Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experimental single-impulse magnetic focusing of launched cold atoms   Single-impulse three-dimensional magnetic focusing of vertically launched
cold atoms has been observed. Four different configurations of the lens were
used to vary the relative radial and axial focusing properties. Compact focused
clouds of 85Rb were seen for all four configurations. It is shown that an
atom-optical ray matrix approach for describing the lensing action is
insufficient. Numerical simulation using a full approximation to the lens's
magnetic field shows very good agreement with the radial focusing properties of
the lens. However, the axial (vertical direction) focusing properties are less
well described and the reasons for this are discussed.

7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio