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VERSION:2.0
PRODID:-//Memento EPFL//
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SUMMARY:"Experimental investigation of filamentary current structures asso
 ciated with blobs in TORPEX plasmas"
DTSTART:20130318T103000
DTEND:20130318T113000
DTSTAMP:20260429T105039Z
UID:7df74684363a6b853d95eb5fcd2deb8d02bf112091d11032d936b1d1
CATEGORIES:Conferences - Seminars
DESCRIPTION:Fabio Rivaz\, étudiant EPFL (master)\nMany studies have shown
  that a big amount of the turbulent transport appearing in the SOL of plas
 ma devices is due to the emergence of filamentary coherent structures (blo
 bs) carrying particles toward the walls. To model the dynamic of this turb
 ulent phenomenon\, many closure schemes have been proposed. All the scheme
 s are derived by the fundamental equation of charge conservation ∇ ~ J =
  0.\nAssuming that the filaments of plasma are intercepted at their ends b
 y a perpendicular (referred to magnetic field lines) conducting limiter\, 
 the so-called "Sheath-limited model" is obtained\, which allows analyzing 
 the currents associated with blobs. From this model\, combined with some s
 imple approximations\, follows the vorticity equation. This equation state
 s an equilibrium between the four currents appearing in the blobs: the cur
 rent induced by the charged-particle drifts is compensated by the emergenc
 e of others three currents\, namely the ion polarization current\, the par
 allel current to the sheath and the current due to the friction between io
 ns and neutrals.\nPrevious experimental works have shown that in plasmas o
 f hydrogen the current induced by the charged-particle drifts is mainly co
 mpensated by the parallel current to the sheath. Thus\, the dynamic of blo
 bs is derived from the combination of this result with the assumption of a
  linear behavior of the filamentary current structures along the magnetic 
 field lines: the speed-versus-size scaling law equation is obtained\, whic
 h states a velocity of blobs proportional to a
LOCATION:PPB 019
STATUS:CONFIRMED
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