Information Technology Reference
In-Depth Information
There are two kinds of resubmissions supported by the NGI_AEGIS DCI: deep
resubmission and shallow resubmission. The resubmission is deep when the job fails
after it has started running on the computation node, and shallow otherwise. Both
deep and shallow resubmissions are limited by default to
five attempts for AEGIS
CMPC SG jobs. Furthermore, even if after these
ve attempts (Q)SPEEDUP job
fails, it will not affect the results, since they are obtained using a large number of
independent jobs. For GP-SCL jobs this is not the case, and results will not be
produced if the workflow node fails. This could be overseen by an additional module
that monitors relations between con
gurations and corresponding results, and per-
forms complete workflow resubmissions when necessary.
In this period, AEGIS CMPC SG was mainly used for:
Study of Faraday waves in binary nonmiscible Bose
Einstein condensates
-
(Balaz 2012-2);
Study of Faraday waves in single-component Bose
Einstein condensates with
spatially inhomogeneous atomic interactions (Balaz 2014), as well as conden-
sates with dipolar interactions (Nikolic 2013);
-
Study of fragmentation of a Bose
Einstein condensate through periodic mod-
ulation of the scattering length (Vidan 2011);
-
Study of geometric resonances in Bose
-
Einstein condensates with two- and
three-body interactions (Jibbouri 2013).
Using the numerical results obtained via the AEGIS CMPC SG and analytical
variational calculations, it was shown that elongated binary nonmiscible Bose
-
Einstein condensates subject
nement
exhibit a Faraday instability, similar to that seen in one-component condensates.
Modulation of the radial con
to periodic modulation of the radial con
nement leads to the emergence of density waves in
the longitudinal direction. Considering two hyper
ne states of rubidium conden-
sates, AEGIS CMPC GP-SCL application was able to calculate two experimentally
relevant stationary-state con
gurations: one in which the components form a dark-
bright symbiotic pair (the ground state of the system), and one in which the
components are segregated (
gura-
tions, it was shown numerically that far from resonances, the Faraday waves excited
in the two components are of similar periods, emerge simultaneously, and do not
impact the dynamics of the bulk of the condensate. This numerical result was
con
(first excited state). For each of these two con
rmed analytically, and it was shown that the period of the Faraday waves can
be estimated using a variational treatment of the coupled Gross
Pitaevskii equa-
tions combined with a Mathieu-type analysis for the selection mechanism of the
excited waves.
Numerical study of Faraday waves in systems with spatially inhomogeneous
atomic interactions has revealed that in the regime of weak inhomogeneity, the
system practically behaves as in the homogeneous case. However, for the case of
strong inhomogeneity, the properties of density waves substantially depend on the
typical inhomogeneity scale. For systems with dipolar interaction, the stability of
the ground state was found to be the major issue. Only for smaller numbers of
atoms (up to several tens of thousands) is the system stable enough to support the
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