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 BP11: Poster Session I: In-Person, Hall A (9:30-11:00am) and Virtual Poster Presentations (11:15am-12:30pm)
MFE: Analytical,computational; Energetic Particles; Disruptions; Power Handling
ICF: Z-Pinch; MagnetoInertial Fusion; Hydrodynamics; Indirect drive
9:30 AM - 12:30 PM
Monday, October 17, 2022
Room: Exhibit Hall A and Online
Abstract: BP11.00079 : Low-recycling liquid-metal "divertorlets" concept for heat exhaust in divertors of fusion reactors*
Presenter:
Francisco J Saenz
(Princeton University)
Authors:
Francisco J Saenz
(Princeton University)
Zhen Sun
(Princeton Plasma Physics Laboratory)
Brian R Wynne
(Princeton University)
Jabir Al-Salami
(Kyushu University)
Egemen Kolemen
(Princeton University)
The divertorlets concept is a liquid-metal alternative for heat exhaust in divertors that combines advantages of fast and slow flows: (1) reduced MHD drag as it operates in the slow-speed regime and (2) small exposure time of the liquid metal to the plasma [3] to avoid overheating. The divertorlets concept offers continual flow mixing, ensuring a fresh plasma-facing surface of liquid metal, making it compatible with a low hydrogen recycling scenario when operating with liquid lithium. The divertorlets consists of slats that create adjacent vertical channels with direction-alternating flow. A radial electric current is applied to the divertorlets and with a toroidal magnetic field, a Lorentz force (jxB) is produced in the liquid metal, driving the flow around the slats.
Performance of a divertorlets prototype was tested. Agreement between theory, simulations and experiments was attained with |B| < 0.3 T and allowed projections at the reactor scale. Power requirements of a divertorlets system in ITER/DEMO-like reactor are less than 5% of the expected power outputs of such devices. Moreover, heat-exhaust capacities for divertorlets are estimated to improve significantly through the minimization of flow-path length, even above 10 MW/m^2.
[1] E. Kolemen, et al., Nucl. Mater. Energy, 19, 524-530 (2019)
[2] A. Fisher, et al., Nucl. Mater. Energy, 25, 100855 (2020)
[3] F. Saenz, et al., Nucl. Fusion, 62(8), 086008, (2022)
*Supported by US DOE Field Work Proposal No. 1019 (Domestic Liquid Metal Plasma Facing Component Development).
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