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• W638325991 abstract "It is known from 60s [1] that micron-sized dust particles with hypervelocities (of the order of 10 km/s) can have sufficient energy for impact ionization when colliding with solid surfaces. Dust detectors based on this phenomenon are widely employed in space research nowadays (see e.g. [2]). In tokamaks, the dust particles can be accelerated to such velocities due to different mechanisms. The ion drag can accelerate the dust up to ion flow velocities, which are typically of the order of tens of km/s for toroidal plasma flow near the last closed magnetic surface (LCMS). The acceleration could be even faster if resonant ion drag occurs [3] or if rocket force is taken into account [4]. Recently a new mechanism of dust acceleration based on stochastic heating was proposed [5]. If such fast particles exist in the scrape-off layer (SOL), dust impact ionization could be used as a diagnostic [6]. Here we briefly summarize evidence of dust impact ionization processes in SOL of FTU [7] which is a full metal machine, with a TZM Molybdenum alloy inner toroidal limiter, inconel or TZM poloidal limiter and stainless steel first wall. The experiment is performed in ohmic discharge with current IP = 0.36 MA, line averaged plasma density ne = 4 10 19 m -3 and magnetic field B = 7.1 T. UFOs were detected during several shots of the experimental campaign indicating that the appropriate conditions for dust study were chosen. Measurements of fluctuations of the ion saturation current were carried out by two molybdenum probes in the equatorial plane with poloidal separation of 0.6 cm. The probes were moved radially to scan the last centimeter near the wall. A typical time series recorded by any of equatorial probes exhibits a high frequency turbulent part and a number of large spikes. Results of statistical analysis suggest that the large spikes (events) by the two probes are poorly correlated; the maximum of cross-correlation function is below 0.3, the cross-coherence is less than 0.3 for all frequencies. Fig. 1 presents results of conditionally averaged wave-forms measured by the two probes and shows that with a threshold of 4 rms the signal from the unconditioned probe signal is only a fraction of the big event seen by the conditioned probe. When the threshold is raised to 8 rms, the difference between signals on two probes is about one order of magnitude." @default.
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• W638325991 date "2007-01-01" @default.
• W638325991 modified "2023-10-13" @default.
• W638325991 title "Fast dust particles in tokamak plasmas : Detection and effects" @default.
• W638325991 hasPublicationYear "2007" @default.
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