Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A 3D-printed alkali metal dispenser   We demonstrate and characterize a source of Li atoms made from direct metal
laser sintered titanium. The source's outgassing rate is measured to be $5
\,(2)\cdot 10^{-7}$\,$\rm{Pa}~ \rm{L}~ \rm{s}^{-1}$ at a temperature
$T=330\,^\circ$C, which optimizes the number of atoms loaded into a
magneto-optical trap. The source loads $\approx 10^7$ $^7$Li atoms in the trap
in $\approx 1$\,s. The loaded source weighs 700\,mg and is suitable for a
number of deployable sensors based on cold atoms.

33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc