Collimated outflows (jets) are ubiquitous in the universe, appearing around sources as diverse as protostars and extragalactic supermassive black holes. Jets are thought to be magnetically collimated, and launched from a magnetized accretion disk surrounding a compact gravitating object. We have developed the first laboratory experiment to address time-dependent, episodic phenomena relevant to the poorly understood jet acceleration and collimation region [1]. The experiments were performed on the MAGPIE pulsed power facility (1.5 MA, 250 ns) at Imperial College. The experimental results show the periodic ejections of magnetic bubbles naturally evolving into a heterogeneous jet propagating inside a channel made of self-collimated magnetic cavities. The results provide a unique view of the possible transition from a relatively steady-state jet launching to the observed highly structured outflows.
Magnetically Driven Supersonic Plasma Jets in High Energy Density Experiments / F., Suzuki Vidal; S. V., Lebedev; A., Ciardi; S. N., Bland; J. P., Chittenden; G. N., Hall; A., Harvey Thomson; Marocchino, Alberto; A., Frank; E. G., Blackman; C., Stehle; M., Camenzind. - ELETTRONICO. - 1242:(2010), pp. 266-275. (Intervento presentato al convegno International Symposium Plasmas in the Laboratory and in the Universe: Interactions, Patterns and Turbulence tenutosi a Como, ITALY nel DEC 01-04, 2009) [10.1063/1.3460134].
Magnetically Driven Supersonic Plasma Jets in High Energy Density Experiments
MAROCCHINO, ALBERTO;
2010
Abstract
Collimated outflows (jets) are ubiquitous in the universe, appearing around sources as diverse as protostars and extragalactic supermassive black holes. Jets are thought to be magnetically collimated, and launched from a magnetized accretion disk surrounding a compact gravitating object. We have developed the first laboratory experiment to address time-dependent, episodic phenomena relevant to the poorly understood jet acceleration and collimation region [1]. The experiments were performed on the MAGPIE pulsed power facility (1.5 MA, 250 ns) at Imperial College. The experimental results show the periodic ejections of magnetic bubbles naturally evolving into a heterogeneous jet propagating inside a channel made of self-collimated magnetic cavities. The results provide a unique view of the possible transition from a relatively steady-state jet launching to the observed highly structured outflows.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
