Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session BO03: Stellarators and Helical Systems: W7-X, LHD, HSX, CTH, and Others
9:30 AM–12:18 PM,
Monday, October 17, 2022
Room: Ballroom 100 C
Chair: Andrew Ware, University of Montana
Abstract: BO03.00002 : A reduced-turbulence regime in the Large Helical Device upon injection of low-Z materials powders*
9:42 AM–9:54 AM
Presenter:
Federico Nespoli
(Princeton Plasma Physics Laboratory)
Authors:
Federico Nespoli
(Princeton Plasma Physics Laboratory)
Kenji Tanaka
(National Institute for Fusion Science, 322-6 Oroshi-cho Toki, Gifu 509-5292, Japan)
Suguru Masuzaki
(National Institute for Fusion Science, 322-6 Oroshi-cho Toki, Gifu 509-5292, Japan)
Naoko Ashikawa
(National Institute for Fusion Science, 322-6 Oroshi-cho Toki, Gifu 509-5292, Japan)
Mamoru Shoji
(National Institute for Fusion Science, 322-6 Oroshi-cho Toki, Gifu 509-5292, Japan)
Erik P Gilson
(Princeton Plasma Physics Laboratory)
Robert A Lunsford
(Princeton Plasma Physics Laboratory)
Tetsutaro Oishi
(National Institute for Fusion Science, 322-6 Oroshi-cho Toki, Gifu 509-5292, Japan)
Katsumi Ida
(National Institute for Fusion Science, 322-6 Oroshi-cho Toki, Gifu 509-5292, Japan)
Mikiro Yoshinuma
(National Institute for Fusion Science, 322-6 Oroshi-cho Toki, Gifu 509-5292, Japan)
Yuki Takemura
(National Institute for Fusion Science, 322-6 Oroshi-cho Toki, Gifu 509-5292, Japan)
Toshiki Kinoshita
(Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka, 816-8580, Japan)
Gen Motojima
(National Institute for Fusion Science, 322-6 Oroshi-cho Toki, Gifu 509-5292, Japan)
Masaki Osakabe
(National Institute for Fusion Science, 322-6 Oroshi-cho Toki, Gifu 509-5292, Japan)
Naoki Kenmochi
(National Institute for Fusion Science, 322-6 Oroshi-cho Toki, Gifu 509-5292, Japan)
Gakushi Kawamura
(National Institute for Fusion Science, 322-6 Oroshi-cho Toki, Gifu 509-5292, Japan)
Chihiro Suzuki
(National Institute for Fusion Science, 322-6 Oroshi-cho Toki, Gifu 509-5292, Japan)
Alexander Nagy
(Princeton Plasma Physics Laboratory)
Alessandro Bortolon
(Princeton Plasma Physics Laboratory)
Novimir A Pablant
(Princeton Plasma Physics Laboratory)
Albert V Mollen
(Princeton Plasma Physics Laboratory)
Naoki Tamura
(Natl Inst Fusion Science-Toki)
David A Gates
(Princeton Plasma Physics Laboratory)
Tomohiro Morisaki
(National Institute for Fusion Science, 322-6 Oroshi-cho Toki, Gifu 509-5292, Japan)
Collaboration:
LHD experimental team
Here, we report further experimental observations of increased plasma temperature and decreased turbulence on an extended database featuring different heating levels and sources, plasma densities and powder materials: boron, carbon, boron nitride.
As a general trend, the ion temperature improvement increases with powder injection rates and decreases with increasing density, while the dependence on the input power is weak. For the same plasma conditions, different powder materials (B, C, BN) produce similar turbulence response and temperature improvement. Modeling of powder trajectories shows similar penetration of B and C in the main plasma, while 1/3 of the smaller BN grains evaporates in the divertor leg. The improvement with C powder suggests wall conditioning might play a secondary role in accessing this regime, most probably due to suppression of ITG turbulence driven by plasma profiles modification and increase of plasma effective charge.
*This work was conducted within the framework of the NIFS/PPPL International Collaboration, and it is supported by the U.S. DOE under Contract No. DE-AC02-09CH11466 with Princeton University.
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