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http://arks.princeton.edu/ark:/88435/dsp01bc386n47h
Title: | A reduced-turbulence regime in the Large Helical Device upon injection of low-Z materials powders |
Contributors: | Nespoli, Federico Tanaka, Kenji Masuzaki, Suguru Ashikawa, Naoko Shoji, Mamoru Gilson, Erik Lunsford, Robert Oishi, Tetsutarou Ida, Katsumi Yoshinuma, Mikirou Takemura, Yuki Kinoshita, Toshiki Motojima, Gen Osakabe, Masaki Kenmochi, Naoki Kawamura, Gakushi Suzuki, Chihiro Nagy, Alex Bortolon, Alessandro Pablant, Novimir Mollen, Albert Tamura, Naoki Gates, David Morisaki, Tomohiro U. S. Department of Energy contract number DE-AC02-09CH11466 |
Issue Date: | 19-May-2023 |
Publisher: | Princeton Plasma Physics Laboratory, Princeton University |
Related Publication: | F. Nespoli et al, A reduced-turbulence regime in the Large Helical Device upon injection of low-Z materials powders, 2023 Nuclear Fusion 63 076001 |
Abstract: | Recently an improved confinement regime, characterized by reduced turbulent fluctuations has been observed in the Large Helical Device upon the injection of boron powder into the plasma (Nespoli et al 2022 Nat. Phys.18 350–56). In this article, we report in more detail the experimental observations of increased plasma temperature and the decrease of turbulent fluctuations across the plasma cross section, on an extended database. In particular, we compare powders of different materials (B, C, BN), finding similar temperature improvement and turbulence response for the three cases. Modeling of the powder penetration into the plasma and of neoclassical electric field and fluxes support the interpretation of the experimental results. Additionally, we report evidence of the temperature improvement increasing with powder injection rates and decreasing for both increasing density and heating power. Though, plasma turbulence response varies depending on the initial conditions of the plasma, making it difficult to draw an inclusive description of the phenomenon. |
URI: | http://arks.princeton.edu/ark:/88435/dsp01bc386n47h |
Referenced By: | https://doi.org/10.1088/1741-4326/acd465 |
Appears in Collections: | Stellarators |
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