Vision of pellet injection experiments.

Lithium Pellet Injection Experiments

A pellet enhanced performance (PEP) mode, showing significantly reduced core transport, is regularly obtained after the injection of deeply penetrating lithium pellets into Alcator C-Mod discharges. These transient modes, which typically persist about two energy confinement times, are characterized by a steep pressure gradient (4, <a/5) in the inner third of the plasma, indicating the presence ...

Lithium Pellet Injection Experiments on the Alcator C-mod Tokamak Lithium Pellet Injection Experiments on the Alcator C-mod Tokamak Lithium Pellet Injection Experiments on the Alcator C-mod Tokamak

A pellet enhanced performance (PEP) mode, showing significantly reduced core transport, is regularly obtained after the injection of deeply penetrating lithium pellets into Alcator C-Mod discharges. These transient modes, which typically persist about two energy confinement times, are characterized by a steep pressure gradient (p <; a/5) in the inner third of the plasma, indicating the presence...

3D adaptive mesh refinement simulations of pellet injection in tokamaks

Injecting small pellets of frozen hydrogen is a proven method of fueling tokamaks but a quantitative theory of mass redistribution during inside/outside injection is still lacking. We present results of Adaptive Mesh Refinement (AMR) simulations that quantify the MHD processes responsible for mass redistribution. AMR is essential to provide the resolution required to simulate realistic pellet s...

Effect of Transport Processes on Tokamak Refueling by Pellet Injection

The Cit Pellet Injection System: Description and Supporting

The Compact Ignition Tokamak (CIT) will use an advanced, high-velocity pellet injection system to achieve and maintain ignited plasmas. Two pellet injectors are provided: a moderate-velocity (1 to 1 S-km/s), single-stage pneumatic injector with high reliability and a high-velocity (4to 5-km/s), two-stage pellet injector that uses frozen hydrogenic pellets encased in sabots. Both pellet injector...