Author/Authors :
Maqueda، نويسنده , , R.J. and Maingi، نويسنده , , R. and Tritz، نويسنده , , K. and Lee، نويسنده , , K.C. and Bush، نويسنده , , C.E. and Fredrickson، نويسنده , , E.D. and Menard، نويسنده , , J.E. and Roquemore، نويسنده , , A.L. and Sabbagh، نويسنده , , S.A. and Zweben، نويسنده , , S.J.، نويسنده ,
Abstract :
The fast-evolving structure of MARFEs and ELMs is observed in the National Spherical Torus Experiment (NSTX) using a fast-framing camera. It is shown that Type V ELMs, the small ELM regime in NSTX, is characterized by a poloidally propagating ionization front close to the separatrix position. The ELMs also interact with the main chamber MARFE observed in NSTX coupling its movement and partial burn-through with that of the ELM cycle. During this cycle a toroidally localized MARFE precursor is seen propagating upward along field lines at speed of the order of 15 km/s. This interaction between ELM activity and MARFEs may be responsible for slow heat pulse propagation speeds seen in the divertor region.
Keywords :
Elm , MARFE , NSTX , Visible imaging
