Design and Analysis of an Actively Cooled Window for a High-Power Helicon Plasma Source

Arnold Lumsdaine; Steve Meitner; Richard Goulding; Juan Caneses; Dean McGinnis; Juergen Rapp; John Burnett

doi:10.1109/TPS.2018.2859388

Design and Analysis of an Actively Cooled Window for a High-Power Helicon Plasma Source

Arnold Lumsdaine, Steve Meitner, Richard Goulding, Juan Caneses, Dean McGinnis, Juergen Rapp, John Burnett

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

8 Scopus citations

Abstract

The material's plasma exposure experiment (MPEX) is a steady-state, linear plasma facility proposed to provide plasma conditions that simulate the first wall and divertor of the next-step fusion devices. MPEX will use an actively cooled, high-power helicon antenna as a plasma source. The antenna is located outside of the vacuum region, and during operation, a significant percentage of the antenna power is deposited on the plasma facing surface of the antenna window. The window thus must be actively cooled so that thermal stresses do not become excessive. The design presented includes two cylindrical windows with an annular water passage in-between in order to allow active cooling. A ceramic-to-metal seal is proposed in order to produce a water-to-vacuum seal that will not outgas and produce impurities. Experimental results from an uncooled window on a short-pulse prototype experiment are modeled using finite-element (FE) results in order to correlate with the heat flux profile. The design of the actively cooled window assembly is presented with computational fluid dynamics and FE analyses to confirm that the hardware can function with a 200-kW antenna within performance limits.

Original language	English
Article number	8432471
Pages (from-to)	902-909
Number of pages	8
Journal	IEEE Transactions on Plasma Science
Volume	47
Issue number	1
DOIs	https://doi.org/10.1109/TPS.2018.2859388
State	Published - Jan 2019

Funding

This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy.

Funders	Funder number
U.S. Department of Energy

Keywords

Linear plasma facilities
materials testing
plasma generation
plasma-material interaction (PMI)

UN SDGs

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

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10.1109/TPS.2018.2859388

Cite this

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title = "Design and Analysis of an Actively Cooled Window for a High-Power Helicon Plasma Source",

abstract = "The material's plasma exposure experiment (MPEX) is a steady-state, linear plasma facility proposed to provide plasma conditions that simulate the first wall and divertor of the next-step fusion devices. MPEX will use an actively cooled, high-power helicon antenna as a plasma source. The antenna is located outside of the vacuum region, and during operation, a significant percentage of the antenna power is deposited on the plasma facing surface of the antenna window. The window thus must be actively cooled so that thermal stresses do not become excessive. The design presented includes two cylindrical windows with an annular water passage in-between in order to allow active cooling. A ceramic-to-metal seal is proposed in order to produce a water-to-vacuum seal that will not outgas and produce impurities. Experimental results from an uncooled window on a short-pulse prototype experiment are modeled using finite-element (FE) results in order to correlate with the heat flux profile. The design of the actively cooled window assembly is presented with computational fluid dynamics and FE analyses to confirm that the hardware can function with a 200-kW antenna within performance limits.",

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AU - Caneses, Juan

AU - McGinnis, Dean

AU - Rapp, Juergen

AU - Burnett, John

PY - 2019/1

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AB - The material's plasma exposure experiment (MPEX) is a steady-state, linear plasma facility proposed to provide plasma conditions that simulate the first wall and divertor of the next-step fusion devices. MPEX will use an actively cooled, high-power helicon antenna as a plasma source. The antenna is located outside of the vacuum region, and during operation, a significant percentage of the antenna power is deposited on the plasma facing surface of the antenna window. The window thus must be actively cooled so that thermal stresses do not become excessive. The design presented includes two cylindrical windows with an annular water passage in-between in order to allow active cooling. A ceramic-to-metal seal is proposed in order to produce a water-to-vacuum seal that will not outgas and produce impurities. Experimental results from an uncooled window on a short-pulse prototype experiment are modeled using finite-element (FE) results in order to correlate with the heat flux profile. The design of the actively cooled window assembly is presented with computational fluid dynamics and FE analyses to confirm that the hardware can function with a 200-kW antenna within performance limits.

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Design and Analysis of an Actively Cooled Window for a High-Power Helicon Plasma Source

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Keywords

UN SDGs

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