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Fusion"],"published-print":{"date-parts":[[2012,6,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>Floating potential structures that are correlated over a long distance are observed with a 2D probe array in the plasma edge of the TJ-II stellarator. We introduce a method based on the singular value decomposition to extract the spatio-temporal structure of the global, fluctuating, zonal-flow(ZF)-like floating potential from the combined measurements of a 2D probe array and a distant single probe. The amplitude of these global structures is seen to modulate not only the high <jats:italic>k<\/jats:italic>\n                  <jats:sub>\u03b8<\/jats:sub> spectral power of the local turbulence but also particle transport into the unconfined scrape-off layer, as observed by <jats:italic>H<\/jats:italic>\n                  <jats:sub>\u03b1<\/jats:sub> monitors around the device. These observations provide the first direct evidence of the global modulation of transport by ZF-like structures. The ability to identify spontaneous and collective rotation events with flux surface symmetry opens up the possibility to perform unperturbative studies of the effective viscosity in stellarators and tokamaks.<\/jats:p>","DOI":"10.1088\/0029-5515\/52\/6\/063010","type":"journal-article","created":{"date-parts":[[2012,4,24]],"date-time":"2012-04-24T15:21:37Z","timestamp":1335280897000},"page":"063010","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":16,"title":["Dynamic transport regulation by zonal flow-like structures in the TJ-II stellarator"],"prefix":"10.1088","volume":"52","author":[{"given":"J.A.","family":"Alonso","sequence":"first","affiliation":[]},{"given":"C.","family":"Hidalgo","sequence":"additional","affiliation":[]},{"given":"M.A.","family":"Pedrosa","sequence":"additional","affiliation":[]},{"given":"B. 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