PISCES-RF: a liquid-cooled high-power steady-state helicon plasma device

Thakur, Saikat Chakraborty; Simmonds, Michael J.; Caneses, Juan F.; Chang, Fengjen; Hollmann, Eric; Doerner, Russell; Goulding, Richard; Lumsdaine, Arnold; Rapp, Juergen; Tynan, George

doi:10.1088/1361-6595/abef19

PISCES-RF: a liquid-cooled high-power steady-state helicon plasma device

Journal Article · Fri May 21 00:00:00 EDT 2021 · Plasma Sources Science and Technology

DOI:https://doi.org/10.1088/1361-6595/abef19· OSTI ID:1824968

^[1]; ^[1]; ^[2]; ^[1]; Hollmann, Eric ^[1]; Doerner, Russell ^[1]; ^[2]; ^[2]; ^[2]; Tynan, George ^[1]

Univ. of San Diego, San Diego, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Radio-frequency (RF) driven helicon plasma sources can produce relatively high-density plasmas (n > 1019 m^-3) at relatively moderate powers (<2 kW) in argon. However, to produce similar high-density plasmas for fusion relevant gases such as hydrogen (H), deuterium (D) and helium (He), much higher RF powers are needed. For very high RF powers, thermal issues of the RF-transparent dielectric window, used in the RF source design, limit the plasma operation timescales. To mitigate this constraint, we have designed, built and tested a novel helicon plasma source assembly with a fully liquid-cooled RF-transparent window which allows steady state operations at high power (up to 20 kW) and successfully produces high-density plasma with both argon and H. Deionized (DI) water, flowing between two concentric dielectric RF windows, is used as the coolant. We show that a full azimuthal blanket of DI water does not prevent high-density plasma production. From calorimetry on the DI water, we measure the net heat removed by the coolant at steady state conditions. Using infra-red imaging, we calculate the constant plasma heat deposition and measure the final steady state temperature distribution patterns on the inner surface of the ceramic layer. The heat deposition pattern follows the helical shape of the antenna. We also show the consistency between the heat absorbed by the DI water, as measured by calorimetry, and the total heat due to the combined effect of the plasma heating and the absorbed RF. These results are being used to answer critical engineering questions for the 200 kW RF device materials plasma exposure experiment being designed at the Oak Ridge National Laboratory as a next generation plasma material interaction device.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1824968

Journal Information:: Plasma Sources Science and Technology, Journal Name: Plasma Sources Science and Technology Journal Issue: 5 Vol. 30; ISSN 0963-0252

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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