**Acknowledgement**

First and foremost, I would like to thank Professor Nobbuhoro HARADA for introducing me to the world of plasmasdynamics. I also would like to thank Associate Professor Takashi Kikuchi and Assistant Professor Toru Sasaki for their generous guidance with worthy advices carrying out this work. I sincerely thank Maeda, Kubo, Kawaii and other colleagues from Plasmadaynamics Lab. for assisting me in experiments and helping me improve my work with their invaluable suggestions.
