Ion collisionality and L--H transition in tokamaks

Journal Article · Mon Mar 01 04:00:00 EST 1993 · Physics of Fluids B; (United States)

DOI:https://doi.org/10.1063/1.860511· OSTI ID:6742653

Shaing, K C; Christenson, P J ^[1]

---

1. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)

When the previous H-mode theory [K. C. Shaing and E. C. Crume, Jr., Phys. Rev. Lett. [bold 63], 2369 (1989)] is extended to include a bi-Maxwellian ion distribution with both cold and hot ion components to model the effects of the non-Maxwellian distribution, the collisionality of the cold ions [nu][sub *[ital i]][sup [ital c]] becomes an irrelevant bifurcation parameter, as it is for the electrode-induced H mode. Thus, the observation that the L--H transition can occur even when [nu][sub *[ital i]][sup [ital c]][much gt]1 is consistent with the fundamental physics of the ion orbit loss model, including a hot ion component.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6742653
• Journal Information: Physics of Fluids B; (United States), Journal Name: Physics of Fluids B; (United States) Vol. 5:3; ISSN PFBPEI; ISSN 0899-8221
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700310 -- Plasma Confinement-- (1992-)
700330* -- Plasma Kinetics
Transport
& Impurities-- (1992-)
BANANA REGIME
CLOSED PLASMA DEVICES
COLLISIONS
DISTRIBUTION FUNCTIONS
FUNCTIONS
ION COLLISIONS
ION TEMPERATURE
PLATEAU REGIME
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TRANSPORT THEORY
TRAPPING
VISCOSITY