Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Advanced scenarios for ITER operation   An international experiment, ITER is proposed as the next essential and
critical step on the path to demonstrating the scientific and technological
feasibility of fusion energy. ITER would give unique opportunities to explore,
in reactor relevant conditions, the physics of &#945;-particle heating, plasma
turbulence and turbulent transport, stability limits to the plasma pressure and
exhaust of power and particles. Improved understanding of the physical
processes occurring in tokamak plasmas give enhanced confidence in ITER
achieving its goals. In particular, progress has been made in research to raise
the performance of tokamaks, aimed to extend the discharge pulse length towards
steady-state operation (advanced scenarios). Advanced scenarios use a modified
current density profile, ranging from (i) plasmas that sustain a central region
with a flat current density profile (zero magnetic shear), capable of operating
stationary at high plasma pressure, to (ii) discharges with an off axis maximum
of the current density profile (reversed magnetic shear in the core), able to
form internal transport barriers, to increase the confinement of the plasma.
The physics of advanced tokamak discharges is described, together with an
overview of recent results from different tokamak experiments.

21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin