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 NP11: Poster Session V: In-Person, Hall A (9:30-11:00am) and Virtual Poster Presentations (11:15am-12:30pm)
MFE: Stellerators
HED: High Energy Density
BEAMS: Short Pulse Laser Plasmas
HED: Short Pulse Laser Plasma
SPACE: Space Plasmas
9:30 AM - 12:30 PM
Wednesday, October 19, 2022
Room: Exhibit Hall A and Online
Abstract: NP11.00095 : Radiative Shocks and Instabilities in Colliding Supersonic Plasma Jets*
Presenter:
Stefano Merlini
(Imperial College London)
Authors:
Stefano Merlini
(Imperial College London)
Jack W Halliday
(Imperial College London)
Lee G Suttle
(Imperial College London)
Daniel R Russell
(Imperial College London)
Vicente Valenzuela-Villaseca
(Imperial College London)
Jeremy P Chittenden
(Imperial College London)
Sergey V Lebedev
(Imperial College London)
Here, we present an investigation of radiative shocks and stagnated plasma regions in counter-streaming supersonic plasma flows interacting within an ambient magnetic field. The colliding plasma flows () are generated by the ablation of solid silicon targets driven by a radiation pulse from a wire array Z-Pinch [1] at the MAGPIE Pulsed - Power Generator facility (1.4MA, 240ns rise-time). An ambient magnetic field along the plasma expansion direction is sustained by the current-currying Z – pinch plasma.
Experiments show the formation of a shock at the middle plane of the interaction region and the consequent development to a dense stagnated plasma layer. A combination of Thomson Scattering measurements and laser-probing interferometry were used to measure plasma density, temperature and flow velocity while an optical self-emission camera captured the overall dynamic. In addition, recent progress on the development of the imaging refractometer [3] technique is also discussed as a promising diagnostic to study radiatively cooled plasmas and transition to turbulence.
*This work was supported by the U.S. Department of Energy (DOE) under Award Nos. DE-SC0020434 and DE-NA0003764, and by the U.S. Defense Threat Reduction Agency (DTRA) under Award No. HDTRA1-20-1-0001.
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