Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Universality of the ion flux to the JET outer wall   Universality in the ion flux to the JET outer-wall is observed in outerwall
limiter mounted Langmuir probe (OLP) time-series across a large range of plasma
current and line-averaged density during Ohmically heated horizontal target
L-mode plasmas. The mean, M, and the standard deviation, sigma, of the
ion-saturation current measured by the OLP show systematic variation with
plasma current and density. Both increase as either plasma current decreases
and/or density increases. Upon renormalization, achieved by subtraction of M
and rescaling by sigma, the probability distribution functions (PDFs) of each
signal collapse approximately onto a single curve. The shape of the curve
deviates from a distribution in the tail of the PDF and is better described by
a log-normal distribution. The collapse occurs over 4 decades of the ordinate
which, given the wide parameter space over which the data spans, is a strong
indication of universality.

16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas