The highly magnetized plasma device (ULMAP-FU-I) reported previously, is improved. As a result, the value of the maximum field strength becomes larger and the operation time much longer. Parameters of the plasma placed in new conditions are tabulated and future plans of studies using the device are described briefly.
Some comments and questions are presented to the research works of RF Plug of a Plasma. Most of the published works are experimentally investigated followed by the theories to explain the results. However, it is not clear whther or not the wave of an eigen mode is efficiently excited. Even the wave is excited, another mechanism might be more essential to the confinement. Thus further study will be required.