Parametric study of midplane gas puffing to maximize ICRF power coupling in ITER

W. Zhang; A. Messiaen; W. Helou; V. Bobkov; P. Lamalle; R. Pitts; W. Tierens

doi:10.1088/1741-4326/acb4ad

Parametric study of midplane gas puffing to maximize ICRF power coupling in ITER

W. Zhang, A. Messiaen, W. Helou, V. Bobkov, P. Lamalle, R. Pitts, W. Tierens

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Abstract

Midplane gas puffing close to the ion cyclotron range of frequencies (ICRF) antennae has been demonstrated to be robust in improving ICRF power coupling in current tokamaks. It is also shown in a previous study (Zhang 2019 Nucl. Mater. Energy 19 364-71) that in ITER, midplane gas puffing with a puff rate of ∼4.5 × 10²² electrons s⁻¹ can increase the antenna loading/coupling resistance by about a factor of two. In this paper, a comprehensive parametric study has been carried out to characterize the influence of midplane gas puffing on ICRF power coupling in additional and broader range of parameter scans. The new parameter scans include the gas puff rate, the poloidal location of the gas pipe orifices (GPOs), the separatrix density, the particle perpendicular diffusion coefficient, the radial distance between the plasma and antenna as well as the antenna phasing. The 3D edge plasma fluid and neutral transport code EMC3-EIRENE code has been used to simulate the 3D distributions of plasma density in the presence of gas puffing, which are then used in the antenna code ANTITER II to calculate the antenna coupling. The simulation results indicate that the ITER ICRF local midplane gas injection layout (with the GPOs located on one side of each antenna port) increases the ICRF power coupling significantly in all studied plasma scenarios and antenna parameters. We are hence confident that the chosen layout for the ICRF local gas injection on ITER is appropriate. We are also confident that the ITER local gas injection will allow boosting the ICRF coupling with all studied plasma conditions and antenna phasings.

Original language	English
Article number	036008
Journal	Nuclear Fusion
Volume	63
Issue number	3
DOIs	https://doi.org/10.1088/1741-4326/acb4ad
State	Published - Mar 2023
Externally published	Yes

Funding

This work was supported by the Chinese National magnetic confinement fusion energy development research project under Grant No. 2022YFE03190200, by National Natural Science Foundation of China under Grant No. 12175273, and has been conducted under IO Contracts IO/20/CT/4300002150 and 4300002178 and partially within the auspices of the ITER Scientist Fellow Network. The views and opinions expressed herein do not necessarily reflect those of the ITER Organization

Funders	Funder number
Chinese National magnetic confinement fusion energy development research project	2022YFE03190200
National Natural Science Foundation of China	IO/20/CT/4300002150, 4300002178, 12175273

Keywords

3D simulations
ICRF coupling
ITER
local gas puffing
scrape-off layer

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

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10.1088/1741-4326/acb4ad

Cite this

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title = "Parametric study of midplane gas puffing to maximize ICRF power coupling in ITER",

abstract = "Midplane gas puffing close to the ion cyclotron range of frequencies (ICRF) antennae has been demonstrated to be robust in improving ICRF power coupling in current tokamaks. It is also shown in a previous study (Zhang 2019 Nucl. Mater. Energy 19 364-71) that in ITER, midplane gas puffing with a puff rate of ∼4.5 × 1022 electrons s−1 can increase the antenna loading/coupling resistance by about a factor of two. In this paper, a comprehensive parametric study has been carried out to characterize the influence of midplane gas puffing on ICRF power coupling in additional and broader range of parameter scans. The new parameter scans include the gas puff rate, the poloidal location of the gas pipe orifices (GPOs), the separatrix density, the particle perpendicular diffusion coefficient, the radial distance between the plasma and antenna as well as the antenna phasing. The 3D edge plasma fluid and neutral transport code EMC3-EIRENE code has been used to simulate the 3D distributions of plasma density in the presence of gas puffing, which are then used in the antenna code ANTITER II to calculate the antenna coupling. The simulation results indicate that the ITER ICRF local midplane gas injection layout (with the GPOs located on one side of each antenna port) increases the ICRF power coupling significantly in all studied plasma scenarios and antenna parameters. We are hence confident that the chosen layout for the ICRF local gas injection on ITER is appropriate. We are also confident that the ITER local gas injection will allow boosting the ICRF coupling with all studied plasma conditions and antenna phasings.",

keywords = "3D simulations, ICRF coupling, ITER, local gas puffing, scrape-off layer",

author = "W. Zhang and A. Messiaen and W. Helou and V. Bobkov and P. Lamalle and R. Pitts and W. Tierens",

note = "Publisher Copyright: {\textcopyright} 2023 The Author(s). Published on behalf of IAEA by IOP Publishing Ltd.",

year = "2023",

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doi = "10.1088/1741-4326/acb4ad",

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AU - Zhang, W.

AU - Messiaen, A.

AU - Helou, W.

AU - Bobkov, V.

AU - Lamalle, P.

AU - Pitts, R.

AU - Tierens, W.

PY - 2023/3

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N2 - Midplane gas puffing close to the ion cyclotron range of frequencies (ICRF) antennae has been demonstrated to be robust in improving ICRF power coupling in current tokamaks. It is also shown in a previous study (Zhang 2019 Nucl. Mater. Energy 19 364-71) that in ITER, midplane gas puffing with a puff rate of ∼4.5 × 1022 electrons s−1 can increase the antenna loading/coupling resistance by about a factor of two. In this paper, a comprehensive parametric study has been carried out to characterize the influence of midplane gas puffing on ICRF power coupling in additional and broader range of parameter scans. The new parameter scans include the gas puff rate, the poloidal location of the gas pipe orifices (GPOs), the separatrix density, the particle perpendicular diffusion coefficient, the radial distance between the plasma and antenna as well as the antenna phasing. The 3D edge plasma fluid and neutral transport code EMC3-EIRENE code has been used to simulate the 3D distributions of plasma density in the presence of gas puffing, which are then used in the antenna code ANTITER II to calculate the antenna coupling. The simulation results indicate that the ITER ICRF local midplane gas injection layout (with the GPOs located on one side of each antenna port) increases the ICRF power coupling significantly in all studied plasma scenarios and antenna parameters. We are hence confident that the chosen layout for the ICRF local gas injection on ITER is appropriate. We are also confident that the ITER local gas injection will allow boosting the ICRF coupling with all studied plasma conditions and antenna phasings.

AB - Midplane gas puffing close to the ion cyclotron range of frequencies (ICRF) antennae has been demonstrated to be robust in improving ICRF power coupling in current tokamaks. It is also shown in a previous study (Zhang 2019 Nucl. Mater. Energy 19 364-71) that in ITER, midplane gas puffing with a puff rate of ∼4.5 × 1022 electrons s−1 can increase the antenna loading/coupling resistance by about a factor of two. In this paper, a comprehensive parametric study has been carried out to characterize the influence of midplane gas puffing on ICRF power coupling in additional and broader range of parameter scans. The new parameter scans include the gas puff rate, the poloidal location of the gas pipe orifices (GPOs), the separatrix density, the particle perpendicular diffusion coefficient, the radial distance between the plasma and antenna as well as the antenna phasing. The 3D edge plasma fluid and neutral transport code EMC3-EIRENE code has been used to simulate the 3D distributions of plasma density in the presence of gas puffing, which are then used in the antenna code ANTITER II to calculate the antenna coupling. The simulation results indicate that the ITER ICRF local midplane gas injection layout (with the GPOs located on one side of each antenna port) increases the ICRF power coupling significantly in all studied plasma scenarios and antenna parameters. We are hence confident that the chosen layout for the ICRF local gas injection on ITER is appropriate. We are also confident that the ITER local gas injection will allow boosting the ICRF coupling with all studied plasma conditions and antenna phasings.

KW - 3D simulations

KW - ICRF coupling

KW - ITER

KW - local gas puffing

KW - scrape-off layer

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ER -

Parametric study of midplane gas puffing to maximize ICRF power coupling in ITER

Abstract

Funding

Keywords

UN SDGs

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