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The effect of ECRH on the stability of the radiation induced m=2 mode and on th...
Francisco José Batista Salzedas; A.A.M. Oomens; F.C. Schuller; RTP TeamThe results of a series of experiments done in RTP which had the purpose to avoid or ameliorate radiative density-limit disruptions, will be reported. Avoidance of disruptions was achieved by stabilizing the m = 2 radiation induced tearing mode (RTM) with electron cyclotron resonance heating (ECRH). Both continuous and modulated power deposition was studied. It was found that stabilization with modulated ECRH i...
Exponentially growing tearing modes in Rijnhuizen Tokamak Project plasmas
Francisco José Batista Salzedas; F.C. Schuller; A.A.M. Oomens; RTP TeamThe local measurement of the island width w, around the resonant surface, allowed a direct test of the extended Rutherford model [P. H. Rutherford, PPPL Report-2277 (1985)], describing the evolution of radiation-induced tearing modes prior to disruptions of tokamak plasmas. It is found that this model accounts very well for the observed exponential growth and supports radiation losses as being the main driving ...
High Resolution Ne and Te Profiles During the Energy Quench of Density Limit Di...
Francisco José Batista Salzedas; S. Hokin; F. C. Schüller; A. A. M. Oomens; RTP TeamElectron temperature, Te and density, ne profiles were measured during the energy quench of a major density limit disruption in RTP (a=0.164 m, R0=0.72 m, qa=4). The evolution of the Te profile was followed with high temporal resolution (1 us) with a 20 channels ECE radiometer. High spatial (3 mm) Te and ne profiles were measured at different times during the energy quench with a Thomson scattering. With these ...
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