Physics – Plasma Physics
Scientific paper
Nov 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..dpphp1078y&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
Direct measurements of the formation process of hot, collimated, plasma-filled magnetic flux tubes are presented. The results strongly support a recent MHD model [1] explaining why current-carrying magnetic flux tubes become collimated and dense. This process has not been previously identified in the laboratory because of its rapidity. Here, the process occurs in less than 1 μs and accelerates bulk plasma with 10^10 Earth-g forces to achieve velocities ˜100 km/s. Densities of 10^22 m-3 are achieved in the center column jet [2] that expands in the large vacuum chamber. Fast ion gauge measurements show that the initial neutral gas cloud that is required for breakdown is totally inadequate to account for the measured jet density [3]. Since almost all of the particles are still in the gas feeds, the plasma has to be ingested into the magnetic flux tubes by MHD forces to achieve the observed densities in μs timescales. The evidence for this pumping process helps to explain how astrophysical jets and solar prominences become dense and collimated. [1] Bellan, Phys. Plasmas, 10, 1999-2008 (2003) [2] Hsu & Bellan, Mon. Not. R. Astron. Soc., 334, 2, 257-261 (2002) [3] Yun, Bellan & You, this meeting.
Bellan Paul M.
You Setthivoine
Yun Gunsu
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