Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Development of a multi-pixel hybrid photo-detector with high quantum
  efficiency and gain   A hybrid photo-detector (HPD) consisting of a photocathode and a multi-pixel
avalanche diode (MP-AD) was developed a few years ago. Our previous studies
showed that its inherent potential for high resolution photon counting could be
further enhanced by reducing fluctuations in charge loss in the dead layer at
the entrance of the MP-AD. In this paper, we report on the improvement with the
newly developed HPD whose encapsulated MP-AD has a thinner dead layer than
before. It is demonstrated that the new HPD has much better energy resolution,
which enables clearer counting up to nine photoelectrons. Further enhancement
of the photocathode sensitivity of the HPD is also discussed.

30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ