dorsal/arxiv
View SchemaStatistical features of edge turbulence in RFX-mod from Gas Puffing Imaging
| Authors | F. Sattin, P. Scarin, M. Agostini, R. Cavazzana, G. Serianni, M. Spolaore, N. Vianello |
|---|---|
| Categories | |
| ArXiv ID | physics/0606259 |
| URL | https://arxiv.org/abs/physics/0606259 |
| DOI | 10.1088/0741-3335/48/7/011 |
| Journal | Plasma Physics and Controlled Fusion 48 (2006), p. 1033-1051 |
Abstract
Plasma density fluctuations in the edge plasma of the RFX-mod device are measured through the Gas Puffing Imaging Diagnostics. Statistical features of the signal are quantified in terms of the Probability Distribution Function (PDF), and computed for several kinds of discharges. The PDFs from discharges without particular control methods are found to be adequately described by a Gamma function, consistently with the recent results by Graves et al [J.P. Graves, et al, Plasma Phys. Control. Fusion 47, L1 (2005)]. On the other hand, pulses with external methods for plasma control feature modified PDFs. A first empirical analysis suggests that they may be interpolated through a linear combination of simple functions. An inspection of the literature shows that this kind of PDFs is common to other devices as well, and has been suggested to be due to the simultaneous presence of different mechanisms driving respectively coherent bursts and gaussian background turbulence. An attempt is made to relate differences in the PDFs to plasma conditions such as the local shift of the plasma column. A simple phenomenological model to interpret the nature of the PDF and assign a meaning to its parameters is also developed.
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"abstract": "Plasma density fluctuations in the edge plasma of the RFX-mod device are\nmeasured through the Gas Puffing Imaging Diagnostics. Statistical features of\nthe signal are quantified in terms of the Probability Distribution Function\n(PDF), and computed for several kinds of discharges. The PDFs from discharges\nwithout particular control methods are found to be adequately described by a\nGamma function, consistently with the recent results by Graves et al [J.P.\nGraves, et al, Plasma Phys. Control. Fusion 47, L1 (2005)]. On the other hand,\npulses with external methods for plasma control feature modified PDFs. A first\nempirical analysis suggests that they may be interpolated through a linear\ncombination of simple functions. An inspection of the literature shows that\nthis kind of PDFs is common to other devices as well, and has been suggested to\nbe due to the simultaneous presence of different mechanisms driving\nrespectively coherent bursts and gaussian background turbulence. An attempt is\nmade to relate differences in the PDFs to plasma conditions such as the local\nshift of the plasma column. A simple phenomenological model to interpret the\nnature of the PDF and assign a meaning to its parameters is also developed.",
"arxiv_id": "physics/0606259",
"authors": [
"F. Sattin",
"P. Scarin",
"M. Agostini",
"R. Cavazzana",
"G. Serianni",
"M. Spolaore",
"N. Vianello"
],
"categories": [
"physics.plasm-ph"
],
"doi": "10.1088/0741-3335/48/7/011",
"journal_ref": "Plasma Physics and Controlled Fusion 48 (2006), p. 1033-1051",
"title": "Statistical features of edge turbulence in RFX-mod from Gas Puffing Imaging",
"url": "https://arxiv.org/abs/physics/0606259"
},
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