Aligned Chains within the PK-4 Environment*

Complex plasmas have proven a versatile analog for the study of soft matter systems. On Earth, the streaming ion flow plays a major role in such systems, particularly in interparticle interactions and particle alignment. Since it is in general much weaker than other system forces, in terrestrial experiments its effects are partially masked by gravity obscuring the underlying physics. One way of avoiding this issue is through use of the PK-4 currently in operation on the International Space Station. [1]

This talk will discuss extended particle chain formation as observed in Campaigns 1 through 4 by the PK-4. Experimental observations will be compared to plasma discharge simulations as well as dust charging and interaction simulations.  Data for the dust-dust and dust-plasma interaction will also be compared and the relationship between the phenomenon generally known as striations and dust particle behavior will be examined.

[1] M. Y. Pustylnik, et. al. Review of Scientific Instruments 87 (2016) 093505.