Abstract:
An apparatus for generating X-ray may include: a plasma chamber; a magnet unit for applying a magnetic field to the plasma chamber, the magnet unit configured to allow the control of the magnitude of the minimum magnetic field in the plasma chamber without change in structure; a microwave generator for applying microwaves to the plasma chamber; a reaction gas injected into the plasma chamber for generating X-ray through electron cyclotron resonance by the magnetic field and the microwaves; a variable guide for focusing the generated X-ray; and a variable extractor for outputting the focused X-ray from the plasma chamber.
Abstract:
This invention relates to a negative active material for a lithium secondary battery, a method of preparing the same and a lithium secondary battery including the same. This negative active material exhibits high capacity and superior cycle-life characteristics and is thus usefully employed in a lithium secondary battery which shows high capacity during high-rate charge · discharge.
Abstract:
An apparatus of an electron cyclotron resonance ion source may include: a magnet unit containing a magnet for generating magnetic fields; an ionizing chamber housing unit for generating ions through electron cyclotron resonance from a plasma; a microwave generating unit for injecting microwaves to the ionizing chamber housing unit to generate ions; and a beam integrating and guiding unit for treating the generated ions. The magnet unit may include: a bobbin for winding the magnet; a variable spacer for dividing the bobbin into a plurality of sections; and the magnet which is wound into the form of a wire or a tape in the plurality of sections formed by the variable spacer.