AI Article Synopsis
- The study discusses experiments using pulsed-power to create differentially rotating plasmas, mimicking conditions found in astrophysical disks and jets.
- Angular momentum is introduced through ablation flows from a wire array, rather than boundary forces, leading to a plasma jet that rotates upwards.
- The jet exhibits subsonic rotation with a velocity of around 23 km/s and shows a quasi-Keplerian velocity profile, completing up to two rotations in about 150 nanoseconds.
Article Abstract
We present results from pulsed-power driven differentially rotating plasma experiments designed to simulate physics relevant to astrophysical disks and jets. In these experiments, angular momentum is injected by the ram pressure of the ablation flows from a wire array Z pinch. In contrast to previous liquid metal and plasma experiments, rotation is not driven by boundary forces. Axial pressure gradients launch a rotating plasma jet upward, which is confined by a combination of ram, thermal, and magnetic pressure of a surrounding plasma halo. The jet has subsonic rotation, with a maximum rotation velocity 23±3 km/s. The rotational velocity profile is quasi-Keplerian with a positive Rayleigh discriminant κ^{2}∝r^{-2.8±0.8} rad^{2}/s^{2}. The plasma completes 0.5-2 full rotations in the experimental time frame (∼150 ns).
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| http://dx.doi.org/10.1103/PhysRevLett.130.195101 | DOI Listing |
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