Abstract:By using newly installed local helical coils (ULT coils), it is expected that helical magnetic field will be reinforced and then the rotational transform and the cross-sectional area of the last closed flux surface (LCFS) will get larger in TOKASTAR-2. Electron beam mapping and plasma measurement with an electrostatic probe were made to confirm improvement in the helical field. As the result, large closed flux surfaces were measured by using the ULT coils. In plasma measurement, it was observed that the plasma… Show more
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