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|Type:||Artigo de periódico|
|Title:||Overview Of Recent Results Of Tcabr|
|Author:||Bellintani Jr. V.|
De Sa W.P.
Da Silva R.P.
|Abstract:||An overview of recent results obtained in TCABR is presented. Experiments on Alfvén wave heating have been carried out in both low and high density regimes. Controlling the density rise usually observed in Alfvén heating experiments, it was possible to get a clear confirmation of electron temperature increase in low-density discharges. In the high density regime, the Alfvén wave absorption occurs at mode numbers quite different from those for low density. Detailed experiments have been carried out on the transition between low and high-density confinement regimes, triggered by electrostatic polarization at the plasma edge. The results indicate that the flatness of the density profile and the decrease of edge recycling depend strongly on the level of MHD activity during transition. A preliminary analysis of the electromagnetic emission associated with the relaxation instability in the new regime of runaway discharges discovered in TCABR shows that the observations are coherent with theoretical models. The heat transport in the presence of large magnetic islands has been investigated, in the collisional regime, and found to be properly described by the Fitzpatrick model. Finally, two diagnostic techniques have been further improved, the determination of the position of the local Alfvén resonance by microwave reflectometry and the determination of the temperature and density at the plasma edge by the method based upon the uniqueness of the particle confinement time, determined from the hydrogen Balmer series emission. © 2006 American Institute of Physics.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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