A high-field side scrape-off layer reflectometer on DIII-D for LHCD coupling studies

Evan Leppink; Cornwall Lau; Yijun Lin; Stephen J. Wukitch

doi:10.1063/5.0162739

A high-field side scrape-off layer reflectometer on DIII-D for LHCD coupling studies

Evan Leppink, Cornwall Lau, Yijun Lin, Stephen J. Wukitch

Diagnostics and Control

Research output: Contribution to journal › Conference article › peer-review

Abstract

A high-field side (HFS) scrape-off layer (SOL) reflectometer has been designed and installed on the DIII-D tokamak. The reflectometer measures the HFS SOL density profile with high spatial and temporal resolution, and was installed in support of the upcoming HFS lower hybrid current drive (LHCD) experiment on DIII-D. SOL conditions local to the LHCD launcher are known to play an important role in the wave coupling from the antenna into the plasma core. The HFS SOL reflectometer will help inform LHCD operation and study the parasitic LH-SOL interactions that can affect current drive efficiency. The reflectometer operates in the O-Mode polarization in the 6-27 GHz range, corresponding to a measured 1D density profile at the HFS mid-plane from 4 × 1017 - 9 × 1018 m-3 with frequency sweep times between 20 μs - 200 μs and radial resolution on the order of a few millimeters. This manuscript outlines the design of the reflectometer, data analysis methods, and the first experimental results.

Original language	English
Article number	090007
Journal	AIP Conference Proceedings
Volume	2984
Issue number	1
DOIs	https://doi.org/10.1063/5.0162739
State	Published - Aug 18 2023
Event	24th Topical Conference on Radio-frequency Power in Plasmas - Annapolis, United States Duration: Sep 26 2022 → Sep 28 2022

Funding

Acknowledgment: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences, using the DIII-D National Fusion Facility, a DOE Office of Science user facility, under Award(s) DE-FC02-04ER54698, DE-SC0014264, and DE-FC02-01ER54648.

Funders	Funder number
U.S. Department of Energy
Office of Science	DE-FC02-04ER54698, DE-FC02-01ER54648, DE-SC0014264
Fusion Energy Sciences

UN SDGs

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

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title = "A high-field side scrape-off layer reflectometer on DIII-D for LHCD coupling studies",

abstract = "A high-field side (HFS) scrape-off layer (SOL) reflectometer has been designed and installed on the DIII-D tokamak. The reflectometer measures the HFS SOL density profile with high spatial and temporal resolution, and was installed in support of the upcoming HFS lower hybrid current drive (LHCD) experiment on DIII-D. SOL conditions local to the LHCD launcher are known to play an important role in the wave coupling from the antenna into the plasma core. The HFS SOL reflectometer will help inform LHCD operation and study the parasitic LH-SOL interactions that can affect current drive efficiency. The reflectometer operates in the O-Mode polarization in the 6-27 GHz range, corresponding to a measured 1D density profile at the HFS mid-plane from 4 × 1017 - 9 × 1018 m-3 with frequency sweep times between 20 μs - 200 μs and radial resolution on the order of a few millimeters. This manuscript outlines the design of the reflectometer, data analysis methods, and the first experimental results.",

author = "Evan Leppink and Cornwall Lau and Yijun Lin and Wukitch, {Stephen J.}",

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AU - Lau, Cornwall

AU - Lin, Yijun

AU - Wukitch, Stephen J.

PY - 2023/8/18

Y1 - 2023/8/18

N2 - A high-field side (HFS) scrape-off layer (SOL) reflectometer has been designed and installed on the DIII-D tokamak. The reflectometer measures the HFS SOL density profile with high spatial and temporal resolution, and was installed in support of the upcoming HFS lower hybrid current drive (LHCD) experiment on DIII-D. SOL conditions local to the LHCD launcher are known to play an important role in the wave coupling from the antenna into the plasma core. The HFS SOL reflectometer will help inform LHCD operation and study the parasitic LH-SOL interactions that can affect current drive efficiency. The reflectometer operates in the O-Mode polarization in the 6-27 GHz range, corresponding to a measured 1D density profile at the HFS mid-plane from 4 × 1017 - 9 × 1018 m-3 with frequency sweep times between 20 μs - 200 μs and radial resolution on the order of a few millimeters. This manuscript outlines the design of the reflectometer, data analysis methods, and the first experimental results.

AB - A high-field side (HFS) scrape-off layer (SOL) reflectometer has been designed and installed on the DIII-D tokamak. The reflectometer measures the HFS SOL density profile with high spatial and temporal resolution, and was installed in support of the upcoming HFS lower hybrid current drive (LHCD) experiment on DIII-D. SOL conditions local to the LHCD launcher are known to play an important role in the wave coupling from the antenna into the plasma core. The HFS SOL reflectometer will help inform LHCD operation and study the parasitic LH-SOL interactions that can affect current drive efficiency. The reflectometer operates in the O-Mode polarization in the 6-27 GHz range, corresponding to a measured 1D density profile at the HFS mid-plane from 4 × 1017 - 9 × 1018 m-3 with frequency sweep times between 20 μs - 200 μs and radial resolution on the order of a few millimeters. This manuscript outlines the design of the reflectometer, data analysis methods, and the first experimental results.

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ER -

A high-field side scrape-off layer reflectometer on DIII-D for LHCD coupling studies

Abstract

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UN SDGs

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