Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The 2nd Generation VLTI path to performance   The upgrade of the VLTI infrastructure for the 2nd generation instruments is
now complete with the transformation of the laboratory, and installation of
star separators on both the 1.8-m Auxiliary Telescopes (ATs) and the 8-m Unit
Telescopes (UTs). The Gravity fringe tracker has had a full semester of
commissioning on the ATs, and a first look at the UTs. The CIAO infrared
wavefront sensor is about to demonstrate its performance relative to the
visible wavefront sensor MACAO. First astrometric measurements on the ATs and
astrometric qualification of the UTs are on-going. Now is a good time to
revisit the performance roadmap for VLTI that was initiated in 2014, which
aimed at coherently driving the developments of the interferometer, and
especially its performance, in support to the new generation of instruments:
Gravity and MATISSE.

10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas