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- W1661590079 abstract "Characteristics of a cloud ablated from an ice pellet has been investigated in detail in the JIPP T‐IIU tokamak plasma by utilizing a new scheme of pellet injection system, “the injection‐angle controllable system”. A long “helical tail” of ablation light has been observed using CCD cameras and a high speed framing photograph in the case of on‐axis and off‐axis injection with the injection angle smaller than a certain value. The direction of the helical tail is found to be independent to that of the total magnetic field lines of the torus. From the experiments with the combination of two toroildal filed directions and two plasma current directions, it is considered that the tail seems to rotate, in most cases, to the electron diamagnetic direction poloidally, and to the opposite to the plasma current direction toroidally. Consideration on various cross sections including charge exchange, ionization and elastic collisions leads us to the conclusion that the tail‐shaped phenomena may come from the situation of charge exchange equilibrium of hydrogen ions and neutrals at extremely high density regime in the cloud. The relation of ablation behavior with plasma potential and rotation has also been studied. Potential measurements of pellet‐injected plasmas using heavy ion beam probe (HIBP) method were carried out for the first time. In the case of an injection angle to be anti‐parallel to the electron diamagnetic direction in the poloidal plane, the result shows that the direction of potential change is negative, and consequently the potential after the injection should be negative because it has been measured to be negative in usual ohmic plasmas without pellet injection. Thus, the direction of the “tail” structure seems to be consistent to that of the plasma potential measured, if it is considered that tail structure may be caused by the effect of the plasma potential and the rotation." @default.
- W1661590079 created "2016-06-24" @default.
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- W1661590079 date "2003-01-01" @default.
- W1661590079 modified "2023-09-26" @default.
- W1661590079 title "Investigation on the Characteristics of Pellet Ablation in a Toroidal Plasma" @default.
- W1661590079 doi "https://doi.org/10.1063/1.1593863" @default.
- W1661590079 hasPublicationYear "2003" @default.
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