TY - JOUR
T1 - Study of blob-like structures in QUEST
AU - Liu, H. Q.
AU - Hanada, K.
AU - Nishino, N.
AU - Ogata, R.
AU - Ishiguro, M.
AU - Zushi, H.
AU - Nakamura, K.
AU - Sakamoto, M.
AU - Idei, H.
AU - Fujisawa, A.
AU - Hasegawa, M.
AU - Higashizono, Y.
AU - Kawasaki, S.
AU - Nakashima, H.
AU - Higashijima, A.
PY - 2011/8/1
Y1 - 2011/8/1
N2 - 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 ∼1 km/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.
AB - 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 ∼1 km/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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U2 - 10.1016/j.jnucmat.2010.12.225
DO - 10.1016/j.jnucmat.2010.12.225
M3 - Article
AN - SCOPUS:80054837894
SN - 0022-3115
VL - 415
SP - S620-S623
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
IS - 1 SUPPL
ER -