Physics – Plasma Physics
Scientific paper
2004-10-22
Physics
Plasma Physics
12th International Congress on Plasma Physics, 25-29 October 2004, Nice (France)
Scientific paper
The control of fluctuations generated in an electron cyclotron resonance (ECR) plasma is attempted by changing microwave powers. It is found that when a cage is introduced in the vacuum chamber, the fluctuations change from turbulent state to chaotic state in the high microwave power region while it changes from chaotic state to periodic state in the low microwave power region. This result suggests that the geometry of the cage affects the state of the instability. Moreover it is found that the superposition of multicusped fields created by small permanent magnets reduces the chaotic dimension of the instability. When pulsed multipole magnetic fields are also added to external magnetic fields, the fluctuations are suppressed.
Fukao Masayuki
Kawai Yoshinobu
Koga Mayuko
Tsuchiya Hayato
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