Cold bubble formation during tokamak density limit disruptions
نویسندگان
چکیده
منابع مشابه
Cold Bubble Formation during Tokamak Density Limit Disruptions
Tokamak density limit disruptions are studied by tomographically analysing soft X-ray emission data using a modified circular harmonic reconstruction technique. Both minor and major disruptions are associated with the presence of dominant m = l in = 1 and m = 2in = 1 soft X-ray emissivity perturbations leading to the penetration of a cold bubble-like plasma volume to the centre. The role of mod...
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Measurements of the electron temperature, Te , and density, ne , during the energy quench of a major disruption showed that the onset of Te erosion in the neighborhood of the m/n52/1 O point at the low field side ~LFS! accelerates the well-known m/n51/1 erosion of the core temperature. During this phase Te(r) is only partially flat in the region between the q52 and the q51 surfaces and ne(r) de...
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In a tokamak disruption, a substantial fraction of the plasma current can be converted into runaway electrons. Although these are usually highly relativistic, their total energy is initially much smaller than that of the pre-disruption plasma. However, following a suggestion by Putvinski et al. [Plasma Phys. Control. Fusion 39, B157 (1997)], it is shown that as the post-disruption plasma drifts...
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In this work, we discuss the preliminary analysis of some disruptive plasma discharges with a moveable graphite limiter on the HT-7 tokamak, which has been developed in order to investigate the influence of the horizontal plasma position on the density limit. What we have observed is that the m=2, MHD component dominates during almost the whole discharge duration, when the density limit is appr...
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Experimental observations show that there is a magnetic field threshold for runaway electron generation in tokamak disruptions. A possible explanation for these observations is that the runaway beam excites whistler waves that scatter the electrons in velocity space and prevents the beam from growing. The growth rates of the most unstable whistler waves are inversely proportional to the magneti...
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ژورنال
عنوان ژورنال: Nuclear Fusion
سال: 1992
ISSN: 0029-5515
DOI: 10.1088/0029-5515/32/3/i02