Construction of a multidipole cylindrical chamber, MAXIMUS, with magnetic X-point configuration and investigation of its plasma properties

We have constructed a low temperature DC plasma source with a cylindrical (60cm radial and 200cm axial) multidipole chamber, `MAgnetic X-point sIMUlator System (MAXIMUS)', whose base pressure is \textasciitilde 10$^{\mathrm{-6}}$ Torr. DC plasmas are generated by a number of hot tungsten filaments which can be biased up to -200 V with respect to the grounded chamber. By applying approximately 50A of current to the filaments, we obtain plasma density of the order of 10$^{\mathrm{9}}$ cm$^{\mathrm{-3}}$ with the electron temperature of \textasciitilde 1 eV measured by a single Langmuir probe. A set of axial copper tube through the chamber creates an axially homogeneous magnetic X-point. This configuration allows us to investigate effects of X-point to the surrounding plasmas. In this work, we present basic properties of plasmas in MAXIMUS and how we can control them.