Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Characterization of X-ray charge neutralizer using carbon-nanotube field
  emitter   An X-ray charge neutralizer using a screen-printed carbon-nanotube field
emitter is demonstrated to show the possibility of a large-area flat-panel
charge neutralizer, although the device dimensions in the present work are not
very large. The X-ray yields and spectra are characterized to estimate the ion
generation rate as one of the figures of merit of neutralizers. Charge
neutralization characteristics are measured and show good performance.

22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat