Sanae-I. Itoh


Collapse, Terminating Eventsの物理
日本物理学会 シンポジウム 第52回年会1997.3.29
Physics of Collapse and Terminating Events

Date of publication:

July 1997

Key words:

collapse, terminating events, hysteresis, magnetic trigger, turbulence-turbulence transition


Various catastrophic phenomena, including the sawtooth, ELMs, High-beta collapse, etc., have been known in plasmas. The large scale deformation and transition take place abruptly, characterizing the spatio-temporal evolution of the plasma structure. The collapse phenomena dictate the operational boundary or lead to the termination of the improved confinement states, and are the important subject for the fusion research as well. While the observations on the variety have been accumulated, the understanding on the aspects, that unify the varieties of collapse and terminating events, has also shown progress: Namely, (1)The growth rate of the perturbation, that leads to the collapse, jumps suddenly and has a discontinuity (trigger phenomena), and (2) Noticiable change is not observed in measured parameters until just before the onset, and the abrupt crash happens. Study has been actively advanced, in both the experiment and theory, and the new physics picture has been searched for. Based on the recent research activities and progresses, the symposium was organized on occasion of the annual meeting of the Physical Society of Japan (March 29th, 1997, at Nagoya). Here, the new development of the research, which has been presented at the meeting, is reported. This report would provide a basis for the future focused investigations and breakthrough.

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