Abstract
Blob-like structures are observed in an open magnetic field line configuration of electron cyclotron resonance (ECR) heating plasma in QUEST. The combined measurement with a fast camera and a movable Langmuir probe show that visible filamentary structures extended along field lines do correspond to over-dense plasma structures. Ion saturation current time trace shows a front-like asymmetric burst when a visible structure reaches the probe during its outward propagation. The typical radial velocity of the blob-like structure, Vb, was measured as ∼1km/s with the fast camera at the intermediate area. Vb increased as the blob-like structure moved along major radius, R (outward). The average velocity of E×B drift derived from the probe measurement, slightly larger than Vb, was also increased as the blob-like structure propagated to larger R.
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