Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Development of the poloidal Charge eXchange Recombination Spectroscopy
  system in Heliotron J   A Charge eXchange Recombination Spectroscopy (CXRS) system designed to
measure the poloidal rotation velocity is developed in Heliotron J. The
poloidal CXRS system measures the carbon emission line (C VI, n=8-7, 529.05nm)
and the Doppler shift of the emission line provides the information of plasma
rotation velocity. A high throughput photographic-lens monochromator (F/2.8)
with 0.73nm/mm dispersion is adopted to achieve high rotation velocity and
temporal resolution. Since two heating neutral beams from two tangential
injectors (NBI) are used as the diagnostic beams, a wide observation range
(0.26<r/a<0.92) is covered by 15 sightlines with a high spatial
resolution(d<r/a> < 0.06) at peripheral region (r/a>0.6). The system design and
the calibration method are presented. The initial results of poloidal rotation
measurement show an electron diamagnetic rotation in an NBI heated plasma,
while an ion diamagnetic rotation is observed when ECH is additionally applied.
The evaluated radial electric field profile shows a positive Er at plasma core
region in the ECH+NBI plasma, and a negative Er in the NBI heated plasma.

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The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
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The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
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The categories of this paper are: eess
30
The categories of this paper are: q-alg
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The categories of this paper are: quant-ph
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex