1.
Confinement, transport & turbulence
Long-term
goal is to develop a predictive understanding of
transport in magnetized plasmas. Recent goals
include investigating the fundamental transport
physics issues and novel transport
ideas/experiments and providing a means to develop
new discoveries.
Confinement
and transport research work deal with electron and
ion thermal transport, particle &
impurity transport (including fast ion transport),
transport physics of edge and core barriers, etc.
1.1
New transport tools for the 2006 campaign
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ECRH with power up to 2 MW provides
independent control of power deposition at
different positions
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Improved supersonic molecular beam
injection (SMBI) fuelling allows deeply modulated
particle transport studies
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Improved diagnostics for zonal flow
fluctuations
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Edge density measurement by microwave
reflectometer with X-mode
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Multiple channel density measurement
1.2
Main topics are as follows
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H-mode physics with the ECRH (2MW) and LHCD (1MW)
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Zonal flow mechanism with GAM and near zero frequencies under
the conditions IP = 100 ~ 250
kA，BT = 1.5 ~ 2.6T，Ne = 0.8 ~ 4.0 ×
1019m
-3，qa = 3 ~ 6
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Thermal transport by modulated ECRH
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Particle transport controlled by SMBI (near liquid-nitrogen
temperature) or pellet injection.
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Impurity transport using
the LBO of Ti，Al，Mo.
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Optimization of density profile by pellet injection and MBI.
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High density close to
Greenwald limit using mixed fuelling
technique by GP
+ PI or GP + PI + MBI
2 MHD instabilities,
disruption & its mitigation
The
long-term objective of MHD stability research is
to establish the basis for understanding and
predicting limits to macroscopic stability of
toroidal plasmas. In addition to the more focused
researches, the role of the instability area is to
provide a broad range of good MHD stability
science, investigate instability control in
regimes relevant to ITER and other burning
plasmas, and explore stability physics in new
regimes. Main topics include
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Basic MHD physics
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Tearing mode physics (including
neoclassical tearing mode)
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Sawtooth physics & sawtooth
control
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Disruption physics & disruption
mitigation
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Edge pedestal stability
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Plasma control
Subtopics in 2006 focus on
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MHD stabilities in low q (q
< 3)
discharges
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Seed island suppression and sawteeth control by ECCD
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ELM features in H-mode discharge
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Control of fast current quench
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Disruption mitigation using the MBI of argon, impurity
injection by LBO
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Database for disruption prediction
3. Radio-frequency
heating & current drive
The
heating and current drive area comprises
experiments on the physics of electron cyclotron
heating and current drive, heating and current
drive at lower hybrid frequency, neutral beam
heating and current drive, and bootstrap current.
Recent topics are as follows.
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Optimization of heating and current drive for ECRF with 1~2 MW
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Current profile control by LHCD with 0.5
~ 1.0 MW
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Synergy of ECCD & LHCD
4. Boundary and divertor physics
The
boundary and divertor physics area is concerned
with the plasma physics from the pedestal plasma
to the interaction with the material walls at the
divertor plate and main chamber walls. In the
past, research was organized around Edge
Transport, Pumping and Radiative Divertor, and
Impurity Transport. Current topics are emphasized
on
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Wall conditioning using siliconization or boronization
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Local deposition of siliconization
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First mirror and its property
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Radiative and pumped divertor
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Zeff and impurity controls
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The comparison of divertor physics results with modeling
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