Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Impact of nitrogen seeding on confinement and power load control of a
  high-triangularity JET ELMy H-mode plasma with a metal wall   This paper reports the impact on confinement and power load of the high-shape
2.5MA ELMy H-mode scenario at JET of a change from an all carbon plasma facing
components to an all metal wall. In preparation to this change, systematic
studies of power load reduction and impact on confinement as a result of
fuelling in combination with nitrogen seeding were carried out in JET-C and are
compared to their counterpart in JET with a metallic wall. An unexpected and
significant change is reported on the decrease of the pedestal confinement but
is partially recovered with the injection of nitrogen.

12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con