A Reduced Model of ELM Mitigation by SMBI and
Pellet Injection
1
ELM dynamics in the
CA model
ELM mitigation by SMBI
Type-II/III
Type-I
(𝒋)
 Tri-unstable cellular automata(CA) model is
developed to study the dynamics of H-mode
pedestal, ELMs, and their control.
 CA model reproduce H-mode pedestals with
various types of ELMs.
 SMBI
 SMBI increases the pedestal transport
by inducing frequent small scale
transport avalanches, which prevent
the pedestal from building-up to
profiles to trigger global peelingballooning instabilities.
 Global type-I ELMs are replaced by
smaller type-II or type-III ELMs.
 Shallower injections are better for the
ELM mitigation.
 Pellet Injection
 Pellet injection can force to trigger
large scale ELMs and discharge of
overall pedestal pressure, and thus
lead to pellet pacing of ELMs.
 Deeper injections are better for the
pellet pacing.
SMBI pulse train
(𝛁𝑷)
Triggered ELM
dynamics
Pellet pacing
Pellet
Injections