Intermittent fluctuations in the TCV scrape-off layer

0444291 - ÚFP 2016 RIV AT eng J - Článek v odborném periodiku
Garcia, O.E. - Horáček, Jan - Pitts, R.A.
Intermittent fluctuations in the TCV scrape-off layer.
Nuclear Fusion. Roč. 55, č. 6 (2015), č. článku 062002. ISSN 0029-5515. E-ISSN 1741-4326
Grant CEP: GA ČR(CZ) GAP205/12/2327
Institucionální podpora: RVO:61389021
Klíčová slova: scrape-off layer * fluctuations * turbulence * plasma-wall interactions * tcv * intermittency * transport
Kód oboru RIV: BL - Fyzika plazmatu a výboje v plynech
Impakt faktor: 4.040, rok: 2015
http://iopscience.iop.org/0029-5515/55/6/062002/pdf/0029-5515_55_6_062002.pdf

Probe measurements in the scrape-off layer of tokamak plasmas show that the ion saturation current signal is dominated by large amplitude bursts. Analysis of data time series from tokamak ´a configuration variable of unprecedented duration reveals that both burst amplitudes and waiting times are exponentially distributed. The average burst wave form has an exponential shape with a characteristic time that is independent of the burst amplitude. These results support a novel stochastic model, which suggests that the high particle density in the far scrape-off layer is due to the radial motion of uncorrelated blob-like structures. Predictions of the model describe the broad range of universality of plasma fluctuations in the boundary region of tokamak plasmas.
Trvalý link: http://hdl.handle.net/11104/0246835