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Hayashi, Nobuhiko; Takizuka, Tomonori; Hosokawa, Masanari*; Shimizu, Katsuhiro
Journal of Nuclear Materials, 313-316(1-3), p.1041 - 1045, 2003/03
Times Cited Count：3 Percentile：25.33(Materials Science, Multidisciplinary)Asymmetric equilibria of divertor plasmas influenced by the thermoelectric potential and the momentum loss due to the charge-exchange have been studied by using the five-point model. The momentum loss becomes large when the divertor plasma temperature decreases below about 10 eV. The pre-sheath potential is increased by the momentum loss and compensates for the decrease in the thermoelectric potential at the low-temperature side of the asymmetric equilibrium. Through The change of the pre-sheath potential, the momentum loss has a stabilizing effect on the thermoelectric instability and mitigates the asymmetry. To lower the temperature by the recycling at the one-side divertor, the high recycling and the resultant momentum loss at the other-side divertor are effective because of the bifurcated structure of the equilibrium.
Takizuka, Tomonori; Hojo, Hitoshi*; Hatori, Tadatsugu*
Purazuma, Kaku Yugo Gakkai-Shi, 78(9), p.857 - 912, 2002/09
Transport along field lines in magnetic confinement plasmas is reviewed. Collisionless and collisional-diffusive transports are discussed. Because of their fast transport, features of plasmas along field lines are apt to behave nonlocally. A nonlocal phenomenon of scrape-off layer (SOL) and divertor plasmas in a tokamak is introduced, whose asymmetry along field lines is induced by the thermoelectric instability related to the SOL current. A local phenomenon called MARFE can be brought by the strong radiation cooling. The "snake" with nonlocal feature along field lines but with local structure perpendicular to the field is observed in a tokamak core plasma. For mirror-confined plasmas, axial particle losses from the mirror ends, especially pitch-angle-sattering losses into the loss cone and nondiabatic losses due to the breakdown of adiabaticity of the magnetic moment, are also discussed in the relation to nonlocal axial transport.
Hayashi, Nobuhiko; Takizuka, Tomonori; Shimizu, Katsuhiro
Contributions to Plasma Physics, 40(3-4), p.387 - 392, 2000/11
Times Cited Count：2 Percentile：7.86(Physics, Fluids & Plasmas)no abstracts in English
; Takizuka, Tomonori; Hatayama, Akiyoshi*;
Journal of Nuclear Materials, 266-269, p.526 - 531, 1999/00
Times Cited Count：4 Percentile：34.36(Materials Science, Multidisciplinary)no abstracts in English
; Takizuka, Tomonori; Hatayama, Akiyoshi*;
Journal of the Physical Society of Japan, 66(12), p.3815 - 3825, 1997/12
Times Cited Count：5 Percentile：47.20(Physics, Multidisciplinary)no abstracts in English
