Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experimental Determination of the Gain Distribution of an Avalanche
  Photodiode at Low Gains   A measurement system for determining the gain distributions of avalanche
photodiodes (APDs) in a low gain range is presented. The system is based on an
ultralow-noise charge--sensitive amplifier and detects the output carriers from
an APD. The noise of the charge--sensitive amplifier is as low as 4.2 electrons
at a sampling rate of 200 Hz. The gain distribution of a commercial Si APD with
low average gains are presented, demonstrating the McIntyre theory in the low
gain range.

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The categories of this paper are: cs
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
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The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
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The categories of this paper are: adap-org
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The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an