We present experimental results on the formation of supersonic, radiatively cooled jets driven by pressure due to the toroidal magnetic field generated by the 1.5 MA, 250 ns current from the MAGPIE generator. The morphology of the jet produced in the experiments is relevant to astrophysical jet scenarios in which a jet on the axis of a magnetic cavity is collimated by a toroidal magnetic field as it expands into the ambient medium. The jets in the experiments have similar Mach number, plasma beta and cooling parameter to those in protostellar jets. Additionally the Reynolds, magnetic Reynolds and Peclet numbers are much larger than unity, allowing the experiments to be scaled to astrophysical flows. The experimental configuration allows for the generation of episodic magnetic cavities, suggesting that periodic fluctuations near the source may be responsible for some of the variability observed in astrophysical jets. Preliminary measurements of kinetic, magnetic and Poynting energy of the jets in our experiments are presented and discussed, together with estimates of their temperature and trapped toroidal magnetic field.

Experimental Studies of Magnetically Driven Plasma Jets / F., Suzuki Vidal; S. v., Lebedev; S. n., Bland; G. n., Hall; G., Swadling; A. j., Harvey Thompson; G., Burdiak; P. d., Grouchy; J. p., Chittenden; Marocchino, Alberto; M., Bocchi; A., Ciardi; A., Frank; S. c., Bott. - In: ASTROPHYSICS AND SPACE SCIENCE. - ISSN 0004-640X. - STAMPA. - 336:1(2011), pp. 41-46. [10.1007/s10509-010-0543-3]

Experimental Studies of Magnetically Driven Plasma Jets

MAROCCHINO, ALBERTO;
2011

Abstract

We present experimental results on the formation of supersonic, radiatively cooled jets driven by pressure due to the toroidal magnetic field generated by the 1.5 MA, 250 ns current from the MAGPIE generator. The morphology of the jet produced in the experiments is relevant to astrophysical jet scenarios in which a jet on the axis of a magnetic cavity is collimated by a toroidal magnetic field as it expands into the ambient medium. The jets in the experiments have similar Mach number, plasma beta and cooling parameter to those in protostellar jets. Additionally the Reynolds, magnetic Reynolds and Peclet numbers are much larger than unity, allowing the experiments to be scaled to astrophysical flows. The experimental configuration allows for the generation of episodic magnetic cavities, suggesting that periodic fluctuations near the source may be responsible for some of the variability observed in astrophysical jets. Preliminary measurements of kinetic, magnetic and Poynting energy of the jets in our experiments are presented and discussed, together with estimates of their temperature and trapped toroidal magnetic field.
2011
criteria; jets; laboratory astrophysics; magnetic bubble; magnetic cavity; toroidal magnetic field; z-pinch
01 Pubblicazione su rivista::01a Articolo in rivista
Experimental Studies of Magnetically Driven Plasma Jets / F., Suzuki Vidal; S. v., Lebedev; S. n., Bland; G. n., Hall; G., Swadling; A. j., Harvey Thompson; G., Burdiak; P. d., Grouchy; J. p., Chittenden; Marocchino, Alberto; M., Bocchi; A., Ciardi; A., Frank; S. c., Bott. - In: ASTROPHYSICS AND SPACE SCIENCE. - ISSN 0004-640X. - STAMPA. - 336:1(2011), pp. 41-46. [10.1007/s10509-010-0543-3]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/429249
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