Physics – Plasma Physics
Scientific paper
Nov 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..dppem1007y&link_type=abstract
American Physical Society, 46th Annual Meeting of the Division of Plasma Physics, 15-19 November, 2004, Savannah, GA. MEETING I
Physics
Plasma Physics
Scientific paper
Magnetically-driven astrophysical jets are simulated at the laboratory scale in our experiment; this talk presents direct measurements of the formation process of these axially expanding, collimated, plasma-filled magnetic flux tubes. The results strongly support a recent MHD model [1] explaining why current-carrying magnetic flux tubes become collimated and dense. The process occurs in less than 1 μs in our experiment and involves acceleration by MHD forces to achieve flow velocities of the order of ˜100 km/s. Densities of 10^22 m-3 are achieved in the center column ``astrophysical jet'' [2] that expands axially into a large vacuum chamber. Measurements show that the initial neutral gas cloud required for breakdown cannot account for such a large jet density [3], and that plasma is ingested into the magnetic flux tubes on μs time scales by MHD pumping. These observations resolve the sequence of steps leading to the collimation of current-carrying magnetic flux tubes. [1] Bellan P. M., Phys. Plasmas, 10, 1999-2008 (2003) [2] Hsu S. C., Bellan P. M., Mon. Not. R. Astron. Soc., 334, 2, 257-261 (2002) [3] Yun G.-S., Bellan P. M., You S., poster HP1.047, Wed morning
Bellan Paul M.
You Setthivoine
Yun Gunsu S.
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