Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Rapid generation of all-optical $^{39}$K Bose-Einstein condensates using
  a low-field Feshbach resonance   Ultracold potassium is a promising candidate for quantum technology
applications and fundamental research as it allows controlling intra-atomic
interactions via low-field magnetic Feshbach resonances. However, the
realization of high-flux sources of Bose-Einstein condensates remains
challenging due to the necessity of optical trapping to use magnetic fields as
external degree of freedom. We investigate the production of all-optical
$^{39}$K Bose-Einstein condensates with different scattering lengths using a
Feshbach resonance near $33$ G. By tuning the scattering length in a range
between $75\, a_0$ and $300\, a_0$ we demonstrate a trade off between
evaporation speed and final atom number and decrease our evaporation time by a
factor of $5$ while approximately doubling the evaporation flux. To this end,
we are able to produce fully condensed ensembles with $5\times10^4$ atoms
within $850$ ms evaporation time at a scattering length of $232\, a_0$ and
$1.6\times10^5$ atoms within $4$ s at $158\, a_0$, respectively. We deploy a
numerical model to analyse the flux and atom number scaling with respect to
scattering length, identify current limitations and simulate the optimal
performance of our setup. Based on our findings we describe routes towards
high-flux sources of ultra-cold potassium for inertial sensing.

23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys