plasma for producing two-fluid plasma state*

A two-fluid plasma model is one of extended magnetohydrodynamics (MHD) models and widely used for explaining macroscopic plasma phenomena that cannot be explained by the conventional one-fluid MHD. In the two-fluid plasma model, velocity fields of ion and electron (e^-) fluids are determined by corresponding each fluid equation of motion. However, such a two-fluid plasma state has not ever been verified in laboratory experiments. To investigate the two-fluid plasma state experimentally, we have experimented using lithium ion (Li⁺) and e^- fluids. These fluids can be confined not only independently but also simultaneously in the BX-U linear trap. In the BX-U, they are trapped in the corresponding positive and negative potential wells of the BX-U, respectively. In experiments, changes in two-dimensional shape of both Li⁺ and e^- fluids are measured after the elapse of two-fluid plasma state. Currently, we attempt to adjust the diameter of Li⁺ plasmas and the diameter of e^- plasmas by changing each confinement time before the superimposition. In this conference, we will present the method in detail and compare the data obtained by use of it with the previous data.