Resonant helical divertor

Peripheral Stochasticity in Tokamaks.The Martin-Taylor Revisited

“…The proposal of Karger, Lackner, and Feneberg [1,2] indicates island overlapping in the Tokamak peripheral region as the basic mechanism for generation of stochasticity. This region comprises the outer portion of the plasma column plus the vacuum scrapeoff layer between the material liiniier and ine vessel wall.…”

“…One of the various proposed techniques to reduce plasma-wall interactions in Tokamaks is the Ergodic Magnetic Limiter (EML) concept [1,2], The basic mechanism of EML action is the creation of a boundary layer of ergodic magnetic field *, in order to reduce the heat loading at the Tokamak inner wall. Recent experiments have shown a decrease of impurity level in the plasma core due to EML action [3].…”

Fractal structures in nonlinear plasma physics

“…near the tokamak wall) of chaotic magnetic field lines [22,23,47]. When this concept appeared, the word 'chaos' was not widely used by plasma physicists, and the word 'ergodic' was used instead.…”

“…This is the case, for example, of the plasma confined in a toroidal scheme (tokamak) with so-called ergodic limiters, which are external electric currents with the purpose of creating a peripheric region of chaotic field lines near the tokamak wall [18][19][20][21]. The interest in creating (rather than avoiding) a chaotic region of field lines is the obtaining of a 'cold' boundary layer so as to uniformize heat and particle loadings on the tokamak wall, thus improving the confinement quality through a reduction of impurity releasing [22,23]. Another example of practical application of chaotic field lines in the fusion context is the divertor concept, which needs a chaotic region to drive out undesirable particles from the plasma edge to a collector plate [24][25][26][27][28][29][30].…”

Transporte em sistemas hamiltonianos não-twist

“…A ideia do limitador magnético ergódico (LME) surgiu no final dos anos 70 [KL77,EF78]. O objetivo do LMEé criar uma região de campo caótico, na periferia da coluna de plasma, auxiliando no controle da interação entre o plasma e a parede do tokamak.…”