Investigation of Materials for Radio Frequency Antenna Plasma Facing Components

被引：2

作者：

Caughman, J. B. O. ^{[1
]}

Butler, K. ^{[2
]}

Curreli, D. ^{[3
]}

Donovan, D. ^{[2
]}

Easley, D. C. ^{[2
]}

Gonzalez-Galvan, A. ^{[3
]}

Johnson, C. A. ^{[1
]}

Meredith, L. ^{[3
]}

Unterberg, E. A. ^{[1
]}

机构：

[1] Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA

[2] Univ Tennessee, Dept Nucl Engn, Knoxville, TN 37916 USA

[3] Univ Illinois, Dept Nucl Engn, Urbana, IL 61801 USA

来源：

IEEE TRANSACTIONS ON PLASMA SCIENCE | 2024年 / 52卷 / 09期

关键词：

Optical emission; radio frequency (RF) sheath; sputtering; titanium diboride; tungsten; RESONANCE; ICRF;

D O I：

10.1109/TPS.2024.3374252

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

The interaction of radio frequency (RF) sheaths with fusion reactor relevant materials (e.g., tungsten and titanium diboride) is being studied on the RF Plasma Interaction Experiment (RF PIE). The RF PIE consists of an electron cyclotron resonance (ECR) plasma source (2.45 GHz, 5 kW) with a biased and heated RF electrode that is used to simulate antenna surfaces in contact with the edge plasma. Helium plasmas (density of similar to 1e18/m(3), electron temperature of 4-5 eV) are being used to explore sheath formation on material surfaces with biases up to 500 V. The erosion of a tungsten surface is being studied spectroscopically using a mirror-linked 1 m Czerny-Turner UV imaging spectrometer with a spectral resolution of 0.012 nm for measuring plasma emission in and near the sheath. Tungsten line emission intensity is higher for RF versus dc biasing for similar plasma conditions and average ion energy. RF biasing causes a broadening of the ion energy distribution function (IEDF) due to the RF sheath, as determined from the hPIC2 code, and results in enhanced sputtering. Calculations of the expected sputtering yield for dc and RF biasing are consistent with experimental observations of changes in the 400.9 nm tungsten line emission intensity as a function of ion energy.

引用

页码：4037 / 4042

页数：6

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