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08:34
Visualization of High Speed Liquid Jet Impaction on a Moving Surface
Published on: April 17, 2015
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Structure and dynamics of colliding plasma jets.
C K Li1, D D Ryutov2, S X Hu3
1Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Physical Review Letters
|January 31, 2014
Summary
Proton radiographs reveal structures in colliding plasma jets. Magnetic fields are "frozen in" and advected by electron flow, matching analytic models.
Area of Science:
- Plasma physics
- Astrophysical fluid dynamics
- High-energy density physics
Background:
- Laser-generated plasma jets are crucial for understanding astrophysical phenomena.
- Colliding plasma jets exhibit complex structures and dynamics.
Purpose of the Study:
- To investigate the structures and dynamics of colliding plasma jets using monoenergetic-proton radiography.
- To compare experimental observations with 2D hydrodynamic simulations and analytic models.
Main Methods:
- Monoenergetic-proton radiography of laser-generated, high-Mach-number plasma jets.
- 2D hydrodynamic simulations of multistream plasma jets.
- Analytic treatment of electron flow and magnetic field advection.
Main Results:
- Observed flow structures in noncollinear jet collisions align with analytic predictions.
- Spontaneous azimuthal magnetic fields are generated by the Biermann battery effect.
- Magnetic fields are "frozen in" the plasma (Re(M)∼5×10(4)) and advected by electron flow.
Conclusions:
- Proton radiography provides novel insights into colliding plasma jet dynamics.
- The Biermann battery effect and magnetic field advection play significant roles.
- Experimental results validate theoretical and simulation models.
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