Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A normal-pressure MWPC for beam diagnostics at RIBLL2   A normal pressure MWPC for beam diagnostics at RIBLL2 has been developed,
which has a sensitive area of 80 mm$\times$80 mm and consists of three-layer
wire planes. The anode plane is designed with a wider frame to reduce the
discharge and without using protection wires. The detector has been tested with
a $^{55}$Fe X-ray source and a 200 MeV/u $^{12}$C beam from CSRm. A position
resolution better than 250 $\upmu$m along the anode wires and a detection
efficiency higher than 90% have been achieved.

14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex