Design challenges and analysis of the ITER core LIDAR Thomson scattering system

M. J. Walsh; M. Beurskens; P. G. Carolan; M. Gilbert; M. Loughlin; A. W. Morris; V. Riccardo; Y. Xue; R. B. Huxford; C. I. Walker

doi:10.1063/1.2336473

Design challenges and analysis of the ITER core LIDAR Thomson scattering system

M. J. Walsh, M. Beurskens, P. G. Carolan, M. Gilbert, M. Loughlin, A. W. Morris, V. Riccardo, Y. Xue, R. B. Huxford, C. I. Walker

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

49 Scopus citations

Abstract

The maximum temperature expected in ITER is in the region of 40 keV and the minimum average density of approximately 3× 1019 m-3 is also expected. The proven capability, convenience, and port occupancy of the LIDAR Thomson scattering approach, demonstrated on JET, makes it an excellent candidate for ITER. Nonetheless, there are formidable design challenges in realizing such a diagnostic system. The expected high temperature presents its own problem of a very large relativistic blueshift of the scattered spectrum (e.g., λ λ0 ∼0.35 for Te =40 keV), impacting on the laser choice and spectrometer/detector system. The combination of coupling high power lasers to the plasma and broadband wavelength detection has been examined in terms of minimizing the operational risk to the overall system, while optimizing the diagnostic performance. Part of the exercise has also included identifying the present critical components, and reducing their impact, e.g., on diagnostic reliability and performance, and attempt to make the design compatible with possible long term developments and operational requirement. Issues such as redundancy of key operational components, e.g., lasers are explored.

Original language	English
Article number	10E525
Journal	Review of Scientific Instruments
Volume	77
Issue number	10
DOIs	https://doi.org/10.1063/1.2336473
State	Published - 2006
Externally published	Yes

Funding

This work is funded jointly by the U.K. Engineering and Physical Sciences Research Council and EURATOM, and undertaken as part of an EFDA Task. The authors are indebted to the Culham team and, in particular, to N. H. Balshaw, M. Dunstan, M. J. Forrest, D. Hare, K. Hawkins, M. Kempenaars, P. Parsons, R. Scannell, and G. Razdobarin for their contributions.

Funders	Funder number
H2020 Euratom
Engineering and Physical Sciences Research Council	EP/E034438/1

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1063/1.2336473

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title = "Design challenges and analysis of the ITER core LIDAR Thomson scattering system",

abstract = "The maximum temperature expected in ITER is in the region of 40 keV and the minimum average density of approximately 3× 1019 m-3 is also expected. The proven capability, convenience, and port occupancy of the LIDAR Thomson scattering approach, demonstrated on JET, makes it an excellent candidate for ITER. Nonetheless, there are formidable design challenges in realizing such a diagnostic system. The expected high temperature presents its own problem of a very large relativistic blueshift of the scattered spectrum (e.g., λ λ0 ∼0.35 for Te =40 keV), impacting on the laser choice and spectrometer/detector system. The combination of coupling high power lasers to the plasma and broadband wavelength detection has been examined in terms of minimizing the operational risk to the overall system, while optimizing the diagnostic performance. Part of the exercise has also included identifying the present critical components, and reducing their impact, e.g., on diagnostic reliability and performance, and attempt to make the design compatible with possible long term developments and operational requirement. Issues such as redundancy of key operational components, e.g., lasers are explored.",

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AU - Walsh, M. J.

AU - Beurskens, M.

AU - Carolan, P. G.

AU - Gilbert, M.

AU - Loughlin, M.

AU - Morris, A. W.

AU - Riccardo, V.

AU - Xue, Y.

AU - Huxford, R. B.

AU - Walker, C. I.

PY - 2006

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N2 - The maximum temperature expected in ITER is in the region of 40 keV and the minimum average density of approximately 3× 1019 m-3 is also expected. The proven capability, convenience, and port occupancy of the LIDAR Thomson scattering approach, demonstrated on JET, makes it an excellent candidate for ITER. Nonetheless, there are formidable design challenges in realizing such a diagnostic system. The expected high temperature presents its own problem of a very large relativistic blueshift of the scattered spectrum (e.g., λ λ0 ∼0.35 for Te =40 keV), impacting on the laser choice and spectrometer/detector system. The combination of coupling high power lasers to the plasma and broadband wavelength detection has been examined in terms of minimizing the operational risk to the overall system, while optimizing the diagnostic performance. Part of the exercise has also included identifying the present critical components, and reducing their impact, e.g., on diagnostic reliability and performance, and attempt to make the design compatible with possible long term developments and operational requirement. Issues such as redundancy of key operational components, e.g., lasers are explored.

AB - The maximum temperature expected in ITER is in the region of 40 keV and the minimum average density of approximately 3× 1019 m-3 is also expected. The proven capability, convenience, and port occupancy of the LIDAR Thomson scattering approach, demonstrated on JET, makes it an excellent candidate for ITER. Nonetheless, there are formidable design challenges in realizing such a diagnostic system. The expected high temperature presents its own problem of a very large relativistic blueshift of the scattered spectrum (e.g., λ λ0 ∼0.35 for Te =40 keV), impacting on the laser choice and spectrometer/detector system. The combination of coupling high power lasers to the plasma and broadband wavelength detection has been examined in terms of minimizing the operational risk to the overall system, while optimizing the diagnostic performance. Part of the exercise has also included identifying the present critical components, and reducing their impact, e.g., on diagnostic reliability and performance, and attempt to make the design compatible with possible long term developments and operational requirement. Issues such as redundancy of key operational components, e.g., lasers are explored.

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Design challenges and analysis of the ITER core LIDAR Thomson scattering system

Abstract

Funding

UN SDGs

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