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 GO07: Laboratory Plasma Astrophysics
9:30 AM–12:18 PM,
Tuesday, October 18, 2022
Room: 401 ABC
Chair: Sergey Lebedev, Imperial College London
Abstract: GO07.00014 : Increasing Angular Momentum in Pulsed-Power Driven quasi-Keplerian Rotating Plasma Experiments*
12:06 PM–12:18 PM
Presenter:
Vicente Valenzuela-Villaseca
(Imperial College London)
Authors:
Vicente Valenzuela-Villaseca
(Imperial College London)
Lee G Suttle
(Imperial College London)
Francisco Suzuki-Vidal
(Imperial College London)
Stefano Merlini
(Imperial College London)
S. Reza Mirfayzi
(Imperial College London)
Jack W Halliday
(Imperial College London)
Danny R Russell
(Imperial College London)
Jeremy P Chittenden
(Imperial College London)
Jack D Hare
(MIT PSFC)
Mark E Koepke
(West Virginia University)
Eric G Blackman
(University of Rochester)
Sergey V Lebedev
(Imperial College London)
Using a simplified model and scaling laws, we show that the initial angular momentum can be greatly increased by selecting the appropriate wire array radius. Consequently, these experiments drive higher rotation velocities, resulting in a detailed characterization of the angular frequency and specific angular momentum stratifications.
The data shows that rotating plasmas are 4 mm diameter and have a hollow density structure. In addition, a hollow-density, rotating axial jet is launched from the experiment. The 3 velocity components of this jet (radial, azimuthal and axial) are measured simultaneously using a Thomson Scattering system with three independent directions of observation. The axial jet rotates at a maximum velocity of ∼40 km/s and has an axial velocity of ∼100 km/s. In the low-density core Ti = Te ∼ 40 eV, whereas on the edges there is an ion temperature increase up to Ti ∼ 100 eV. Finally, we show the plasma flows in this configuration are quasi-Keplerian, demonstrating that RPX is a robust platform to drive astrophysically relevant rotating plasmas.
[1] M. Bocchi, et al., ApJ 767, 84 (2013)
[2] V. Valenzuela-Villaseca, et al., arXiv:2201.10339 (2022)
*This work was supported by the U.S. Department of Energy (DOE) under Award Nos. DE-SC0020434 and DE-NA0003764. Vicente Valenzuela-Villaseca is funded by the Imperial College President’s PhD Scholarships.
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