Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A simulation study of a windowless gas stripping room in an E//B neutral
  particle analyzer   Neutral Particle Analyzer (NPA) is one of the crucial diagnostic devices on
Tokamak facilities. Stripping unit is one of the main parts of the NPA. A
windowless gas stripping room with two differential pipes is adopted in a
parallel direction of electric and magnetic fields (E//B) NPA. The pressure
distributions in the stripping chamber are simulated by Ansys Fluent together
with MolFlow+. Based on the pressure distributions extracted from the
simulation, the stripping efficiency of the E//B NPA is studied with GEANT4.
The hadron reaction physics is modified to track the charge state of each
particle in a cross section base method in GEANT4. The transmission rates ($R$)
and the stripping efficiencies $f_{+1}$ are examined for the particle energy
ranging from 20 to 200 keV at the input pressure ($P_0$) ranging from 20 to 400
Pa. According to the combined global efficiency, $R \times f_{+1}$, $P_0$ = 240
Pa is obtained as the optimum pressure for the maximum global efficiency in the
incident energy range investigated.

14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex