TY - JOUR
T1 - Consequences of time-reversal symmetry for the electric field scaling of transport in stellarators
AU - Hirshman, S. P.
AU - Shaing, K. C.
AU - Van Rij, W. I.
PY - 1986/1/1
Y1 - 1986/1/1
N2 - Most three-dimensional fusion-plasma-confinement geometries possess symmetric magnetic fields satisfying B(,)=B(-,-), where and are poloidal and toroidal flux coordinate angles, respectively. For such configurations with large aspect ratios, the time-reversal symmetry of the collisionless orbits is sufficient to prove that the local diffusion coefficient, D(Er), is independent of the sign of the radial electric field, Er. Consequences of this property for neutral-beam injection and for generic root-jumping models for stellarators are discussed.
AB - Most three-dimensional fusion-plasma-confinement geometries possess symmetric magnetic fields satisfying B(,)=B(-,-), where and are poloidal and toroidal flux coordinate angles, respectively. For such configurations with large aspect ratios, the time-reversal symmetry of the collisionless orbits is sufficient to prove that the local diffusion coefficient, D(Er), is independent of the sign of the radial electric field, Er. Consequences of this property for neutral-beam injection and for generic root-jumping models for stellarators are discussed.
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U2 - 10.1103/PhysRevLett.56.1697
DO - 10.1103/PhysRevLett.56.1697
M3 - Article
AN - SCOPUS:5844260806
SN - 0031-9007
VL - 56
SP - 1697
EP - 1699
JO - Physical review letters
JF - Physical review letters
IS - 16
ER -