The Isotope Effect on the L-mode Density Limit in JET H, D and T Divertor Plasmas
The first systematic study on the mass dependence of the L-mode density limit is reported for JET H, D and T divertor plasmas. The density limit, defined as the density at the onset of the X-point MARFE, is found to scale inversely with the ion mass in vertical target configurations, while no isotope effect is found in horizontal target configurations. 2D numerical simulations reproduce the observed mass dependance in vertical target discharges. The experiments indicate a coupling between the mass and power dependence of the L-mode density limit. The experimental results are compared with analytic models, which suggest that ion-neutral transverse collisionality plays a role in the density limit.
Bibliographic Reference: Article: The Isotope Effect on the L-mode Density Limit in JET H, D and T Divertor Plasmas, JET-P(98)43
Record Number: 199910792 / Last updated on: 1999-05-28
Original language: en
Available languages: en