The ALADDIN project aims at detecting warm dust populations around
nearby main sequence stars. In order to achieve the significantly
improved sensitivity with respect to existing instruments,
the architecture of the system is focused and optimised for the mission:
ALADDIN implements the nulling interferometry technique at the focal plane of
a 2-telescope interferometer mounted on a rotating structural beam.
Concerning the beam combining nulling instrument, the ALADDIN design is inherited
from a Definition Study of the VLTI/GENIE instrument. In this paper, we demonstrate
how the ALADDIN instrument preliminary definition can be made simpler and more
representative of a space instrument than GENIE thanks to both the outstanding
atmospheric properties of Dome C and the dedicated architecture of the system.
Finally, we discuss the compatibility of the instrument with the Antarctic
environment and constraints, and underline the experimental and industrial know-how
learnt from the MAII and PERSEE nulling breadboards in which our Team is also
involved.