2006
DOI: 10.1063/1.2355668
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Abstract: High-speed high-spatial-resolution data obtained by the gas puff imaging (GPI) diagnostic on the National Spherical Torus Experiment [M. Ono, M.G. Bell, R.E. Bell et al. Plasma Phys. Control. Fusion 45, A335 (2003).] is analyzed and interpreted in light of recent theoretical models for electrostatic edge turbulence and blob propagation. The experiment is described in terms of theoretical regimes that predict different dependencies for the radial velocity of blob convection. Using the GPI data, atomic physics a… Show more

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Cited by 131 publications
(152 citation statements)
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“…27 Thus, the observed dynamics may shed light on the blob ejection mechanism in tokamaks, where there are strong indications that blobs result from interchange instabilities in the SOL. 18 In tokamak geometry, a link between a local increase of the radial pressure gradient and the blob formation has recently been predicted for the edge region. 30 Several experiments may now be envisaged in the TOR-PEX device to further investigate the physics of blobs.…”
Section: Discussionmentioning
confidence: 99%
See 1 more Smart Citation
“…27 Thus, the observed dynamics may shed light on the blob ejection mechanism in tokamaks, where there are strong indications that blobs result from interchange instabilities in the SOL. 18 In tokamak geometry, a link between a local increase of the radial pressure gradient and the blob formation has recently been predicted for the edge region. 30 Several experiments may now be envisaged in the TOR-PEX device to further investigate the physics of blobs.…”
Section: Discussionmentioning
confidence: 99%
“…15 Data from gas puff imaging systems 16,17 have provided indirect evidence that blobs are generated in the vicinity of the last closed flux surface of tokamak plasmas, presumably as a result of interchange instability, and are associated with relaxations of the edge pressure profile. 18 From the experimental point of view, the investigation of the generation mechanism in fusion devices is hampered by the intrinsic difficulty to have diagnostic access in the region of interest with adequate temporal and spatial resolution. To overcome these limitations, a number of investigations of blob physics have recently been undertaken in basic plasma physics devices, [6][7][8] in which full diagnostics access with adequate spatial and temporal resolution can be obtained.…”
Section: Introductionmentioning
confidence: 99%
“…The turbulent objects obtained in this way are much more complicated and irregular than the idealized objects treated analytically in the blob model. Nevertheless, as noted above, blob formation and subsequent radial transport is routinely seen in experiments 18,19,21,125,130,134,135,202 and in turbulence simulations that allow full profile modification. 40,41,50,55,59,62 The scaling of the blob radial velocity with blob size and other parameters depends on the current path through the blob (Sec.…”
Section: E Statistical Evidence For Blobs and Holesmentioning
confidence: 99%
“…Plasmas 18, 060501 (2011) showed individual blob velocities which were sometimes inward, 134 while a later analysis (with a more restrictive definition of a blob) showed only outward radial velocities. 135 A discussion of the comparison of some of these results with theory and simulation is given in Secs. IV and V. The variation of blob parameters with plasma density and current for DIII-D is shown in Fig.…”
Section: -15mentioning
confidence: 99%
“…The edge region of tokamak plasmas is replete with density fluctuations and turbulent structures such as blobs [1][2][3]. Radio frequency (RF) waves, commonly used for heating and for current profile control, have to propagate from the excitation structures to the core of the plasma through this active region.…”
Section: Introductionmentioning
confidence: 99%