The BX-U linear trap applied to test two-fluid plasma effect by using lithium and electron fluids*

The BX-U linear trap, a modified version of the Penning–Malmberg trap was developed wherein both positive and negative harmonic potential wells were created by using multi-ring electrodes (H. Himura, Nucl. Inst. Methods Phys. Res., Sect. A, {\bf 811}, 100 (2016).). In the machine, pure lithium and electron plasmas are not only produced independently but also trapped simultaneously. Confinement properties of those non-neutral plasmas were investigated recently (S. Kawai, H. Himura {\it et al.}, Phys. Plasmas {\bf 23}, 022113 (2016).) Data were obtained by a micro-channel plate followed by a phosphor screen (H. Himura {\it et al.}, Rev. Sci. Instrum. {\bf 87}, 063306 (2016); S. Yamada and H. Himura, Rev. Sci. Instrum. {\bf 87}, 036109 (2016).). In this meeting, we present our recent results along with detailed description of the BX-U. Also, we explain our method of testing two-fluid effects by using the pure lithium and electron plasmas.