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WG3: Plasma and laser diagnostics

SImulation og a protostellar jet-wind interaction. Ciardi A. et al, ApJ, 2008.

This group is actively involved in variety research missions in the broad span of activities in the areas of laser matter interactions. The fusion related activities studies of transport in solids/dense plasmas, X-ray and particle beams for studies of plasmas, and laboratory astrophysics.

For example, interaction between a central outflow and surrounding wind is common in astrophysical sources powered by accretion and is of interest for assessing astrophysical jet formation paradigms.

Drawing of the experimental apparatus used for jet launching in the laboratory. The objective is to study the interaction of jets as protostellar outflows, and their interaction with interstellar winds [Ciardi et al.].

Optical and X-ray diagnostics are being used to study the interacting between two nested supersonic plasma flows generated by focusing a long-pulse high-energy laser beam onto a solid target, warm dense matter studies, high energy density studies, etc.

Diagnostics using laser accelerated particle beams

Markus Roth presented at EPSD 2015 an excellent review of recent advances in laser driven ion acceleration and applications. The review includes a broad description of various diagnostics methods based on the prompt proton/neutron particle beams.  The review will be uploaded soon to the website.

Laboratory formation of a scaled protostellar jet , B. Albertazzi et al Science 346, 325 (2014)

Although bipolar jets are seen emerging from a wide variety of astrophysical systems, the issueof their formation and morphology beyond their launching is still under study. Scaled laboratory experiments, representative of young stellar object outflows, reveal that stable and narrow collimation of the entire flow can result from the presence of a poloidal magnetic fieldwhose strength is consistent with observations.

The scaling of electron and positron generation in intense laser-solid interactions

 H. Chen et. al PHYSICS OF PLASMAS 22, 056705 (2015)

 This paper presents experimental scalings of the electrons and positrons produced by intense laser-target interactions at relativistic laser intensities (1018 –1020  W cm2 )The data were acquired from three short-pulse laser facilities with laser energies ranging from 80 to 1500 J.  It was found a non-linear ( EL2 ) scaling of positron yield [Chen et al ., Phys. Rev. Lett. 114 , 215001 (2015)] and a linear scaling of electron yield with the laser energy.



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