Polarization Stark spectroscopy for spatially resolved measurements of electric fields in the sheaths of ICRF antenna

A. Kostic; K. Crombé; R. Dux; M. Griener; R. Ochoukov; I. Shesterikov; G. Suárez López; M. Usoltceva; R. Casagrande; E. H. Martin; J. M. Noterdaeme

doi:10.1063/1.5123659

Polarization Stark spectroscopy for spatially resolved measurements of electric fields in the sheaths of ICRF antenna

A. Kostic, K. Crombé, R. Dux, M. Griener, R. Ochoukov, I. Shesterikov, G. Suárez López, M. Usoltceva, R. Casagrande, E. H. Martin, J. M. Noterdaeme

Advanced Tokamak Physics

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Abstract

A multichannel spectroscopic diagnostic based on the Stark effect on helium lines was developed and implemented in IShTAR (Ion Cyclotron Sheath Test ARrangement) to measure the spatial distribution of electric fields across the radio frequency sheaths of the ion cyclotron antenna. Direct measurements of the DC electric fields in the antenna sheaths are an important missing component in understanding the antenna-plasma edge interactions in magnetically confined fusion plasmas since they will be used to benchmark theoretical models against real antenna operation. Along with the high-resolution Czerny-Turner monochromator and a detector with an intensifier, the hardware relies on the 2 chained set of linear-to-linear fiber bundles that provide seven optical channels capable of resolving an 8.4 mm region in the vicinity of the antenna's box. The diagnostic is supported with local helium gas puff, enabling it to operate in nonhelium plasmas. Spatially resolved electric field was measured for two discharge configurations, one with and one without the ICRF antenna. The results show a clear difference in the shape of the DC electric field's spatial profile for the two cases studied, with the elevated values when the ICRF antenna was operating. This demonstrates the ability of the diagnostic to measure even small relative changes in the intensity of the electric field.

Original language	English
Article number	123101
Journal	Review of Scientific Instruments
Volume	90
Issue number	12
DOIs	https://doi.org/10.1063/1.5123659
State	Published - Dec 1 2019

Funding

This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014–2018 and 2019–2020 under Grant Agreement No. 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. The work was also supported by the Research Foundation – Flanders (FWO), with Project No. G0B3115N.

Funders	Funder number
Research Foundation – Flanders
Horizon 2020 Framework Programme
H2020 Euratom	633053
Fonds Wetenschappelijk Onderzoek

UN SDGs

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

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Kostic, A., Crombé, K., Dux, R., Griener, M., Ochoukov, R., Shesterikov, I., Suárez López, G., Usoltceva, M., Casagrande, R., Martin, E. H., & Noterdaeme, J. M. (2019). Polarization Stark spectroscopy for spatially resolved measurements of electric fields in the sheaths of ICRF antenna. Review of Scientific Instruments, 90(12), Article 123101. https://doi.org/10.1063/1.5123659

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abstract = "A multichannel spectroscopic diagnostic based on the Stark effect on helium lines was developed and implemented in IShTAR (Ion Cyclotron Sheath Test ARrangement) to measure the spatial distribution of electric fields across the radio frequency sheaths of the ion cyclotron antenna. Direct measurements of the DC electric fields in the antenna sheaths are an important missing component in understanding the antenna-plasma edge interactions in magnetically confined fusion plasmas since they will be used to benchmark theoretical models against real antenna operation. Along with the high-resolution Czerny-Turner monochromator and a detector with an intensifier, the hardware relies on the 2 chained set of linear-to-linear fiber bundles that provide seven optical channels capable of resolving an 8.4 mm region in the vicinity of the antenna's box. The diagnostic is supported with local helium gas puff, enabling it to operate in nonhelium plasmas. Spatially resolved electric field was measured for two discharge configurations, one with and one without the ICRF antenna. The results show a clear difference in the shape of the DC electric field's spatial profile for the two cases studied, with the elevated values when the ICRF antenna was operating. This demonstrates the ability of the diagnostic to measure even small relative changes in the intensity of the electric field.",

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AU - Kostic, A.

AU - Crombé, K.

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AU - Griener, M.

AU - Ochoukov, R.

AU - Shesterikov, I.

AU - Suárez López, G.

AU - Usoltceva, M.

AU - Casagrande, R.

AU - Martin, E. H.

AU - Noterdaeme, J. M.

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N2 - A multichannel spectroscopic diagnostic based on the Stark effect on helium lines was developed and implemented in IShTAR (Ion Cyclotron Sheath Test ARrangement) to measure the spatial distribution of electric fields across the radio frequency sheaths of the ion cyclotron antenna. Direct measurements of the DC electric fields in the antenna sheaths are an important missing component in understanding the antenna-plasma edge interactions in magnetically confined fusion plasmas since they will be used to benchmark theoretical models against real antenna operation. Along with the high-resolution Czerny-Turner monochromator and a detector with an intensifier, the hardware relies on the 2 chained set of linear-to-linear fiber bundles that provide seven optical channels capable of resolving an 8.4 mm region in the vicinity of the antenna's box. The diagnostic is supported with local helium gas puff, enabling it to operate in nonhelium plasmas. Spatially resolved electric field was measured for two discharge configurations, one with and one without the ICRF antenna. The results show a clear difference in the shape of the DC electric field's spatial profile for the two cases studied, with the elevated values when the ICRF antenna was operating. This demonstrates the ability of the diagnostic to measure even small relative changes in the intensity of the electric field.

AB - A multichannel spectroscopic diagnostic based on the Stark effect on helium lines was developed and implemented in IShTAR (Ion Cyclotron Sheath Test ARrangement) to measure the spatial distribution of electric fields across the radio frequency sheaths of the ion cyclotron antenna. Direct measurements of the DC electric fields in the antenna sheaths are an important missing component in understanding the antenna-plasma edge interactions in magnetically confined fusion plasmas since they will be used to benchmark theoretical models against real antenna operation. Along with the high-resolution Czerny-Turner monochromator and a detector with an intensifier, the hardware relies on the 2 chained set of linear-to-linear fiber bundles that provide seven optical channels capable of resolving an 8.4 mm region in the vicinity of the antenna's box. The diagnostic is supported with local helium gas puff, enabling it to operate in nonhelium plasmas. Spatially resolved electric field was measured for two discharge configurations, one with and one without the ICRF antenna. The results show a clear difference in the shape of the DC electric field's spatial profile for the two cases studied, with the elevated values when the ICRF antenna was operating. This demonstrates the ability of the diagnostic to measure even small relative changes in the intensity of the electric field.

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Polarization Stark spectroscopy for spatially resolved measurements of electric fields in the sheaths of ICRF antenna

Abstract

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