Feasibility study of a high spatial and time resolution beam emission spectroscopy diagnostic for localized density fluctuation measurements in Lithium Tokamak eXperiment-β (LTX-β)

Santanu Banerjee; D. P. Boyle; A. Maan; R. Majeski; R. Kaita; D. Smith; M. Von Hellermann; C. Hansen; W. Capecchi; D. Elliott

doi:10.1063/5.0101834

Feasibility study of a high spatial and time resolution beam emission spectroscopy diagnostic for localized density fluctuation measurements in Lithium Tokamak eXperiment-β (LTX-β)

Santanu Banerjee, D. P. Boyle, A. Maan, R. Majeski, R. Kaita, D. Smith, M. Von Hellermann, C. Hansen, W. Capecchi, D. Elliott

Diagnostics and Control

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

Abstract

Trapped electron mode (TEM) is the main source of turbulence predicted for the unique operation regime of a flat temperature profile under low-recycling conditions in the LTX-β tokamak, while ion temperature gradient driven turbulence may also occur with gas fueling from the edge. To investigate mainly TEM scale density fluctuations, a high spatial and time resolution 2D beam emission spectroscopy (BES) diagnostic is being developed. Apart from spatially localized density turbulence measurement, BES can provide turbulence flow and flow shear dynamics. This BES system will be realized using an avalanche photodiode-based camera and narrow band interference filter. The system can acquire data at 2 MHz. Simulations with the Simulation of Spectra (SOS) code indicate that a high signal to noise ratio can be achieved with the proposed system. This will enable sampling the density fluctuations at this high time resolution. The design considerations and system optimization using the SOS code are presented.

Original language	English
Article number	113523
Journal	Review of Scientific Instruments
Volume	93
Issue number	11
DOIs	https://doi.org/10.1063/5.0101834
State	Published - Nov 1 2022

Funding

This work was supported by U.S. DOE Award No. DE-AC02-09CH11466. One of the authors (S.B.) would like to thank S. Kubota for many useful discussions on the reflectometry system.

Funders	Funder number
U.S. Department of Energy	DE-AC02-09CH11466

UN SDGs

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

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Banerjee, S., Boyle, D. P., Maan, A., Majeski, R., Kaita, R., Smith, D., Von Hellermann, M., Hansen, C., Capecchi, W., & Elliott, D. (2022). Feasibility study of a high spatial and time resolution beam emission spectroscopy diagnostic for localized density fluctuation measurements in Lithium Tokamak eXperiment-β (LTX-β). Review of Scientific Instruments, 93(11), Article 113523. https://doi.org/10.1063/5.0101834

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title = "Feasibility study of a high spatial and time resolution beam emission spectroscopy diagnostic for localized density fluctuation measurements in Lithium Tokamak eXperiment-β (LTX-β)",

abstract = "Trapped electron mode (TEM) is the main source of turbulence predicted for the unique operation regime of a flat temperature profile under low-recycling conditions in the LTX-β tokamak, while ion temperature gradient driven turbulence may also occur with gas fueling from the edge. To investigate mainly TEM scale density fluctuations, a high spatial and time resolution 2D beam emission spectroscopy (BES) diagnostic is being developed. Apart from spatially localized density turbulence measurement, BES can provide turbulence flow and flow shear dynamics. This BES system will be realized using an avalanche photodiode-based camera and narrow band interference filter. The system can acquire data at 2 MHz. Simulations with the Simulation of Spectra (SOS) code indicate that a high signal to noise ratio can be achieved with the proposed system. This will enable sampling the density fluctuations at this high time resolution. The design considerations and system optimization using the SOS code are presented.",

author = "Santanu Banerjee and Boyle, {D. P.} and A. Maan and R. Majeski and R. Kaita and D. Smith and {Von Hellermann}, M. and C. Hansen and W. Capecchi and D. Elliott",

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Banerjee, S, Boyle, DP, Maan, A, Majeski, R, Kaita, R, Smith, D, Von Hellermann, M, Hansen, C, Capecchi, W & Elliott, D 2022, 'Feasibility study of a high spatial and time resolution beam emission spectroscopy diagnostic for localized density fluctuation measurements in Lithium Tokamak eXperiment-β (LTX-β)', Review of Scientific Instruments, vol. 93, no. 11, 113523. https://doi.org/10.1063/5.0101834

Feasibility study of a high spatial and time resolution beam emission spectroscopy diagnostic for localized density fluctuation measurements in Lithium Tokamak eXperiment-β (LTX-β). / Banerjee, Santanu; Boyle, D. P.; Maan, A. et al.
In: Review of Scientific Instruments, Vol. 93, No. 11, 113523, 01.11.2022.

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

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AU - Banerjee, Santanu

AU - Boyle, D. P.

AU - Maan, A.

AU - Majeski, R.

AU - Kaita, R.

AU - Smith, D.

AU - Von Hellermann, M.

AU - Hansen, C.

AU - Capecchi, W.

AU - Elliott, D.

PY - 2022/11/1

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AB - Trapped electron mode (TEM) is the main source of turbulence predicted for the unique operation regime of a flat temperature profile under low-recycling conditions in the LTX-β tokamak, while ion temperature gradient driven turbulence may also occur with gas fueling from the edge. To investigate mainly TEM scale density fluctuations, a high spatial and time resolution 2D beam emission spectroscopy (BES) diagnostic is being developed. Apart from spatially localized density turbulence measurement, BES can provide turbulence flow and flow shear dynamics. This BES system will be realized using an avalanche photodiode-based camera and narrow band interference filter. The system can acquire data at 2 MHz. Simulations with the Simulation of Spectra (SOS) code indicate that a high signal to noise ratio can be achieved with the proposed system. This will enable sampling the density fluctuations at this high time resolution. The design considerations and system optimization using the SOS code are presented.

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Feasibility study of a high spatial and time resolution beam emission spectroscopy diagnostic for localized density fluctuation measurements in Lithium Tokamak eXperiment-β (LTX-β)

Abstract

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