Other
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsm51b..06l&link_type=abstract
American Geophysical Union, Spring Meeting 2007, abstract #SM51B-06
Other
7831 Laboratory Studies And Experimental Techniques
Scientific paper
The behavior and interaction of magnetic flux ropes has long been a topic of interest to solar and space plasma physicists. (Gekelman, et al. IEEE Trans. Plasma Sci. 20, 614. Furno, et al. Phys. Plasmas 12, 055702.) Very few laboratory experiments have been performed as it is necessary to have a relatively collisionless plasma and currents with significant self-generated fields. Movable lanthanum hexaboride (LaB6) cathodes have been developed to study the 3D dynamics of flux ropes in the Large Plasma Device (LaPD). The background plasma (n ~ 2 × 1012 cm -3, d ~ 60 cm, L ~ 18 m, and τrep= 1 s) is produced with a DC discharge using a pulsed barium oxide-coated cathode. The two or more current channels are created by biasing the LaB6 disks with respect to a grid anode at the opposite end of the chamber. They are emitted parallel to each other and the guide field. J × B forces cause the currents to move across the field and interact. Each 2.5 cm LaB6 disk can produce current densities of 5-10 A/cm2, and can be positioned freely within a transverse plane of the cylindrical LaPD. We plan to make detailed volumetric measurements of the magnetic fields and flows generated by the current channels. Diagnostics include Ḃ, Langmuir, and Mach probes, and laser induced fluorescence. Research is supported by the Department of Energy (grant DE-FG02-03ER54717) and conducted at the Basic Plasma Science Facility at UCLA.
Gekelman Walter
Lawrence E. E.
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