Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Development of a resonant laser ionization gas cell for high-energy,
  short-lived nuclei   A new laser ion source configuration based on resonant photoionization in a
gas cell has been developed at RIBF RIKEN. This system is intended for the
future PArasitic RI-beam production by Laser Ion-Source (PALIS) project which
will be installed at RIKEN's fragment separator, BigRIPS. A novel
implementation of differential pumping, in combination with a sextupole ion
beam guide (SPIG), has been developed. A few small scroll pumps create a
pressure difference from 1000 hPa - 10^-3 Pa within a geometry drastically
miniaturized compared to conventional systems. This system can utilize a large
exit hole for fast evacuation times, minimizing the decay loss for short-lived
nuclei during extraction from a buffer gas cell, while sufficient gas cell
pressure is maintained for stopping high energy RI-beams. In spite of the
motion in a dense pressure gradient, the photo-ionized ions inside the gas cell
are ejected with an assisting force gas jet and successfully transported to a
high-vacuum region via SPIG followed by a quadrupole mass separator. Observed
behaviors agree with the results of gas flow and Monte Carlo simulations.

33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph