Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Calibration of photomultiplier using UVLED   Detector calibration is very important for the long-term operation. For the
purposes of simple and precise calibration, we developed a new portable
calibration source using UVLED to calibrate the fluorescence detector of the
Telescope Array experiment (TA). The UVLED is light (less than 1 kg) and its
setup is quick and easy. Therefore, a single source will be used instead of the
calibration sources that TA currently uses. The UVLED emits 369 nm wavelength
and ~70 pJ of photons which are calibrated with 5% accuracy us-ing photo-diode.
It has a particular unit, which is an internal heater, to keep the temperature
constant and avoiding temperature dependency on light yield. The first result
of calibration for 24 detectors is xx pho-tons/faced count for 369 nm photons
with 6% uncertainty. It is in agreement with the result of the current
calibration sources of TA.

28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph