Study of nonlinear behaviors of plasmas

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The objectives of this project are to study (1) nonlinear phenomena in a collisionless plasma such as eddy and chaos, (2) behavior of negative ions and dust plasmas, and (3) behavior of strongly coupled plasmas such as laser produced plasma. Obtained results are as follows:(1) New interaction between eddy and eddy was found by examining complex Gintzburg-Landau equation.(2) Large amplitude waves with large wavelength can excite Buneman instability by up-conversion.(3) Theory of chaos in a Hamiltonian system was developed.(4) Quasiperiodic transition to chaos was observed in ion sheath formed around a mesh grid.(5) Dust particles in SiH4 plasma were measured and the experimental conditions for their occurrence were clarified.(6) Attempt to add C_<60> to Q-machine plasma was made.(7) Potential distribution of RF plasma was measured.(8) Experimental conditions for producing RF ring plasma were examined.(9) Relation between laser produced plasma and Rayleigh-Taylor instability was investigated by numerical simulation.