracing. / Carr, M.; Meakins, A.; Bernert, M.; David, P.; Giroud, C.; Harrison, J.; Henderson, S.; Lipschultz, B.; Reimold, F.; EUROfusion MST1 Team; ASDEX Upgrade Team.

In: Review of Scientific Instruments, Vol. 89, No. 8, 083506, 16.08.2018.

Research output: Contribution to journalReview article

Harvard

Carr, M, Meakins, A, Bernert, M, David, P, Giroud, C, Harrison, J, Henderson, S, Lipschultz, B, Reimold, F, EUROfusion MST1 Team & ASDEX Upgrade Team 2018, 'Description of complex viewing geometries of fusion tomography diagnostics by ray-tracing', Review of Scientific Instruments, vol. 89, no. 8, 083506. https://doi.org/10.1063/1.5031087

APA

Carr, M., Meakins, A., Bernert, M., David, P., Giroud, C., Harrison, J., ... ASDEX Upgrade Team (2018). Description of complex viewing geometries of fusion tomography diagnostics by ray-tracing. Review of Scientific Instruments, 89(8), [083506]. https://doi.org/10.1063/1.5031087

Vancouver

Carr M, Meakins A, Bernert M, David P, Giroud C, Harrison J et al. Description of complex viewing geometries of fusion tomography diagnostics by ray-tracing. Review of Scientific Instruments. 2018 Aug 16;89(8). 083506. https://doi.org/10.1063/1.5031087

Author

Carr, M. ; Meakins, A. ; Bernert, M. ; David, P. ; Giroud, C. ; Harrison, J. ; Henderson, S. ; Lipschultz, B. ; Reimold, F. ; EUROfusion MST1 Team ; ASDEX Upgrade Team. / Description of complex viewing geometries of fusion tomography diagnostics by ray-tracing. In: Review of Scientific Instruments. 2018 ; Vol. 89, No. 8.

Bibtex - Download

@article{3dfc8afeac454839a96a6ae686412eb8,
title = "Description of complex viewing geometries of fusion tomography diagnostics by ray-tracing",
abstract = "Ray-tracing techniques are applied to bolometry, a diagnostic where the finite collection volume is particularly sensitive to the machine and detector configuration. A technique is presented that can handle arbitrarily complex aperture and collimator geometries, neglecting reflection effects. Sight lines from the ASDEX Upgrade bolometer foils were ray-traced with a path tracing algorithm, where the optical path is represented by a statistical bundle of ray paths connecting the foil surface with the slit geometry. By using the full 3D machine model for the detector box and first wall, effects such as occlusion and vignetting were included in the calculation of the bolometer’s {\'e}tendue. Inversion matrices calculated with the ray-tracing technique were compared with the more conventional single-ray approach and shown to be naturally more constrained, requiring less regularisation. The two models were tested on a sample radiation scenario, and the common single-ray approximation is shown to be insufficient. These results are particularly relevant for the divertor where strong emission gradients may be present. The technique developed generalises well to arbitrarily complex viewing geometries and collimators, opening up a new design space for bolometer configurations that might not normally have been considered.",
author = "M. Carr and A. Meakins and M. Bernert and P. David and C. Giroud and J. Harrison and S. Henderson and B. Lipschultz and F. Reimold and {EUROfusion MST1 Team} and {ASDEX Upgrade Team}",
note = "This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details.",
year = "2018",
month = "8",
day = "16",
doi = "10.1063/1.5031087",
language = "English",
volume = "89",
journal = "J Scientific Instruments",
issn = "0034-6748",
publisher = "American Institute of Physics Publising LLC",
number = "8",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Description of complex viewing geometries of fusion tomography diagnostics by ray-tracing

AU - Carr, M.

AU - Meakins, A.

AU - Bernert, M.

AU - David, P.

AU - Giroud, C.

AU - Harrison, J.

AU - Henderson, S.

AU - Lipschultz, B.

AU - Reimold, F.

AU - EUROfusion MST1 Team

AU - ASDEX Upgrade Team

N1 - This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details.

PY - 2018/8/16

Y1 - 2018/8/16

N2 - Ray-tracing techniques are applied to bolometry, a diagnostic where the finite collection volume is particularly sensitive to the machine and detector configuration. A technique is presented that can handle arbitrarily complex aperture and collimator geometries, neglecting reflection effects. Sight lines from the ASDEX Upgrade bolometer foils were ray-traced with a path tracing algorithm, where the optical path is represented by a statistical bundle of ray paths connecting the foil surface with the slit geometry. By using the full 3D machine model for the detector box and first wall, effects such as occlusion and vignetting were included in the calculation of the bolometer’s étendue. Inversion matrices calculated with the ray-tracing technique were compared with the more conventional single-ray approach and shown to be naturally more constrained, requiring less regularisation. The two models were tested on a sample radiation scenario, and the common single-ray approximation is shown to be insufficient. These results are particularly relevant for the divertor where strong emission gradients may be present. The technique developed generalises well to arbitrarily complex viewing geometries and collimators, opening up a new design space for bolometer configurations that might not normally have been considered.

AB - Ray-tracing techniques are applied to bolometry, a diagnostic where the finite collection volume is particularly sensitive to the machine and detector configuration. A technique is presented that can handle arbitrarily complex aperture and collimator geometries, neglecting reflection effects. Sight lines from the ASDEX Upgrade bolometer foils were ray-traced with a path tracing algorithm, where the optical path is represented by a statistical bundle of ray paths connecting the foil surface with the slit geometry. By using the full 3D machine model for the detector box and first wall, effects such as occlusion and vignetting were included in the calculation of the bolometer’s étendue. Inversion matrices calculated with the ray-tracing technique were compared with the more conventional single-ray approach and shown to be naturally more constrained, requiring less regularisation. The two models were tested on a sample radiation scenario, and the common single-ray approximation is shown to be insufficient. These results are particularly relevant for the divertor where strong emission gradients may be present. The technique developed generalises well to arbitrarily complex viewing geometries and collimators, opening up a new design space for bolometer configurations that might not normally have been considered.

UR - http://www.scopus.com/inward/record.url?scp=85052337714&partnerID=8YFLogxK

U2 - 10.1063/1.5031087

DO - 10.1063/1.5031087

M3 - Review article

VL - 89

JO - J Scientific Instruments

T2 - J Scientific Instruments

JF - J Scientific Instruments

SN - 0034-6748

IS - 8

M1 - 083506

ER -